{"pageNumber":"20","pageRowStart":"475","pageSize":"25","recordCount":1766,"records":[{"id":70034490,"text":"70034490 - 2011 - History of plains resurfacing in the Scandia region of Mars","interactions":[],"lastModifiedDate":"2018-12-05T08:32:29","indexId":"70034490","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3083,"text":"Planetary and Space Science","active":true,"publicationSubtype":{"id":10}},"title":"History of plains resurfacing in the Scandia region of Mars","docAbstract":"We present a preliminary photogeologic map of the Scandia region of Mars with the objective of reconstructing its resurfacing history. The Scandia region includes the lower section of the regional lowland slope of Vastitas Borealis extending about 500–1800 km away from Alba Mons into the Scandia sub-basin below −4800 m elevation. Twenty mapped geologic units express the diverse stratigraphy of the region. We particularly focus on the materials making up the Vastitas Borealis plains and its Scandia sub-region, where erosional processes have obscured stratigraphic relations and made the reconstruction of the resurfacing history particularly challenging. Geologic mapping implicates the deposition, erosion, and deformation/degradation of geologic units predominantly during Late Hesperian and Early Amazonian time (~3.6–3.3 Ga). During this time, Alba Mons was active, outflow channels were debouching sediments into the northern plains, and basal ice layers of the north polar plateau were accumulating. We identify zones of regional tectonic contraction and extension as well as gradation and mantling. Depressions and scarps within these zones indicate collapse and gradation of Scandia outcrops and surfaces at scales of meters to hundreds of meters. We find that Scandia Tholi display concentric ridges, rugged peaks, irregular depressions, and moats that suggest uplift and tilting of layered plains material by diapirs and extrusion, erosion, and deflation of viscous, sedimentary slurries as previously suggested. These appear to be long-lived features that both pre-date and post-date impact craters. Mesa-forming features may have similar origins and occur along the southern margin of the Scandia region, including near the Phoenix Mars Lander site. Distinctive lobate materials associated with local impact craters suggest impact-induced mobilization of surface materials. We suggest that the formation of the Scandia region features potentially resulted from crustal heating related to Alba Mons volcanism, which acted upon a sequence of lavas, outflow channel sediments, and polar ice deposits centered within the Scandia region. These volatile-enriched sediments may have been in a state of partial volatile melt, resulting in the mobilization of deeply buried ancient materials and their ascent and emergence as sediment and mud breccia diapirs to form tholi features. Similar subsurface instabilities proximal to Alba Mons may have led to surface disruption, as suggested by local and regional scarps, mesas, moats, and knob fields.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Planetary and Space Science","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Elsevier","doi":"10.1016/j.pss.2010.11.004","issn":"00320633","usgsCitation":"Tanaka, K.L., Fortezzo, C.M., Hayward, R., Rodriguez, J.A., and Skinner, J., 2011, History of plains resurfacing in the Scandia region of Mars: Planetary and Space Science, v. 59, no. 11-12, p. 1128-1142, https://doi.org/10.1016/j.pss.2010.11.004.","productDescription":"15 p.","startPage":"1128","endPage":"1142","numberOfPages":"15","costCenters":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"links":[{"id":243840,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"otherGeospatial":"Mars; Scandia region","volume":"59","issue":"11-12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a31c0e4b0c8380cd5e1d1","contributors":{"authors":[{"text":"Tanaka, Kenneth L. ktanaka@usgs.gov","contributorId":610,"corporation":false,"usgs":true,"family":"Tanaka","given":"Kenneth","email":"ktanaka@usgs.gov","middleInitial":"L.","affiliations":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"preferred":true,"id":446056,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fortezzo, Corey M. 0000-0001-8188-5530 cfortezzo@usgs.gov","orcid":"https://orcid.org/0000-0001-8188-5530","contributorId":25383,"corporation":false,"usgs":true,"family":"Fortezzo","given":"Corey","email":"cfortezzo@usgs.gov","middleInitial":"M.","affiliations":[{"id":130,"text":"Astrogeology Research Center","active":false,"usgs":true}],"preferred":false,"id":446058,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hayward, Rosalyn K.","contributorId":90955,"corporation":false,"usgs":true,"family":"Hayward","given":"Rosalyn K.","affiliations":[],"preferred":false,"id":446060,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rodriguez, J. Alexis P.","contributorId":84181,"corporation":false,"usgs":true,"family":"Rodriguez","given":"J.","email":"","middleInitial":"Alexis P.","affiliations":[],"preferred":false,"id":446059,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Skinner, James A. 0000-0002-3644-7010 jskinner@usgs.gov","orcid":"https://orcid.org/0000-0002-3644-7010","contributorId":3187,"corporation":false,"usgs":true,"family":"Skinner","given":"James A.","email":"jskinner@usgs.gov","affiliations":[{"id":131,"text":"Astrogeology Science Center","active":true,"usgs":true}],"preferred":true,"id":446057,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70034361,"text":"70034361 - 2011 - Loss of volatile hydrocarbons from an LNAPL oil source","interactions":[],"lastModifiedDate":"2020-01-14T15:31:19","indexId":"70034361","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2233,"text":"Journal of Contaminant Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Loss of volatile hydrocarbons from an LNAPL oil source","docAbstract":"The light nonaqueous phase liquid (LNAPL) oil pool in an aquifer that resulted from a pipeline spill near Bemidji, Minnesota, was analyzed for volatile hydrocarbons (VHCs) to determine if the composition of the oil remains constant over time. Oil samples were obtained from wells at five locations in the oil pool in an anaerobic part of the glacial outwash aquifer. Samples covering a 21-year period were analyzed for 25 VHCs. Compared to the composition of oil from the pipeline source, VHCs identified in oil from wells sampled in 2008 were 13 to 64% depleted. The magnitude of loss for the VHCs analyzed was toluene ≫ o-xylene, benzene, C6 and C10–12n-alkanes > C7–C9n-alkanes > m-xylene, cyclohexane, and 1- and 2-methylnaphthalene > 1,2,4-trimethylbenzene and ethylbenzene. Other VHCs including p-xylene, 1,3,5- and 1,2,3-trimethylbenzenes, the tetramethylbenzenes, methyl- and ethyl-cyclohexane, and naphthalene were not depleted during the time of the study. Water–oil and air–water batch equilibration simulations indicate that volatilization and biodegradation is most important for the C6–C9n-alkanes and cyclohexanes; dissolution and biodegradation is important for most of the other hydrocarbons. Depletion of the hydrocarbons in the oil pool is controlled by: the lack of oxygen and nutrients, differing rates of recharge, and the spatial distribution of oil in the aquifer. The mass loss of these VHCs in the 5 wells is between 1.6 and 7.4% in 29 years or an average annual loss of 0.06–0.26%/year. The present study shows that the composition of LNAPL changes over time and that these changes are spatially variable. This highlights the importance of characterizing the temporal and spatial variabilities of the source term in solute-transport models.","language":"English","publisher":"Elsevier","doi":"10.1016/j.jconhyd.2011.06.006","issn":"01697722","usgsCitation":"Baedecker, M.J., Eganhouse, R., Bekins, B.A., and Delin, G.N., 2011, Loss of volatile hydrocarbons from an LNAPL oil source: Journal of Contaminant Hydrology, v. 126, no. 3-4, p. 140-152, https://doi.org/10.1016/j.jconhyd.2011.06.006.","productDescription":"13 p.","startPage":"140","endPage":"152","costCenters":[{"id":146,"text":"Branch of Regional Research-Eastern Region","active":false,"usgs":true},{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":244785,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Minnesota","city":"Bemidji","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -95.0373,47.3762 ], [ -95.0373,47.6177 ], [ -94.6844,47.6177 ], [ -94.6844,47.3762 ], [ -95.0373,47.3762 ] ] ] } } ] }","volume":"126","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a49dee4b0c8380cd68956","contributors":{"authors":[{"text":"Baedecker, Mary Jo 0000-0002-4865-1043 mjbaedec@usgs.gov","orcid":"https://orcid.org/0000-0002-4865-1043","contributorId":197793,"corporation":false,"usgs":true,"family":"Baedecker","given":"Mary","email":"mjbaedec@usgs.gov","middleInitial":"Jo","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":779430,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Eganhouse, Robert P. eganhous@usgs.gov","contributorId":2031,"corporation":false,"usgs":true,"family":"Eganhouse","given":"Robert P.","email":"eganhous@usgs.gov","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":779431,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bekins, Barbara A. 0000-0002-1411-6018 babekins@usgs.gov","orcid":"https://orcid.org/0000-0002-1411-6018","contributorId":1348,"corporation":false,"usgs":true,"family":"Bekins","given":"Barbara","email":"babekins@usgs.gov","middleInitial":"A.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true},{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":779432,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Delin, Geoffrey N. 0000-0001-7991-6158 delin@usgs.gov","orcid":"https://orcid.org/0000-0001-7991-6158","contributorId":2610,"corporation":false,"usgs":true,"family":"Delin","given":"Geoffrey","email":"delin@usgs.gov","middleInitial":"N.","affiliations":[{"id":5063,"text":"Central Water Science Field Team","active":true,"usgs":true}],"preferred":true,"id":779433,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70034363,"text":"70034363 - 2011 - Chemical structures of coal lithotypes before and after CO2 adsorption as investigated by advanced solid-state 13C nuclear magnetic resonance spectroscopy","interactions":[],"lastModifiedDate":"2021-04-21T20:27:00.964393","indexId":"70034363","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2033,"text":"International Journal of Coal Geology","active":true,"publicationSubtype":{"id":10}},"title":"Chemical structures of coal lithotypes before and after CO2 adsorption as investigated by advanced solid-state 13C nuclear magnetic resonance spectroscopy","docAbstract":"

Four lithotypes (vitrain, bright clarain, clarain, and fusain) of a high volatile bituminous Springfield Coal from the Illinois Basin were characterized using advanced solid-state 13C nuclear magnetic resonance (NMR) spectroscopy. The NMR techniques included quantitative direct polarization/magic angle spinning (DP/MAS), cross polarization/total sideband suppression (CP/TOSS), dipolar dephasing, CHn selection, and recoupled C–H long-range dipolar dephasing techniques. The lithotypes that experienced high-pressure CO2 adsorption isotherm analysis were also analyzed to determine possible changes in coal structure as a result of CO2 saturation at high pressure and subsequent evacuation. The main carbon functionalities present in original vitrain, bright clarain, clarain and fusain were aromatic carbons (65.9%–86.1%), nonpolar alkyl groups (9.0%–28.9%), and aromatic C–O carbons (4.1%–9.5%). Among these lithotypes, aromaticity increased in the order of clarain, bright clarain, vitrain, and fusain, whereas the fraction of alkyl carbons decreased in the same order. Fusain was distinct from other three lithotypes in respect to its highest aromatic composition (86.1%) and remarkably small fraction of alkyl carbons (11.0%). The aromatic cluster size in fusain was larger than that in bright clarain. The lithotypes studied responded differently to high pressure CO2 saturation. After exposure to high pressure CO2, vitrain and fusain showed a decrease in aromaticity but an increase in the fraction of alkyl carbons, whereas bright clarain and clarain displayed an increase in aromaticity but a decrease in the fraction of alkyl carbons. Aromatic fused-rings were larger for bright clarain but smaller for fusain in the post-CO2 adsorption samples compared to the original lithotypes. These observations suggested chemical CO2–coal interactions at high pressure and the selectivity of lithotypes in response to CO2 adsorption.

","language":"English","publisher":"Elsevier","doi":"10.1016/j.coal.2011.08.003","issn":"01665162","usgsCitation":"Cao, X., Mastalerz, M., Chappell, M., Miller, L., Li, Y., and Mao, J., 2011, Chemical structures of coal lithotypes before and after CO2 adsorption as investigated by advanced solid-state 13C nuclear magnetic resonance spectroscopy: International Journal of Coal Geology, v. 88, no. 1, p. 67-74, https://doi.org/10.1016/j.coal.2011.08.003.","productDescription":"8 p.","startPage":"67","endPage":"74","costCenters":[],"links":[{"id":244819,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":216918,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.coal.2011.08.003"}],"volume":"88","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f596e4b0c8380cd4c2d7","contributors":{"authors":[{"text":"Cao, X.","contributorId":60885,"corporation":false,"usgs":true,"family":"Cao","given":"X.","email":"","affiliations":[],"preferred":false,"id":445419,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mastalerz, Maria","contributorId":78065,"corporation":false,"usgs":true,"family":"Mastalerz","given":"Maria","affiliations":[],"preferred":false,"id":445420,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Chappell, M.A.","contributorId":47592,"corporation":false,"usgs":true,"family":"Chappell","given":"M.A.","email":"","affiliations":[],"preferred":false,"id":445418,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Miller, L.F.","contributorId":85012,"corporation":false,"usgs":true,"family":"Miller","given":"L.F.","email":"","affiliations":[],"preferred":false,"id":445421,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Li, Y.","contributorId":41394,"corporation":false,"usgs":true,"family":"Li","given":"Y.","affiliations":[],"preferred":false,"id":445417,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Mao, J.","contributorId":87513,"corporation":false,"usgs":true,"family":"Mao","given":"J.","email":"","affiliations":[],"preferred":false,"id":445422,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70036897,"text":"70036897 - 2011 - Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers","interactions":[],"lastModifiedDate":"2013-05-28T10:36:53","indexId":"70036897","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1213,"text":"Chemical Geology","active":true,"publicationSubtype":{"id":10}},"title":"Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers","docAbstract":"Most geochemical variability in MOR basalts is consistent with low- to moderate-pressure fractional crystallization of various mantle-derived parental melts. However, our geochemical data from MOR high-silica glasses, including new volatile and oxygen isotope data, suggest that assimilation of altered crustal material plays a significant role in the petrogenesis of dacites and may be important in the formation of basaltic lavas at MOR in general. MOR high-silica andesites and dacites from diverse areas show remarkably similar major element trends, incompatible trace element enrichments, and isotopic signatures suggesting similar processes control their chemistry. In particular, very high Cl and elevated H2O concentrations and relatively light oxygen isotope ratios (~ 5.8‰ vs. expected values of ~ 6.8‰) in fresh dacite glasses can be explained by contamination of magmas from a component of ocean crust altered by hydrothermal fluids. Crystallization of silicate phases and Fe-oxides causes an increase in δ18O in residual magma, but assimilation of material initially altered at high temperatures results in lower δ18O values. The observed geochemical signatures can be explained by extreme fractional crystallization of a MOR basalt parent combined with partial melting and assimilation (AFC) of amphibole-bearing altered oceanic crust. The MOR dacitic lavas do not appear to be simply the extrusive equivalent of oceanic plagiogranites. The combination of partial melting and assimilation produces a distinct geochemical signature that includes higher incompatible trace element abundances and distinct trace element ratios relative to those observed in plagiogranites.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Chemical Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.chemgeo.2011.05.017","issn":"00092541","usgsCitation":"Wanless, V., Perfit, M., Ridley, W., Wallace, P., Grimes, C.B., and Klein, E., 2011, Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers: Chemical Geology, v. 287, no. 1-2, p. 54-65, https://doi.org/10.1016/j.chemgeo.2011.05.017.","startPage":"54","endPage":"65","numberOfPages":"12","costCenters":[{"id":548,"text":"Rocky Mountain Mapping Center","active":false,"usgs":true}],"links":[{"id":487873,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://hdl.handle.net/10161/9357","text":"External Repository"},{"id":217801,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.chemgeo.2011.05.017"},{"id":245773,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","volume":"287","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bc2bee4b08c986b32ad23","contributors":{"authors":[{"text":"Wanless, V.D.","contributorId":30487,"corporation":false,"usgs":true,"family":"Wanless","given":"V.D.","email":"","affiliations":[],"preferred":false,"id":458387,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Perfit, M.R.","contributorId":45467,"corporation":false,"usgs":true,"family":"Perfit","given":"M.R.","email":"","affiliations":[],"preferred":false,"id":458388,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ridley, W.I.","contributorId":72122,"corporation":false,"usgs":true,"family":"Ridley","given":"W.I.","email":"","affiliations":[],"preferred":false,"id":458390,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wallace, P.J.","contributorId":6606,"corporation":false,"usgs":true,"family":"Wallace","given":"P.J.","email":"","affiliations":[],"preferred":false,"id":458385,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Grimes, Craig B.","contributorId":68261,"corporation":false,"usgs":true,"family":"Grimes","given":"Craig","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":458389,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Klein, E.M.","contributorId":20156,"corporation":false,"usgs":true,"family":"Klein","given":"E.M.","email":"","affiliations":[],"preferred":false,"id":458386,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70036519,"text":"70036519 - 2011 - Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica","interactions":[],"lastModifiedDate":"2021-01-07T17:16:07.029115","indexId":"70036519","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1427,"text":"Earth and Planetary Science Letters","active":true,"publicationSubtype":{"id":10}},"title":"Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica","docAbstract":"

Continental intraplate volcanoes, such as Erebus volcano, Antarctica, are associated with extensional tectonics, mantle upwelling and high heat flow. Typically, erupted magmas are alkaline and rich in volatiles (especially CO2), inherited from low degrees of partial melting of mantle sources. We examine the degassing of the magmatic system at Erebus volcano using melt inclusion data and high temporal resolution open-path Fourier transform infrared (FTIR) spectroscopic measurements of gas emissions from the active lava lake. Remarkably different gas signatures are associated with passive and explosive gas emissions, representative of volatile contents and redox conditions that reveal contrasting shallow and deep degassing sources. We show that this unexpected degassing signature provides a unique probe for magma differentiation and transfer of CO2-rich oxidised fluids from the mantle to the surface, and evaluate how these processes operate in time and space. Extensive crystallisation driven by CO2 fluxing is responsible for isobaric fractionation of parental basanite magmas close to their source depth. Magma deeper than 4 kbar equilibrates under vapour-buffered conditions. At shallower depths, CO2-rich fluids accumulate and are then released either via convection-driven, open-system gas loss or as closed-system slugs that ascend and result in Strombolian eruptions in the lava lake. The open-system gases have a reduced state (below the QFM buffer) whereas the closed-system gases preserve their deep oxidised signatures (close to the NNO buffer).

","language":"English","publisher":"Elsevier","doi":"10.1016/j.epsl.2011.04.005","issn":"0012821X","usgsCitation":"Oppenheimer, C., Moretti, R., Kyle, P., Eschenbacher, A., Lowenstern, J.B., Hervig, R., and Dunbar, N.W., 2011, Mantle to surface degassing of alkalic magmas at Erebus volcano, Antarctica: Earth and Planetary Science Letters, v. 306, no. 3-4, p. 261-271, https://doi.org/10.1016/j.epsl.2011.04.005.","productDescription":"11 p.","startPage":"261","endPage":"271","costCenters":[],"links":[{"id":475291,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://insu.hal.science/insu-00707142","text":"External Repository"},{"id":245625,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":217668,"rank":9999,"type":{"id":10,"text":"Digital Object 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jlwnstrn@usgs.gov","orcid":"https://orcid.org/0000-0003-0464-7779","contributorId":2755,"corporation":false,"usgs":true,"family":"Lowenstern","given":"Jacob","email":"jlwnstrn@usgs.gov","middleInitial":"B.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":456521,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hervig, R.L.","contributorId":98108,"corporation":false,"usgs":true,"family":"Hervig","given":"R.L.","email":"","affiliations":[],"preferred":false,"id":456527,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Dunbar, N. W.","contributorId":72978,"corporation":false,"usgs":true,"family":"Dunbar","given":"N.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":456525,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70036696,"text":"70036696 - 2011 - Pigeonholing pyroclasts: Insights from the 19 March 2008 explosive eruption of Kīlauea volcano","interactions":[],"lastModifiedDate":"2020-12-23T19:02:35.694262","indexId":"70036696","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Pigeonholing pyroclasts: Insights from the 19 March 2008 explosive eruption of Kīlauea volcano","docAbstract":"

We think, conventionally, of volcanic explosive eruptions as being triggered in one of two ways: by release and expansion of volatiles dissolved in the ejected magma (magmatic explosions) or by transfer of heat from magma into an external source of water (phreatic or phreatomagmatic explosions). We document here an event where neither magma nor an external water source was involved in explosive activity at Kīlauea. Instead, the eruption was powered by the expansion of decoupled magmatic volatiles released from deeper magma, which was not ejected by the eruption, and the trigger was a collapse of near-surface wall rocks that then momentarily blocked that volatile flux. Mapping of the advected fall deposit a day after this eruption has highlighted the difficulty of constraining deposit edges from unobserved or prehistoric eruptions of all magnitudes. Our results suggest that the dispersal area of advected fall deposits could be miscalculated by up to 30% of the total, raising issues for accurate hazard zoning and assessment. Eruptions of this type challenge existing classification schemes for pyroclastic deposits and explosive eruptions and, in the past, have probably been interpreted as phreatic explosions, where the eruptive mechanism has been assumed to involve flashing of groundwater to steam.

","language":"English","publisher":"Geological Society of America","doi":"10.1130/G31509.1","issn":"00917613","usgsCitation":"Houghton, B.F., Swanson, D., Carey, R., Rausch, J., and Sutton, A., 2011, Pigeonholing pyroclasts: Insights from the 19 March 2008 explosive eruption of Kīlauea volcano: Geology, v. 39, no. 3, p. 263-266, https://doi.org/10.1130/G31509.1.","productDescription":"4 p.","startPage":"263","endPage":"266","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":245400,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":217450,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/G31509.1"}],"country":"United States","state":"Hawaii","otherGeospatial":"Kilauea Volcano","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -155.3020477294922,\n 19.395039417313967\n ],\n [\n -155.3020477294922,\n 19.433733654546185\n ],\n [\n -155.23475646972656,\n 19.433733654546185\n ],\n [\n -155.23475646972656,\n 19.395039417313967\n ],\n [\n -155.3020477294922,\n 19.395039417313967\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"39","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7b52e4b0c8380cd7939a","contributors":{"authors":[{"text":"Houghton, Bruce F. 0000-0002-7532-9770","orcid":"https://orcid.org/0000-0002-7532-9770","contributorId":140077,"corporation":false,"usgs":false,"family":"Houghton","given":"Bruce","email":"","middleInitial":"F.","affiliations":[{"id":6977,"text":"University of Hawai`i at Hilo","active":true,"usgs":false},{"id":13351,"text":"University of Hawaii Cooperative Studies Unit","active":true,"usgs":false}],"preferred":false,"id":457413,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Swanson, Don 0000-0002-1680-3591 donswan@usgs.gov","orcid":"https://orcid.org/0000-0002-1680-3591","contributorId":168817,"corporation":false,"usgs":true,"family":"Swanson","given":"Don","email":"donswan@usgs.gov","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":457412,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Carey, R.J.","contributorId":89749,"corporation":false,"usgs":true,"family":"Carey","given":"R.J.","email":"","affiliations":[],"preferred":false,"id":457414,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rausch, J.","contributorId":7944,"corporation":false,"usgs":true,"family":"Rausch","given":"J.","email":"","affiliations":[],"preferred":false,"id":457410,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Sutton, Andrew ajsutton@usgs.gov","contributorId":156244,"corporation":false,"usgs":true,"family":"Sutton","given":"Andrew","email":"ajsutton@usgs.gov","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":457411,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70033782,"text":"70033782 - 2011 - Mercury capture by selected Bulgarian fly ashes: Influence of coal rank and fly ash carbon pore structure on capture efficiency","interactions":[],"lastModifiedDate":"2012-03-12T17:21:30","indexId":"70033782","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":835,"text":"Applied Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Mercury capture by selected Bulgarian fly ashes: Influence of coal rank and fly ash carbon pore structure on capture efficiency","docAbstract":"Mercury capture by fly ash C was investigated at five lignite- and subbituminous-coal-burning Bulgarian power plants (Republika, Bobov Dol, Maritza East 2, Maritza East 3, and Sliven). Although the C content of the ashes is low, never exceeding 1.6%, the Hg capture on a unit C basis demonstrates that the low-rank-coal-derived fly ash carbons are more efficient in capturing Hg than fly ash carbons from bituminous-fired power plants. While some low-C and low-Hg fly ashes do not reveal any trends of Hg versus C, the 2nd and, in particular, the 3rd electrostatic precipitator (ESP) rows at the Republika power plant do have sufficient fly ash C range and experience flue gas sufficiently cool to capture measurable amounts of Hg. The Republika 3rd ESP row exhibits an increase in Hg with increasing C, as observed in other power plants, for example, in Kentucky power plants burning Appalachian-sourced bituminous coals. Mercury/C decreases with an increase in fly ash C, suggesting that some of the C is isolated from the flue gas stream and does not contribute to Hg capture. Mercury capture increases with an increase in Brunauer-Emmett-Teller (BET) surface area and micropore surface area. The differences in Hg capture between the Bulgarian plants burning low-rank coal and high volatile bituminous-fed Kentucky power plants suggests that the variations in C forms resulting from the combustion of the different ranks also influence the efficiency of Hg capture. ?? 2010 Elsevier Ltd.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Applied Geochemistry","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.apgeochem.2010.10.009","issn":"08832927","usgsCitation":"Kostova, I., Hower, J., Mastalerz, M., and Vassilev, S., 2011, Mercury capture by selected Bulgarian fly ashes: Influence of coal rank and fly ash carbon pore structure on capture efficiency: Applied Geochemistry, v. 26, no. 1, p. 18-27, https://doi.org/10.1016/j.apgeochem.2010.10.009.","startPage":"18","endPage":"27","numberOfPages":"10","costCenters":[],"links":[{"id":214473,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.apgeochem.2010.10.009"},{"id":242201,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a53eae4b0c8380cd6cdeb","contributors":{"authors":[{"text":"Kostova, I.J.","contributorId":7096,"corporation":false,"usgs":true,"family":"Kostova","given":"I.J.","email":"","affiliations":[],"preferred":false,"id":442420,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hower, J.C.","contributorId":100541,"corporation":false,"usgs":true,"family":"Hower","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":442423,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mastalerz, Maria","contributorId":78065,"corporation":false,"usgs":true,"family":"Mastalerz","given":"Maria","affiliations":[],"preferred":false,"id":442422,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Vassilev, S.V.","contributorId":48777,"corporation":false,"usgs":true,"family":"Vassilev","given":"S.V.","email":"","affiliations":[],"preferred":false,"id":442421,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70034079,"text":"70034079 - 2011 - Secondary chaotic terrain formation in the higher outflow channels of southern circum-Chryse, Mars","interactions":[],"lastModifiedDate":"2012-03-12T17:21:45","indexId":"70034079","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1963,"text":"Icarus","active":true,"publicationSubtype":{"id":10}},"title":"Secondary chaotic terrain formation in the higher outflow channels of southern circum-Chryse, Mars","docAbstract":"Higher outflow channel dissection in the martian region of southern circum-Chryse appears to have extended from the Late Hesperian to the Middle Amazonian Epoch. These outflow channels were excavated within the upper 1. km of the cryolithosphere, where no liquid water is expected to have existed during these geologic epochs. In accordance with previous work, our examination of outflow channel floor morphologies suggests the upper crust excavated by the studied outflow channels consisted of a thin (a few tens of meters) layer of dry geologic materials overlying an indurated zone that extends to the bases of the investigated outflow channels (1. km in depth). We find that the floors of these outflow channels contain widespread secondary chaotic terrains (i.e., chaotic terrains produced by the destruction of channel-floor materials). These chaotic terrains occur within the full range of outflow channel dissection and tend to form clusters. Our examination of the geology of these chaotic terrains suggests that their formation did not result in the generation of floods. Nevertheless, despite their much smaller dimensions, these chaotic terrains are comprised of the same basic morphologic elements (e.g., mesas, knobs, and smooth deposits within scarp-bound depressions) as those located in the initiation zones of the outflow channels, which suggests that their formation must have involved the release of ground volatiles. We propose that these chaotic terrains developed not catastrophically but gradually and during multiple episodes of nested surface collapse. In order to explain the formation of secondary chaotic terrains within zones of outflow channel dissection, we propose that the regional Martian cryolithosphere contained widespread lenses of volatiles in liquid form. In this model, channel floor collapse and secondary chaotic terrain formation would have taken place as a consequence of instabilities arising during their exhumation by outflow channel dissection. Within relatively warm upper crustal materials in volcanic settings, or within highly saline crustal materials where cryopegs developed, lenses of volatiles in liquid form within the cryolithosphere could have formed, and/or remained stable.In addition, our numerical simulations suggest that low thermal conductivity, dry fine-grained porous geologic materials just a few tens of meters in thickness (e.g., dunes, sand sheets, some types of regolith materials), could have produced high thermal anomalies resulting in subsurface melting. The existence of a global layer of dry geologic materials overlying the cryolithosphere would suggest that widespread lenses of fluids existed (and may still exist) at shallow depths wherever these materials are fine-grained and porous. The surface ages of the investigated outflow channels and chaotic terrains span a full 500 to 700. Myr. Chaotic terrains similar in dimensions and morphology to secondary chaotic terrains are not observed conspicuously throughout the surface of Mars, suggesting that intra-cryolithospheric fluid lenses may form relatively stable systems. The existence of widespread groundwater lenses at shallow depths of burial has tremendous implications for exobiological studies and future human exploration. We find that the clear geomorphologic anomaly that the chaotic terrains and outflow channels of southern Chryse form within the Martian landscape could have been a consequence of large-scale resurfacing resulting from anomalously extensive subsurface melt in this region of the planet produced by high concentrations of salts within the regional upper crust. Crater count statistics reveal that secondary chaotic terrains and the outflow channels within which they occur have overlapping ages, suggesting that the instabilities leading to their formation rapidly dissipated, perhaps as the thickness of the cryolithosphere was reset following the disruption of the upper crustal thermal structure produced during outflow channel ex","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Icarus","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.icarus.2010.09.027","issn":"00191035","usgsCitation":"Rodriguez, J., Kargel, J., Tanaka, K.L., Crown, D., Berman, D., Fairen, A., Baker, V., Furfaro, R., Candelaria, P., and Sasaki, S., 2011, Secondary chaotic terrain formation in the higher outflow channels of southern circum-Chryse, Mars: Icarus, v. 213, no. 1, p. 150-194, https://doi.org/10.1016/j.icarus.2010.09.027.","startPage":"150","endPage":"194","numberOfPages":"45","costCenters":[],"links":[{"id":244420,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":216543,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.icarus.2010.09.027"}],"volume":"213","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8919e4b08c986b316d16","contributors":{"authors":[{"text":"Rodriguez, J.A.P.","contributorId":55948,"corporation":false,"usgs":true,"family":"Rodriguez","given":"J.A.P.","email":"","affiliations":[],"preferred":false,"id":443977,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kargel, J.S.","contributorId":88096,"corporation":false,"usgs":true,"family":"Kargel","given":"J.S.","email":"","affiliations":[],"preferred":false,"id":443981,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Tanaka, K. 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In 1976 the U.S. Geological Survey (USGS) began studies of unsaturated zone hydrology next to the Nation’s first commercial disposal facility for low-level radioactive waste (LLRW) near Beatty, NV. Recognizing the need for long-term data collection, the USGS in 1983 established research management areas in the vicinity of the waste-burial facility through agreements with the Bureau of Land Management and the State of Nevada. Within this framework, the Amargosa Desert Research Site (ADRS; http://nevada.usgs.gov/adrs/) is serving as a field laboratory for the sustained study of water-, gas-, and contaminant-transport processes, and the development of models and methods to characterize flow and transport. The research is built on multiple lines of data that include: micrometeorology; evapotranspiration; plant metrics; soil and sediment properties; unsaturated-zone moisture, temperature, and gas composition; geology and geophysics; and groundwater. Contaminant data include tritium, radiocarbon, volatile-organic compounds (VOCs), and elemental mercury. Presented here is a summary of monitoring tools and techniques that are being applied in studies of waste isolation and contaminant migration.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings of the workshop on engineered barrier performance related to low-level radioactive waste, decommissioning, and uranium mill tailings facilities (NUREG/CP-0195)","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Workshop on engineered barrier performance related to low-level radioactive waste, decommissioning, and uranium mill tailings facilities","conferenceDate":"August 3-5, 2010","conferenceLocation":"Rockville, MD","language":"English","publisher":"U.S. Office of Nuclear Regulatory Research","usgsCitation":"Andraski, B.J., and Stonestrom, D.A., 2011, Waste isolation and contaminant migration - Tools and techniques for monitoring the saturated zone-unsaturated zone-plant-atmosphere continuum, in Proceedings of the workshop on engineered barrier performance related to low-level radioactive waste, decommissioning, and uranium mill tailings facilities (NUREG/CP-0195), Rockville, MD, August 3-5, 2010, p. 3-5-3-8.","productDescription":"4 p.","startPage":"3-5","endPage":"3-8","costCenters":[{"id":465,"text":"Nevada Water Science Center","active":true,"usgs":true}],"links":[{"id":350734,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.nrc.gov/reading-rm/doc-collections/nuregs/conference/cp0195/"},{"id":350735,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5a6d9dd3e4b06e28e9cac2b7","contributors":{"editors":[{"text":"Nicholson, T.J.","contributorId":75977,"corporation":false,"usgs":false,"family":"Nicholson","given":"T.J.","email":"","affiliations":[],"preferred":false,"id":726051,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Arlt, H.D.","contributorId":17492,"corporation":false,"usgs":false,"family":"Arlt","given":"H.D.","email":"","affiliations":[],"preferred":false,"id":726052,"contributorType":{"id":2,"text":"Editors"},"rank":2}],"authors":[{"text":"Andraski, Brian J. 0000-0002-2086-0417 andraski@usgs.gov","orcid":"https://orcid.org/0000-0002-2086-0417","contributorId":168800,"corporation":false,"usgs":true,"family":"Andraski","given":"Brian","email":"andraski@usgs.gov","middleInitial":"J.","affiliations":[{"id":465,"text":"Nevada Water Science Center","active":true,"usgs":true},{"id":38175,"text":"Toxics Substances Hydrology Program","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":false,"id":726049,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stonestrom, David A. 0000-0001-7883-3385 dastones@usgs.gov","orcid":"https://orcid.org/0000-0001-7883-3385","contributorId":2280,"corporation":false,"usgs":true,"family":"Stonestrom","given":"David","email":"dastones@usgs.gov","middleInitial":"A.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":726050,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70032699,"text":"70032699 - 2011 - Effects of nitrogen deposition and empirical nitrogen critical loads for ecoregions of the United States","interactions":[],"lastModifiedDate":"2018-02-21T16:14:27","indexId":"70032699","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1450,"text":"Ecological Applications","active":true,"publicationSubtype":{"id":10}},"title":"Effects of nitrogen deposition and empirical nitrogen critical loads for ecoregions of the United States","docAbstract":"Human activity in the last century has led to a significant increase in nitrogen (N) emissions and atmospheric deposition. This N deposition has reached a level that has caused or is likely to cause alterations to the structure and function of many ecosystems across the United States. One approach for quantifying the deposition of pollution that would be harmful to ecosystems is the determination of critical loads. A critical load is defined as the input of a pollutant below which no detrimental ecological effects occur over the long-term according to present knowledge. The objectives of this project were to synthesize current research relating atmospheric N deposition to effects on terrestrial and freshwater ecosystems in the United States, and to estimate associated empirical N critical loads. The receptors considered included freshwater diatoms, mycorrhizal fungi, lichens, bryophytes, herbaceous plants, shrubs, and trees. Ecosystem impacts included: (1) biogeochemical responses and (2) individual species, population, and community responses. Biogeochemical responses included increased N mineralization and nitrification (and N availability for plant and microbial uptake), increased gaseous N losses (ammonia volatilization, nitric and nitrous oxide from nitrification and denitrification), and increased N leaching. Individual species, population, and community responses included increased tissue N, physiological and nutrient imbalances, increased growth, altered root : shoot ratios, increased susceptibility to secondary stresses, altered fire regime, shifts in competitive interactions and community composition, changes in species richness and other measures of biodiversity, and increases in invasive species. The range of critical loads for nutrient N reported for U.S. ecoregions, inland surface waters, and freshwater wetlands is 1-39 kg N.ha -1.yr -1, spanning the range of N deposition observed over most of the country. The empirical critical loads for N tend to increase in the following sequence for different life forms: diatoms, lichens and bryophytes, mycorrhizal fungi, herbaceous plants and shrubs, and trees. The critical load approach is an ecosystem assessment tool with great potential to simplify complex scientific information and communicate effectively with the policy community and the public. This synthesis represents the first comprehensive assessment of empirical critical loads of N for major ecoregions across the United States. ?? 2011 by the Ecological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Ecological Applications","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1890/10-2341.1","issn":"10510761","usgsCitation":"Pardo, L., Fenn, M., Goodale, C., Geiser, L., Driscoll, C.T., Allen, E., Baron, J., Bobbink, R., Bowman, W., Clark, C., Emmett, B., Gilliam, F., Greaver, T., Hall, S., Lilleskov, E., Liu, L., Lynch, J., Nadelhoffer, K., Perakis, S., Robin-Abbott, M., Stoddard, J., Weathers, K., and Dennis, R., 2011, Effects of nitrogen deposition and empirical nitrogen critical loads for ecoregions of the United States: Ecological Applications, v. 21, no. 8, p. 3049-3082, https://doi.org/10.1890/10-2341.1.","startPage":"3049","endPage":"3082","numberOfPages":"34","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":475594,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://hdl.handle.net/2027.42/117159","text":"External Repository"},{"id":241630,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213953,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1890/10-2341.1"}],"volume":"21","issue":"8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a076ae4b0c8380cd516b5","contributors":{"authors":[{"text":"Pardo, L.H.","contributorId":93209,"corporation":false,"usgs":true,"family":"Pardo","given":"L.H.","email":"","affiliations":[],"preferred":false,"id":437536,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fenn, M.E.","contributorId":68686,"corporation":false,"usgs":true,"family":"Fenn","given":"M.E.","email":"","affiliations":[],"preferred":false,"id":437530,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Goodale, C.L.","contributorId":100677,"corporation":false,"usgs":true,"family":"Goodale","given":"C.L.","email":"","affiliations":[],"preferred":false,"id":437537,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Geiser, L.H.","contributorId":70260,"corporation":false,"usgs":true,"family":"Geiser","given":"L.H.","email":"","affiliations":[],"preferred":false,"id":437532,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Driscoll, C. 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J.","affiliations":[],"preferred":false,"id":437526,"contributorType":{"id":1,"text":"Authors"},"rank":20},{"text":"Stoddard, J.L.","contributorId":75709,"corporation":false,"usgs":true,"family":"Stoddard","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":437533,"contributorType":{"id":1,"text":"Authors"},"rank":21},{"text":"Weathers, K.C.","contributorId":41378,"corporation":false,"usgs":true,"family":"Weathers","given":"K.C.","email":"","affiliations":[],"preferred":false,"id":437523,"contributorType":{"id":1,"text":"Authors"},"rank":22},{"text":"Dennis, R.L.","contributorId":69027,"corporation":false,"usgs":true,"family":"Dennis","given":"R.L.","email":"","affiliations":[],"preferred":false,"id":437531,"contributorType":{"id":1,"text":"Authors"},"rank":23}]}} ,{"id":70035590,"text":"70035590 - 2011 - Columnar jointing in vapor-phase-altered, non-welded Cerro Galán Ignimbrite, Paycuqui, Argentina","interactions":[],"lastModifiedDate":"2015-03-12T12:46:30","indexId":"70035590","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1109,"text":"Bulletin of Volcanology","active":true,"publicationSubtype":{"id":10}},"title":"Columnar jointing in vapor-phase-altered, non-welded Cerro Galán Ignimbrite, Paycuqui, Argentina","docAbstract":"

Columnar jointing is thought to occur primarily in lavas and welded pyroclastic flow deposits. However, the non-welded Cerro Galán Ignimbrite at Paycuqui, Argentina, contains well-developed columnar joints that are instead due to high-temperature vapor-phase alteration of the deposit, where devitrification and vapor-phase crystallization have increased the density and cohesion of the upper half of the section. Thermal remanent magnetization analyses of entrained lithic clasts indicate high emplacement temperatures, above 630°C, but the lack of welding textures indicates temperatures below the glass transition temperature. In order to remain below the glass transition at 630°C, the minimum cooling rate prior to deposition was 3.0 × 10−3–8.5 × 10−2°C/min (depending on the experimental data used for comparison). Alternatively, if the deposit was emplaced above the glass transition temperature, conductive cooling alone was insufficient to prevent welding. Crack patterns (average, 4.5 sides to each polygon) and column diameters (average, 75 cm) are consistent with relatively rapid cooling, where advective heat loss due to vapor fluxing increases cooling over simple conductive heat transfer. The presence of regularly spaced, complex radiating joint patterns is consistent with fumarolic gas rise, where volatiles originated in the valley-confined drainage system below. Joint spacing is a proxy for cooling rates and is controlled by depositional thickness/valley width. We suggest that the formation of joints in high-temperature, non-welded deposits is aided by the presence of underlying external water, where vapor transfer causes crystallization in pore spaces, densifies the deposit, and helps prevent welding.

","language":"English","publisher":"Springer","doi":"10.1007/s00445-011-0524-6","issn":"02588900","usgsCitation":"Wright, H.M., Lesti, C., Cas, R.A., Porreca, M., Viramonte, J.G., Folkes, C.B., and Giordano, G., 2011, Columnar jointing in vapor-phase-altered, non-welded Cerro Galán Ignimbrite, Paycuqui, Argentina: Bulletin of Volcanology, v. 73, no. 10, p. 1567-1582, https://doi.org/10.1007/s00445-011-0524-6.","productDescription":"16 p.","startPage":"1567","endPage":"1582","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":487788,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://hdl.handle.net/11336/14542","text":"External Repository"},{"id":243910,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":216068,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00445-011-0524-6"}],"country":"Argentina","otherGeospatial":"Cerro Galán","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -67.587890625,\n -26.017297563851734\n ],\n [\n -67.587890625,\n -25.22482017676502\n ],\n [\n -66.610107421875,\n -25.22482017676502\n ],\n [\n -66.610107421875,\n -26.017297563851734\n ],\n [\n -67.587890625,\n -26.017297563851734\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"73","issue":"10","noUsgsAuthors":false,"publicationDate":"2011-09-02","publicationStatus":"PW","scienceBaseUri":"5059f7d0e4b0c8380cd4ccfc","contributors":{"authors":[{"text":"Wright, Heather M. 0000-0001-9013-507X hwright@usgs.gov","orcid":"https://orcid.org/0000-0001-9013-507X","contributorId":3949,"corporation":false,"usgs":true,"family":"Wright","given":"Heather","email":"hwright@usgs.gov","middleInitial":"M.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":451358,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lesti, Chiara","contributorId":24577,"corporation":false,"usgs":true,"family":"Lesti","given":"Chiara","email":"","affiliations":[],"preferred":false,"id":451356,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Cas, Ray A.F.","contributorId":44361,"corporation":false,"usgs":true,"family":"Cas","given":"Ray","email":"","middleInitial":"A.F.","affiliations":[],"preferred":false,"id":451357,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Porreca, Massimiliano","contributorId":17840,"corporation":false,"usgs":true,"family":"Porreca","given":"Massimiliano","email":"","affiliations":[],"preferred":false,"id":451355,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Viramonte, Jose G.","contributorId":72211,"corporation":false,"usgs":true,"family":"Viramonte","given":"Jose","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":451360,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Folkes, Christopher B.","contributorId":62032,"corporation":false,"usgs":true,"family":"Folkes","given":"Christopher","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":451359,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Giordano, Guido","contributorId":100202,"corporation":false,"usgs":true,"family":"Giordano","given":"Guido","email":"","affiliations":[],"preferred":false,"id":451361,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70032706,"text":"70032706 - 2011 - Heterogeneous pumice populations in the 2.08-Ma Cerro Galán Ignimbrite: Implications for magma recharge and ascent preceding a large-volume silicic eruption","interactions":[],"lastModifiedDate":"2015-03-12T11:39:05","indexId":"70032706","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1109,"text":"Bulletin of Volcanology","active":true,"publicationSubtype":{"id":10}},"title":"Heterogeneous pumice populations in the 2.08-Ma Cerro Galán Ignimbrite: Implications for magma recharge and ascent preceding a large-volume silicic eruption","docAbstract":"

Triggering mechanisms of large silicic eruptions remain a critical unsolved problem. We address this question for the ~2.08-Ma caldera-forming eruption of Cerro Galán volcano, Argentina, which produced distinct pumice populations of two colors: grey (5%) and white (95%) that we believe may hold clues to the onset of eruptive activity. We demonstrate that the color variations correspond to both textural and compositional variations between the clast types. Both pumice types have bulk compositions of high-K, high-silica dacite to low-silica rhyolite, but there are sufficient compositional differences (e.g., ~150 ppm lower Ba at equivalent SiO2 content and 0.03 wt.% higher TiO2 in white pumice than grey) to suggest that the two pumice populations are not related by simple fractionation. Trace element concentrations in crystals mimic bulk variations between clast types, with grey pumice containing elevated Ba, Cu, Pb, and Zn concentrations in both bulk samples (average Cu, Pb, and Zn concentrations are 27, 35, and 82 in grey pumice vs. 11, 19, and 60 in white pumice) and biotite phenocrysts and white pumice showing elevated Li concentrations in biotite and plagioclase phenocrysts. White and grey clasts are also texturally distinct: White pumice clasts contain abundant phenocrysts (44–57%), lack microlites, and have highly evolved groundmass glass compositions (76.4–79.6 wt.% SiO2), whereas grey pumice clasts contain a lower percentage of phenocrysts/microphenocrysts (35–49%), have abundant microlites, and have less evolved groundmass glass compositions (69.4–73.8 wt.% SiO2). There is also evidence for crystal transfer between magma producing white and grey pumice. Thin highly evolved melt rims surround some fragmental crystals in grey pumice clasts and appear to have come from magma that produced white pumice. Furthermore, based on crystal compositions, white bands within banded pumice contain crystals originating in grey magma. Finally, only grey pumice clasts form breadcrusted surface textures. We interpret these compositional and textural variations to indicate distinct magma batches, where grey pumice originated from an originally deeper, more volatile-rich dacite recharge magma that ascended through and mingled with the volumetrically dominant, more highly crystalline chamber that produced white pumice. Shortly before eruption, the grey pumice magma stalled within shallow fractures, forming a vanguard magma phase whose ascent may have provided a trigger for eruption of the highly crystalline rhyodacite magma. We suggest that in the case of the Cerro Galán eruption, grey pumice provides evidence not only for cryptic silicic recharge in a large caldera system but also a probable trigger for the eruption.

","language":"English","publisher":"Springer","doi":"10.1007/s00445-011-0525-5","issn":"02588900","usgsCitation":"Wright, H.M., Folkes, C.B., Cas, R.A., and Cashman, K., 2011, Heterogeneous pumice populations in the 2.08-Ma Cerro Galán Ignimbrite: Implications for magma recharge and ascent preceding a large-volume silicic eruption: Bulletin of Volcanology, v. 73, no. 10, p. 1513-1533, https://doi.org/10.1007/s00445-011-0525-5.","productDescription":"21 p.","startPage":"1513","endPage":"1533","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":241735,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":214048,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00445-011-0525-5"}],"country":"Argentina","otherGeospatial":"Cerro Galan Caldera","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -66.884765625,\n -27.527758206861897\n ],\n [\n -66.884765625,\n -25.005972656239177\n ],\n [\n -64.0283203125,\n -25.005972656239177\n ],\n [\n -64.0283203125,\n -27.527758206861897\n ],\n [\n -66.884765625,\n -27.527758206861897\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"73","issue":"10","noUsgsAuthors":false,"publicationDate":"2011-10-02","publicationStatus":"PW","scienceBaseUri":"505a308ee4b0c8380cd5d743","contributors":{"authors":[{"text":"Wright, Heather M. 0000-0001-9013-507X hwright@usgs.gov","orcid":"https://orcid.org/0000-0001-9013-507X","contributorId":3949,"corporation":false,"usgs":true,"family":"Wright","given":"Heather","email":"hwright@usgs.gov","middleInitial":"M.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":437566,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Folkes, Christopher B.","contributorId":62032,"corporation":false,"usgs":true,"family":"Folkes","given":"Christopher","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":437567,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Cas, Ray A.F.","contributorId":44361,"corporation":false,"usgs":true,"family":"Cas","given":"Ray","email":"","middleInitial":"A.F.","affiliations":[],"preferred":false,"id":437565,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cashman, Katharine V.","contributorId":40097,"corporation":false,"usgs":false,"family":"Cashman","given":"Katharine V.","affiliations":[],"preferred":false,"id":437564,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70033800,"text":"70033800 - 2011 - Segregating gas from melt: an experimental study of the Ostwald ripening of vapor bubbles in magmas","interactions":[],"lastModifiedDate":"2012-12-10T16:22:45","indexId":"70033800","displayToPublicDate":"2011-01-01T00:00:00","publicationYear":"2011","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1336,"text":"Contributions to Mineralogy and Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Segregating gas from melt: an experimental study of the Ostwald ripening of vapor bubbles in magmas","docAbstract":"Diffusive coarsening (Ostwald ripening) of H2O and H2O-CO2 bubbles in rhyolite and basaltic andesite melts was studied with elevated temperature–pressure experiments to investigate the rates and time spans over which vapor bubbles may enlarge and attain sufficient buoyancy to segregate in magmatic systems. Bubble growth and segregation are also considered in terms of classical steady-state and transient (non-steady-state) ripening theory. Experimental results are consistent with diffusive coarsening as the dominant mechanism of bubble growth. Ripening is faster in experiments saturated with pure H2O than in those with a CO2-rich mixed vapor probably due to faster diffusion of H2O than CO2 through the melt. None of the experimental series followed the time1/3 increase in mean bubble radius and time-1 decrease in bubble number density predicted by classical steady-state ripening theory. Instead, products are interpreted as resulting from transient regime ripening. Application of transient regime theory suggests that bubbly magmas may require from days to 100 years to reach steady-state ripening conditions. Experimental results, as well as theory for steady-state ripening of bubbles that are immobile or undergoing buoyant ascent, indicate that diffusive coarsening efficiently eliminates micron-sized bubbles and would produce mm-sized bubbles in 102–104 years in crustal magma bodies. Once bubbles attain mm-sizes, their calculated ascent rates are sufficient that they could transit multiple kilometers over hundreds to thousands of years through mafic and silicic melt, respectively. These results show that diffusive coarsening can facilitate transfer of volatiles through, and from, magmatic systems by creating bubbles sufficiently large for rapid ascent.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Contributions to Mineralogy and Petrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"Springer","publisherLocation":"Amsterdam, Netherlands","doi":"10.1007/s00410-010-0535-x","issn":"00107999","usgsCitation":"Lautze, N.C., Sisson, T.W., Mangan, M.T., and Grove, T., 2011, Segregating gas from melt: an experimental study of the Ostwald ripening of vapor bubbles in magmas: Contributions to Mineralogy and Petrology, v. 161, no. 2, p. 331-347, https://doi.org/10.1007/s00410-010-0535-x.","productDescription":"17 p.","startPage":"331","endPage":"347","numberOfPages":"17","costCenters":[{"id":616,"text":"Volcano Hazards Team","active":false,"usgs":true}],"links":[{"id":214262,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s00410-010-0535-x"},{"id":241967,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"161","issue":"2","noUsgsAuthors":false,"publicationDate":"2010-06-18","publicationStatus":"PW","scienceBaseUri":"505b8adee4b08c986b317425","contributors":{"authors":[{"text":"Lautze, Nicole C.","contributorId":78565,"corporation":false,"usgs":true,"family":"Lautze","given":"Nicole","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":442532,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sisson, Thomas W. 0000-0003-3380-6425 tsisson@usgs.gov","orcid":"https://orcid.org/0000-0003-3380-6425","contributorId":2341,"corporation":false,"usgs":true,"family":"Sisson","given":"Thomas","email":"tsisson@usgs.gov","middleInitial":"W.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":442529,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Mangan, Margaret T. 0000-0002-5273-8053 mmangan@usgs.gov","orcid":"https://orcid.org/0000-0002-5273-8053","contributorId":3343,"corporation":false,"usgs":true,"family":"Mangan","given":"Margaret","email":"mmangan@usgs.gov","middleInitial":"T.","affiliations":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true},{"id":617,"text":"Volcano Science Center","active":true,"usgs":true},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"preferred":true,"id":442530,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Grove, Timothy L.","contributorId":68546,"corporation":false,"usgs":true,"family":"Grove","given":"Timothy L.","affiliations":[],"preferred":false,"id":442531,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70004560,"text":"70004560 - 2011 - 'Forensic' geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores","interactions":[],"lastModifiedDate":"2021-10-08T14:39:56.226742","indexId":"70004560","displayToPublicDate":"2010-05-14T09:31:37","publicationYear":"2011","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"displayTitle":"\"Forensic\" geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores","title":"'Forensic' geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores","docAbstract":"

In order to better constrain genetic processes involved in forming mineral deposits (and ultimately exploration models), it helps to know from where the metals of interest are derived. How the metals arrived at their point of deposition, and why they were deposited there, are separate issues. We are using three different techniques in an attempt to better understand these processes for epithermal ores. All have some ambiguity inherent to them, but we think that based on our preliminary investigations, together they point to a new understanding of how some epithermal ores in the northern Great Basin form. These techniques include: 1) plotting the relative abundances of Au, Ag, Pb, As, Sb, Se, Te of the ores; 2) Pb-isotope abundances in Au-Ag minerals; and 3) Re-Os isotope analyses of Au-Ag minerals in the ores. Results to date suggest: 1) the “epithermal suite” geochemical association is likely related to the similar volatility of these metal(loid)s, and thus we conclude they are derived from the mantle as opposed to representing a shallow origin; and 2) Preliminary Pb and Re-Os isotopic analyses of Au-Ag minerals indicate that they are derived from the mafic that were part of the bimodal volcanic suite associated with the initial emergence of the Yellowstone Hotspot (YHS) in the northern Great Basin at about 16-15 Ma. Epithermal ore formation associated with the YHS which may suggest the source region of the mantle was rapidly depleted.

","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Great Basin evolution and metallogeny: 2010 symposium proceedings","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"Geological Society of Nevada 2010 Symposium","conferenceDate":"May 14-22, 2010","conferenceLocation":"Reno, NV","language":"English","publisher":"DEStech Publications, Inc.","usgsCitation":"Saunders, J., Kamenov, G., Hofstra, A.H., Unger, D.L., Creaser, R.A., and Barra, F., 2011, 'Forensic' geochemical approaches to constrain the source of Au-Ag in low-sulfidation epithermal ores, in Great Basin evolution and metallogeny: 2010 symposium proceedings, Reno, NV, May 14-22, 2010, p. 693-700.","productDescription":"8 p.","startPage":"693","endPage":"700","numberOfPages":"8","ipdsId":"IP-029905","costCenters":[{"id":35995,"text":"Geology, Geophysics, and Geochemistry Science Center","active":true,"usgs":true}],"links":[{"id":390332,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":390331,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://www.gsnv.org/"}],"country":"United States","state":"California, Colorado, Idaho, Nevada, Oregon, Utah, Wyoming","otherGeospatial":"Great Basin, Yellowstone Hotspot","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -121.37695312499999,\n 37.64903402157866\n ],\n [\n -104.96337890625,\n 37.64903402157866\n ],\n [\n -104.96337890625,\n 45.089035564831036\n ],\n [\n -121.37695312499999,\n 45.089035564831036\n ],\n [\n -121.37695312499999,\n 37.64903402157866\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","contributors":{"editors":[{"text":"Steininger, Roger","contributorId":148048,"corporation":false,"usgs":false,"family":"Steininger","given":"Roger","email":"","affiliations":[],"preferred":false,"id":824881,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Pennell, Bill","contributorId":148049,"corporation":false,"usgs":false,"family":"Pennell","given":"Bill","email":"","affiliations":[],"preferred":false,"id":824882,"contributorType":{"id":2,"text":"Editors"},"rank":2}],"authors":[{"text":"Saunders, James A.","contributorId":116108,"corporation":false,"usgs":false,"family":"Saunders","given":"James A.","affiliations":[],"preferred":false,"id":513132,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kamenov, G. D.","contributorId":121480,"corporation":false,"usgs":false,"family":"Kamenov","given":"G. D.","affiliations":[],"preferred":false,"id":513137,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hofstra, Albert H. 0000-0002-2450-1593 ahofstra@usgs.gov","orcid":"https://orcid.org/0000-0002-2450-1593","contributorId":1302,"corporation":false,"usgs":true,"family":"Hofstra","given":"Albert","email":"ahofstra@usgs.gov","middleInitial":"H.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":824880,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Unger, D. L.","contributorId":119903,"corporation":false,"usgs":false,"family":"Unger","given":"D.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":513135,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Creaser, R. A.","contributorId":121003,"corporation":false,"usgs":false,"family":"Creaser","given":"R.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":513136,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Barra, F.","contributorId":119603,"corporation":false,"usgs":false,"family":"Barra","given":"F.","email":"","affiliations":[],"preferred":false,"id":513134,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70006089,"text":"sir20105206 - 2010 - Occurrence and distribution of organic chemicals and nutrients and comparison of water-quality data from public drinking-water supplies in the Columbia aquifer in Delaware, 2000-08","interactions":[],"lastModifiedDate":"2023-03-10T12:40:21.808021","indexId":"sir20105206","displayToPublicDate":"2011-11-29T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2010-5206","title":"Occurrence and distribution of organic chemicals and nutrients and comparison of water-quality data from public drinking-water supplies in the Columbia aquifer in Delaware, 2000-08","docAbstract":"The U.S. Geological Survey, in cooperation with the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey, conducted a groundwater-quality investigation to (a) describe the occurrence and distribution of selected contaminants, and (b) document any changes in groundwater quality in the Columbia aquifer public water-supply wells in the Coastal Plain in Delaware between 2000 and 2008. Thirty public water-supply wells located throughout the Columbia aquifer of the Delaware Coastal Plain were sampled from August through November of 2008. Twenty-two of the wells in the sampling network for this project were previously sampled in 2000. Eight new wells were selected to replace wells no longer in use. Groundwater collected from the wells was analyzed for the occurrence and distribution of selected pesticides, pesticide degradates, volatile organic compounds, nutrients, and major inorganic ions. Nine of the wells were analyzed for radioactive elements (radium-226, radium-228, and radon). Groundwater-quality data were compared for sites sampled in both 2000 and 2008 to document any changes in water quality. One or more pesticides were detected in samples from 29 of the 30 wells. There were no significant differences in pesticide and pesticide degradate concentrations and similar compounds were detected when comparing sampling results from 2000 and 2008. Pesticide and pesticide degradate concentrations were generally less than 1 microgram per liter. Twenty-four compounds, 14 pesticides, and 10 pesticide degradates were detected in at least one sample; the pesticide degradates, metolachlor ethanesulfonic acid, deethylatrazine, and alachlor ethanesulfonic acid were the most frequently detected compounds, each found in more than 50 percent of samples. Almost 80 percent of the detected pesticides were agricultural herbicides, which reflects the prevalence and wide distribution of agriculture in sampled areas, as well the dominance of agricultural pesticides among the target analytes for this study. No concentration of a pesticide or pesticide degradate exceeded any regulatory standard. Dieldrin, an insecticide that has been banned for several decades, was detected at a concentration that exceeded a non-regulatory health-based screening level of 0.002 micrograms per liter at nine sites. Volatile organic compounds (VOCs) were generally detected at concentrations of less than 1 microgram per liter, although 7 of the 31 detected VOCs had concentrations greater than 1 microgram per liter. There were no significant differences in VOC concentrations from 2000 to 2008; however, among the resampled wells, the mean number of VOCs detected per well was significantly different over the 8-year period. The number of VOCs detected per well decreased in 73 percent of the resampled wells; the decrease ranged from one to eight fewer detections in 2008 than in 2000. Chloroform and methyl tert-butyl ether were the most frequently detected VOCs, at 90 percent and 63 percent, respectively, among the 30 wells. Solvents were the most frequently detected class of VOCs. All measured concentrations of VOCs in groundwater were below established standards for drinking water and below other health-based guidelines. There were no significant differences in nutrient or major-ion concentrations between 2000 and 2008, however, the medians of two field measurements, pH and dissolved oxygen, were significantly higher in 2008 than in 2000 in the resampled wells. Although pH and dissolved oxygen were higher, water was still acidic and predominantly oxic. Nitrate was the predominant nutrient species in the Columbia aquifer, with a 90-percent detection frequency. The median nitrate concentration in groundwater was 4.88 milligrams per liter, which was slightly lower than, but not significantly different from, the median of 5.23 milligrams per liter for the 2000 samples. Concentrations of nitrate exceeded the U.S. Environmental Protection Agency's Maximum Contaminant Level or Federal drinking-water standard of 10 milligrams per liter as nitrogen in samples from two wells. Eight of the 30 wells sampled had iron or manganese concentrations that exceeded the U.S. Environmental Protection Agency's Secondary Maximum Contaminant Level; nine samples exceeded the Health Advisory Limit set by the Delaware Division of Public Health of 20 milligrams per liter for sodium in drinking water. Two radiochemical isotopes, radium-226 and radon-222, were detected in all nine groundwater samples analyzed; five samples had detectable levels of radium-228 activity. None of the samples exceeded the U.S Environmental Protection Agency's Maximum Contaminant Level for radium or radon in drinking water. Although radioactive elements were more frequently detected in 2008 than in 2000, this increased detection frequency is more likely due to lower detection levels in 2008 than 2000. The average age of groundwater entering the screens of the production wells sampled in 2008 ranged from 6 to 35 years, with a median groundwater age of 22 years. Groundwater age was positively correlated with well depth and negatively correlated with dissolved oxygen. Data from the 22 resampled wells indicate a significant positive difference in the average modeled groundwater-sample-age results. The average groundwater age from samples collected in 2008 was generally 7 years older than the average groundwater age from samples collected in 2000.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20105206","collaboration":"Prepared in cooperation with the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey","usgsCitation":"Reyes, B., 2010, Occurrence and distribution of organic chemicals and nutrients and comparison of water-quality data from public drinking-water supplies in the Columbia aquifer in Delaware, 2000-08: U.S. Geological Survey Scientific Investigations Report 2010-5206, Report: vii, 37 p.; Appendices, https://doi.org/10.3133/sir20105206.","productDescription":"Report: vii, 37 p.; Appendices","costCenters":[{"id":41514,"text":"Maryland-Delaware-District of Columbia Water Science Center","active":true,"usgs":true}],"links":[{"id":116710,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2010_5206.gif"},{"id":110946,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2010/5206/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Delaware","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -76,38.46666666666667 ], [ -76,40 ], [ -74.83333333333333,40 ], [ -74.83333333333333,38.46666666666667 ], [ -76,38.46666666666667 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4799e4b07f02db48faba","contributors":{"authors":[{"text":"Reyes, Betzaida 0000-0002-1398-0824 breyes@usgs.gov","orcid":"https://orcid.org/0000-0002-1398-0824","contributorId":2250,"corporation":false,"usgs":true,"family":"Reyes","given":"Betzaida","email":"breyes@usgs.gov","affiliations":[{"id":374,"text":"Maryland Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353812,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70006086,"text":"sir20105086 - 2010 - Contamination movement around a permeable reactive barrier at Solid Waste Management Unit 12, Naval Weapons Station Charleston, North Charleston, South Carolina, 2009","interactions":[],"lastModifiedDate":"2017-01-17T10:36:55","indexId":"sir20105086","displayToPublicDate":"2011-11-29T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2010-5086","title":"Contamination movement around a permeable reactive barrier at Solid Waste Management Unit 12, Naval Weapons Station Charleston, North Charleston, South Carolina, 2009","docAbstract":"The U.S. Geological Survey and the Naval Facilities Engineering Command Southeast investigated natural and engineered remediation of chlorinated volatile organic compound groundwater contamination at Solid Waste Management Unit 12 at the Naval Weapons Station Charleston, North Charleston, South Carolina, beginning in 2000. In early 2004, groundwater contaminants began moving around the southern end of a permeable reactive barrier (PRB) installed by a consultant in December 2002. The PRB is a 130-foot-long and 3-foot-wide barrier consisting of varying amounts of zero-valent iron with or without sand mixture. Contamination moving around the PRB probably has been transported at least 75 feet downgradient from the PRB at a rate of about 15 to 29 feet per year.\nThe diversion of contamination around the southern end of the PRB may be due to construction difficulties associated with the PRB installation or to reduced permeability in the PRB. An event that took place during installation of the PRB, which may have caused permeability loss, was the collapse and subsequent abandonment of a 110-foot-long trench originally designed to be the PRB on November 11, 2002, approximately 25 feet upgradient (west) from the final PRB. Guar gum with antimicrobial preservative in a polymer slurry had been used to stabilize the abandoned trench prior to collapse and was only partially recovered. Residual guar gum can cause permeability reduction in a PRB. It also is possible that permeability reduction took place within the PRB by slow degradation of the guar gum slurry or mineral precipitation. Despite the likely permeability reduction in and near the PRB immediately following installation, there is evidence that contaminants moved through the PRB and were degraded, consistent with the planned purpose of the PRB.\nVolatile organic compound contamination in groundwater downgradient from the PRB is subject to attenuation by phytovolatilization, sorption, and biodegradation. Pulses of contamination increases have been observed in some monitoring wells downgradient from the PRB. The pulses may reflect downgradient transport of contaminant pulses; however, lateral shifting of the plume is a more likely explanation for the concentration changes at well 12MW-12S.\nThe ability to monitor the fate and behavior of the plume in the forest is severely limited because the present axis of maximum contamination in that area bypasses all but one of the existing monitoring wells (12MW-12S). Moreover, the 2009 data indicate that there are no optimally placed sentinel wells in the probable path of contaminant transport. Thus the monitoring network is no longer adequate to monitor the groundwater contamination downgradient from the PRB.","language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/sir20105086","collaboration":"Prepared in cooperation with the Naval Facilities Engineering Command Southeast","usgsCitation":"Vroblesky, D.A., Petkewich, M.D., and Conlon, K.J., 2010, Contamination movement around a permeable reactive barrier at Solid Waste Management Unit 12, Naval Weapons Station Charleston, North Charleston, South Carolina, 2009: U.S. Geological Survey Scientific Investigations Report 2010-5086, vi, 30 p.; Appendices, https://doi.org/10.3133/sir20105086.","productDescription":"vi, 30 p.; Appendices","costCenters":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"links":[{"id":116713,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2010_5086.jpg"},{"id":110944,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2010/5086/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"South Carolina","city":"North Charleston","otherGeospatial":"Naval Weapons Station Charleston","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -80.05,32.86666666666667 ], [ -80.05,33.083333333333336 ], [ -79.88333333333334,33.083333333333336 ], [ -79.88333333333334,32.86666666666667 ], [ -80.05,32.86666666666667 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4799e4b07f02db48fbb6","contributors":{"authors":[{"text":"Vroblesky, Don A. vroblesk@usgs.gov","contributorId":413,"corporation":false,"usgs":true,"family":"Vroblesky","given":"Don","email":"vroblesk@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":353791,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Petkewich, Matthew D. 0000-0002-5749-6356 mdpetkew@usgs.gov","orcid":"https://orcid.org/0000-0002-5749-6356","contributorId":982,"corporation":false,"usgs":true,"family":"Petkewich","given":"Matthew","email":"mdpetkew@usgs.gov","middleInitial":"D.","affiliations":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true},{"id":559,"text":"South Carolina Water Science Center","active":true,"usgs":true}],"preferred":true,"id":353792,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Conlon, Kevin J. 0000-0003-0798-368X kjconlon@usgs.gov","orcid":"https://orcid.org/0000-0003-0798-368X","contributorId":2561,"corporation":false,"usgs":true,"family":"Conlon","given":"Kevin","email":"kjconlon@usgs.gov","middleInitial":"J.","affiliations":[],"preferred":true,"id":353793,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":99002,"text":"sir20095179 - 2010 - Hydrostratigraphy, soil/sediment chemistry, and water quality, Potomac-Raritan-Magothy aquifer system, Puchack Well Field Superfund site and vicinity, Pennsauken Township, Camden County, New Jersey, 1997-2001","interactions":[],"lastModifiedDate":"2012-03-08T17:16:14","indexId":"sir20095179","displayToPublicDate":"2011-01-15T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2009-5179","title":"Hydrostratigraphy, soil/sediment chemistry, and water quality, Potomac-Raritan-Magothy aquifer system, Puchack Well Field Superfund site and vicinity, Pennsauken Township, Camden County, New Jersey, 1997-2001","docAbstract":"Drinking-water supplies from the Potomac-Raritan-Magothy aquifer system at the Puchack well field in Pennsauken Township, Camden County, New Jersey, have been contaminated by hexavalent chromium-the most toxic and mobile form-at concentrations exceeding the New Jersey maximum contaminant level of 100 micrograms per liter. Also, scattered but widespread instances of volatile organic compounds (primarily trichloroethylene) at concentrations that exceed their respective maximum contaminant levels in the area's ground water have been reported. Because inorganic and organic contaminants are present in the ground water underlying the Puchack well field, no water from there has been withdrawn for public supply since 1998, when the U.S. Environmental Protection Agency (USEPA) added the area that contains the Puchack well field to the National Priorities List.\r\n\r\nAs part of the USEPA's investigation of the Puchack Well Field Superfund site, the U.S. Geological Survey (USGS) conducted a study during 1997-2001 to (1) refine previous interpretations of the hydrostratigraphic framework, hydraulic gradients, and local directions of ground-water flow; (2) describe the chemistry of soils and saturated aquifer sediments; and (3) document the quality of ground water in the Potomac-Raritan-Magothy aquifer system in the area.\r\n\r\nThe four major water-bearing units of the Potomac-Raritan-Magothy aquifer system-the Upper aquifer (mostly unsaturated in the study area), the Middle aquifer, the Intermediate Sand (a local but important unit), and the Lower aquifer-are separated by confining units. The confining units contain areas of cut and fill, resulting in permeable zones that permit water to pass through them. Pumping from the Puchack well field during the past 3 decades resulted in downward hydraulic gradients that moved contaminants into the Lower aquifer, in which the production wells are finished, and caused ground water to flow northeast, locally. A comparison of current (1997-2001) water levels near the site of the former pumping center with data from previous investigations indicates that, since pumping at the Puchack well field ceased, the dominant local ground-water flow direction is to the southeast, aligned with regional flow.\r\n\r\nChromium concentrations were highest (8,010 micrograms per liter in 2000-01) in water from the Middle aquifer immediately downgradient from a possible source; the extent of this chromium plume is unknown but appears to be small. A second, unrelated, localized chromium plume also was identified in the Middle aquifer. The Intermediate Sand was found to contain an areally extensive plume of chromium-contaminated water, with concentrations up to 6,310 micrograms per liter in 2000-01, and another plume of about the same size, with concentrations up to 4,810 micrograms per liter in 2000-01, was identified in the Lower aquifer. The previous USGS investigation indicated the approximate extent of the combined plumes; the current delineation indicates that their locations have shifted slightly to the southeast since 1998.\r\n\r\nConcentrations of chromium in ground water decreased at some well locations by as much as 60 percent between sampling rounds in 1997-98 and 1999-2001. The decrease in chromium concentration at a given well could be the result of the chemical reduction of hexavalent chromium and precipitation of the resulting trivalent chromium, the sorption of hexavalent chromium to aquifer materials, or the physical movement of the plumes. Available data indicate that all three processes likely have affected concentrations. The distribution of hexavalent and total chromium in the soils and sediments of a possible source area indicates that some hexavalent chromium has undergone chemical reduction in the soils, but the degree to which this process takes place in the aquifer currently is not known. Nor is it known whether contaminated soils continue to contribute chromium to the aquifer system.\r\n\r\nContamination by vola","language":"ENGLISH","publisher":"U.S. Geological Survey","doi":"10.3133/sir20095179","collaboration":"Prepared in cooperation with the New Jersey Department of Environmental Protection","usgsCitation":"Barringer, J., Walker, R.L., Jacobsen, E., and Jankowski, P., 2010, Hydrostratigraphy, soil/sediment chemistry, and water quality, Potomac-Raritan-Magothy aquifer system, Puchack Well Field Superfund site and vicinity, Pennsauken Township, Camden County, New Jersey, 1997-2001: U.S. Geological Survey Scientific Investigations Report 2009-5179, xvi, 123 p.; Appendices; Plate 1: 36 inches x 48 inches; Plate 2: 36 inches x 48 inches; Plate 3: 36 inches x 48 inches;, https://doi.org/10.3133/sir20095179.","productDescription":"xvi, 123 p.; Appendices; Plate 1: 36 inches x 48 inches; Plate 2: 36 inches x 48 inches; Plate 3: 36 inches x 48 inches;","onlineOnly":"N","additionalOnlineFiles":"Y","temporalStart":"1997-01-01","temporalEnd":"2001-12-31","costCenters":[{"id":470,"text":"New Jersey Water Science Center","active":true,"usgs":true}],"links":[{"id":14439,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2009/5179/","linkFileType":{"id":5,"text":"html"}},{"id":126073,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2009_5179.bmp"}],"geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -75.11666666666666,39.884166666666665 ], [ -75.11666666666666,40.016666666666666 ], [ -74.91666666666667,40.016666666666666 ], [ -74.91666666666667,39.884166666666665 ], [ -75.11666666666666,39.884166666666665 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4acce4b07f02db67e8c5","contributors":{"authors":[{"text":"Barringer, Julia L.","contributorId":59419,"corporation":false,"usgs":true,"family":"Barringer","given":"Julia L.","affiliations":[],"preferred":false,"id":307230,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Walker, Richard L.","contributorId":38961,"corporation":false,"usgs":true,"family":"Walker","given":"Richard","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":307228,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Jacobsen, Eric jacobsen@usgs.gov","contributorId":3864,"corporation":false,"usgs":true,"family":"Jacobsen","given":"Eric","email":"jacobsen@usgs.gov","affiliations":[],"preferred":true,"id":307227,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Jankowski, Pamela","contributorId":50128,"corporation":false,"usgs":true,"family":"Jankowski","given":"Pamela","email":"","affiliations":[],"preferred":false,"id":307229,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":98945,"text":"pp176916 - 2010 - Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska","interactions":[{"subject":{"id":98945,"text":"pp176916 - 2010 - Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska","indexId":"pp176916","publicationYear":"2010","noYear":false,"chapter":"16","title":"Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska"},"predicate":"IS_PART_OF","object":{"id":98929,"text":"pp1769 - 2010 - The 2006 eruption of Augustine Volcano, Alaska","indexId":"pp1769","publicationYear":"2010","noYear":false,"title":"The 2006 eruption of Augustine Volcano, Alaska"},"id":1}],"isPartOf":{"id":98929,"text":"pp1769 - 2010 - The 2006 eruption of Augustine Volcano, Alaska","indexId":"pp1769","publicationYear":"2010","noYear":false,"title":"The 2006 eruption of Augustine Volcano, Alaska"},"lastModifiedDate":"2016-08-29T13:30:07","indexId":"pp176916","displayToPublicDate":"2010-12-16T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1769","chapter":"16","title":"Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska","docAbstract":"

The petrology and geochemistry of 2006 eruptive products of Augustine Volcano, Alaska, have been investigated through analyses of whole-rock samples, phenocrysts, silicate melt inclusions, and matrix glasses to constrain processes of magma evolution, eruption, and degassing. Particular attention was directed toward the concentrations and geochemical relationships involving the magmatic volatile components H2O, CO2, S, and Cl. The analytical results for 2006 samples have been integrated with data for samples of Pleistocene basalt, prehistoric andesites, and 1986 andesites from Augustine to provide a broad view of volatile behavior in Augustine magmas. The observation of generally similar geochemical features for this range of eruptions indicates that magmatic and volatile degassing processes have been relatively consistent during the past 2,100 years.

\n

Augustine andesites range from low-silica to high-silica compositions and contain phenocrysts of plagioclase, orthopyroxene, and clinopyroxene, with lesser olivine, amphiboles, iron-titanium oxides, and apatite. The groundmass varies from strongly crystallized and/or oxidized to comparatively clear, microlite-poor vesicular glass. Coexisting iron-titanium oxides of 2006 rock samples, which are generally consistent with those of prior eruptive materials, indicate ƒO2 values of approximately NNO+1.5 to NNO+2.5 and oxide crystallization temperatures of 835 to 1,052°C.

\n

The compositions of matrix and melt-inclusion glasses range from rhyodacite to rhyolite and show relationships that reflect magma evolution involving fractional crystallization and multiple stages of mingling and/or mixing. In particular, melt inclusions of low-silica andesites express mixing of magmas with more widely varying compositions, than do melt inclusions of high-silica andesites and dacites. The melt inclusions of 2006, 1986, and prehistoric andesites contain moderate to high concentrations of H2O and Cl and lesser CO2 and SO2. Comparing the abundances of H2O, CO2, and Cl in these melt inclusions with experimentally established volatile solubilities for felsic melts indicates that the 2006 and prehistoric samples are most consistent with the ascent of fluid-saturated magmas containing 1 weight percent of H2O-enriched vapor under closed-system conditions and that pressures of volatile phase exsolution range from 150 to less than 20 MPa. This closed-system behavior was maintained to quite shallow depths prior to eruption, and this pressure range is consistent with constraints derived from 2006 geodetic measurements indicating magma storage and crystallization at 4 to 6 km and upwards to near-surface depths. The magmatic fluids were relatively oxidizing and included H2O-enriched and HCl-, H2S-, S2-, and SO2 ± CO2-bearing vapors; hydrosaline aqueous liquids largely enriched in Cl-, SO42-, alkalis, and H2O; and moderately saline, H2O-poor liquids containing Cl-, SO42-, and alkali elements.

","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"The 2006 eruption of Augustine Volcano, Alaska","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/pp176916","usgsCitation":"Webster, J., Mandeville, C., Goldoff, B., Coombs, M.L., and Tappen, C., 2010, Augustine Volcano - The influence of volatile components in magmas erupted A.D. 2006 to 2,100 years before present: Chapter 16 in The 2006 eruption of Augustine Volcano, Alaska: U.S. Geological Survey Professional Paper 1769, 41 p., https://doi.org/10.3133/pp176916.","productDescription":"41 p.","startPage":"383","endPage":"423","onlineOnly":"Y","additionalOnlineFiles":"N","costCenters":[{"id":121,"text":"Alaska Volcano Observatory","active":false,"usgs":true}],"links":[{"id":203710,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/pp176916.gif"},{"id":14369,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/pp/1769/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Alaska","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -153.51470947265625,\n 59.412945785071\n ],\n [\n -153.47625732421875,\n 59.41993301322722\n ],\n [\n -153.446044921875,\n 59.428315784042574\n ],\n [\n -153.39385986328125,\n 59.428315784042574\n ],\n [\n -153.36090087890622,\n 59.41574084934491\n ],\n [\n -153.34442138671875,\n 59.39477224351409\n ],\n [\n -153.31695556640625,\n 59.37658895163648\n ],\n [\n -153.32794189453125,\n 59.33599107056162\n ],\n [\n -153.37188720703125,\n 59.32338185310805\n ],\n [\n -153.446044921875,\n 59.31777625443006\n ],\n [\n -153.5394287109375,\n 59.31076795603884\n ],\n [\n -153.577880859375,\n 59.32618430580267\n ],\n [\n -153.577880859375,\n 59.35139598294652\n ],\n [\n -153.60260009765625,\n 59.379387015928536\n ],\n [\n -153.59161376953125,\n 59.404559208021745\n ],\n [\n -153.55865478515625,\n 59.410150490100754\n ],\n [\n -153.51470947265625,\n 59.412945785071\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4aa9e4b07f02db6680a4","contributors":{"editors":[{"text":"Power, John A. 0000-0002-7233-4398 jpower@usgs.gov","orcid":"https://orcid.org/0000-0002-7233-4398","contributorId":2768,"corporation":false,"usgs":true,"family":"Power","given":"John","email":"jpower@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":647321,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Coombs, Michelle L. 0000-0002-6002-6806 mcoombs@usgs.gov","orcid":"https://orcid.org/0000-0002-6002-6806","contributorId":2809,"corporation":false,"usgs":true,"family":"Coombs","given":"Michelle","email":"mcoombs@usgs.gov","middleInitial":"L.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":647322,"contributorType":{"id":2,"text":"Editors"},"rank":2},{"text":"Freymueller, Jeffrey T.","contributorId":96841,"corporation":false,"usgs":false,"family":"Freymueller","given":"Jeffrey T.","affiliations":[{"id":26875,"text":"Michigan State University, East Lansing, MI","active":true,"usgs":false}],"preferred":false,"id":647323,"contributorType":{"id":2,"text":"Editors"},"rank":3}],"authors":[{"text":"Webster, James D.","contributorId":100859,"corporation":false,"usgs":true,"family":"Webster","given":"James D.","affiliations":[],"preferred":false,"id":307019,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Mandeville, Charlie 0000-0002-8485-3689 cmandeville@usgs.gov","orcid":"https://orcid.org/0000-0002-8485-3689","contributorId":753,"corporation":false,"usgs":true,"family":"Mandeville","given":"Charlie","email":"cmandeville@usgs.gov","affiliations":[{"id":508,"text":"Office of the AD Hazards","active":true,"usgs":true}],"preferred":true,"id":307015,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Goldoff, Beth","contributorId":94423,"corporation":false,"usgs":true,"family":"Goldoff","given":"Beth","email":"","affiliations":[],"preferred":false,"id":307018,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Coombs, Michelle L. 0000-0002-6002-6806 mcoombs@usgs.gov","orcid":"https://orcid.org/0000-0002-6002-6806","contributorId":2809,"corporation":false,"usgs":true,"family":"Coombs","given":"Michelle","email":"mcoombs@usgs.gov","middleInitial":"L.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":307016,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Tappen, Christine","contributorId":67203,"corporation":false,"usgs":true,"family":"Tappen","given":"Christine","email":"","affiliations":[],"preferred":false,"id":307017,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":98930,"text":"pp17691 - 2010 - Seismic observations of Augustine Volcano, 1970-2007","interactions":[{"subject":{"id":98930,"text":"pp17691 - 2010 - Seismic observations of Augustine Volcano, 1970-2007","indexId":"pp17691","publicationYear":"2010","noYear":false,"chapter":"1","title":"Seismic observations of Augustine Volcano, 1970-2007"},"predicate":"IS_PART_OF","object":{"id":98929,"text":"pp1769 - 2010 - The 2006 eruption of Augustine Volcano, Alaska","indexId":"pp1769","publicationYear":"2010","noYear":false,"title":"The 2006 eruption of Augustine Volcano, Alaska"},"id":1}],"isPartOf":{"id":98929,"text":"pp1769 - 2010 - The 2006 eruption of Augustine Volcano, Alaska","indexId":"pp1769","publicationYear":"2010","noYear":false,"title":"The 2006 eruption of Augustine Volcano, Alaska"},"lastModifiedDate":"2022-08-01T21:11:20.060117","indexId":"pp17691","displayToPublicDate":"2010-12-14T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":331,"text":"Professional Paper","code":"PP","onlineIssn":"2330-7102","printIssn":"1044-9612","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1769","chapter":"1","title":"Seismic observations of Augustine Volcano, 1970-2007","docAbstract":"

Seismicity at Augustine Volcano in south-central Alaska was monitored continuously between 1970 and 2007. Seismic instrumentation on the volcano has varied from one to two short-period instruments in the early 1970s to a complex network comprising 8 to 10 short-period, 6 broadband, and 1 strong-motion instrument in 2006. Since seismic monitoring began, the volcano has erupted four times; a relatively minor eruption in 1971 and three major eruptions in 1976, 1986, and 2006. Each of the major eruptions was preceded by 9 to 10 months of escalating volcano-tectonic (VT) earthquake activity that began near sea level. The major eruptions are characterized seismically by explosive eruptions, rock avalanches, lahars, and periods of small repetitive low-frequency seismic events often called drumbeats that are associated with periods of lava effusion, and they all followed a similar pattern, beginning with an explosive onset that was followed by several months of discontinuous effusive activity.

\n

Earthquake hypocenters were observed to move upward from near sea level toward the volcano’s summit over a roughly 9-month period before the 1976 and 1986 eruptions. The 1976 eruption was preceded by a small number of earthquakes that ranged in depth from 2 to 5 km below sea level. Earthquakes in this depth range were also observed following the 2006 eruption. The evolution of earthquake hypocenters associated with the three major eruptions, in conjunction with other supporting geophysical and geological observations, suggests that the Augustine magmatic system consists of a deeper magma source area at about 3.5 to 5 km below sea level and a shallower system of cracks near sea level where volatiles and magma may temporally reside as they ascend to the surface. The strong similarity in seismicity and character of the 1976, 1986, and 2006 eruptions suggests that the processes responsible for magma generation, rise, and eruption at Augustine Volcano have been roughly constant since the early 1970s.

","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"The 2006 eruption of Augustine Volcano, Alaska (Professional Paper 1769)","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/pp17691","usgsCitation":"Power, J.A., and Lalla, D.J., 2010, Seismic observations of Augustine Volcano, 1970-2007: U.S. Geological Survey Professional Paper 1769, 38 p., https://doi.org/10.3133/pp17691.","productDescription":"38 p.","startPage":"3","endPage":"40","onlineOnly":"Y","additionalOnlineFiles":"N","costCenters":[{"id":121,"text":"Alaska Volcano Observatory","active":false,"usgs":true}],"links":[{"id":115910,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/pp_1769_1.jpg"},{"id":404604,"rank":2,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_94655.htm","linkFileType":{"id":5,"text":"html"}},{"id":14353,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/pp/1769/","linkFileType":{"id":5,"text":"html"}}],"country":"United States","state":"Alaska","otherGeospatial":"Augustine Volcano","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -153.51470947265625,\n 59.412945785071\n ],\n [\n -153.47625732421875,\n 59.41993301322722\n ],\n [\n -153.446044921875,\n 59.428315784042574\n ],\n [\n -153.39385986328125,\n 59.428315784042574\n ],\n [\n -153.36090087890622,\n 59.41574084934491\n ],\n [\n -153.34442138671875,\n 59.39477224351409\n ],\n [\n -153.31695556640625,\n 59.37658895163648\n ],\n [\n -153.32794189453125,\n 59.33599107056162\n ],\n [\n -153.37188720703125,\n 59.32338185310805\n ],\n [\n -153.446044921875,\n 59.31777625443006\n ],\n [\n -153.5394287109375,\n 59.31076795603884\n ],\n [\n -153.577880859375,\n 59.32618430580267\n ],\n [\n -153.577880859375,\n 59.35139598294652\n ],\n [\n -153.60260009765625,\n 59.379387015928536\n ],\n [\n -153.59161376953125,\n 59.404559208021745\n ],\n [\n -153.55865478515625,\n 59.410150490100754\n ],\n [\n -153.51470947265625,\n 59.412945785071\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a0ae4b07f02db5fb77b","contributors":{"editors":[{"text":"Coombs, Michelle L. 0000-0002-6002-6806 mcoombs@usgs.gov","orcid":"https://orcid.org/0000-0002-6002-6806","contributorId":2809,"corporation":false,"usgs":true,"family":"Coombs","given":"Michelle","email":"mcoombs@usgs.gov","middleInitial":"L.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":647403,"contributorType":{"id":2,"text":"Editors"},"rank":1},{"text":"Freymueller, Jeffrey T.","contributorId":97458,"corporation":false,"usgs":true,"family":"Freymueller","given":"Jeffrey","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":647404,"contributorType":{"id":2,"text":"Editors"},"rank":2}],"authors":[{"text":"Power, John A. 0000-0002-7233-4398 jpower@usgs.gov","orcid":"https://orcid.org/0000-0002-7233-4398","contributorId":2768,"corporation":false,"usgs":true,"family":"Power","given":"John","email":"jpower@usgs.gov","middleInitial":"A.","affiliations":[],"preferred":true,"id":306968,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lalla, Douglas J.","contributorId":12008,"corporation":false,"usgs":true,"family":"Lalla","given":"Douglas","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":306969,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70198324,"text":"70198324 - 2010 - The role of water in generating the calc-alkaline trend: New volatile data for aleutian magmas and a new tholeiitic index","interactions":[],"lastModifiedDate":"2018-07-31T09:48:10","indexId":"70198324","displayToPublicDate":"2010-11-18T10:50:54","publicationYear":"2010","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2420,"text":"Journal of Petrology","active":true,"publicationSubtype":{"id":10}},"title":"The role of water in generating the calc-alkaline trend: New volatile data for aleutian magmas and a new tholeiitic index","docAbstract":"

The origin of tholeiitic (TH) versus calc-alkaline (CA) magmatic trends has long been debated. Part of the problem stems from the lack of a quantitative measure for the way in which a magma evolves. Recognizing that the salient feature in many TH–CA discrimination diagrams is enrichment in Fe during magma evolution, we have developed a quantitative index of Fe enrichment, the Tholeiitic Index (THI): THI = Fe4·0/Fe8·0, where Fe4·0 is the average FeO* concentration of samples with 4 ± 1 wt % MgO, and Fe8·0 is the average FeO* at 8 ± 1 wt % MgO. Magmas with THI > 1 have enriched in FeO* during differentiation from basalts to andesites and are tholeiitic; magmas with THI < 1 are calc-alkaline. Most subduction zone volcanism is CA, but to varying extents; the THI expresses the continuum of Fe enrichment observed in magmatic suites in all tectonic settings. To test various controls on the development of CA trends, we present new magmatic water measurements in melt inclusions from eight volcanoes from the Aleutian volcanic arc (Augustine, Emmons, Shishaldin, Akutan, Unalaska, Okmok, Seguam, and Korovin). Least degassed H2O contents vary from ∼2 wt % (Shishaldin) to >7 wt % (Augustine), spanning the global range in arc mafic magmas. Within the Aleutian data, H2O correlates negatively with THI, from strongly calc-alkaline (Augustine, THI = 0·65) to moderately tholeiitic (Shishaldin, THI = 1·16). The relationship between THI and magmatic water is maintained when data are included from additional arc volcanoes, back-arc basins, ocean islands, and mid-ocean ridge basalts (MORBs), supporting a dominant role of magmatic water in generating CA trends. An effective break between TH and CA trends occurs at ∼2 wt % H2O. Both pMELTs calculations and laboratory experiments demonstrate that the observed co-variation of H2O and THI in arcs can be generated by the effect of H2O on the suppression of plagioclase and the relative enhancement of Fe-oxides on the liquid line of descent. The full THI–H2O array requires an increase in fO2 with H2O, from ≤FMQ (where FMQ is the fayalite–magnetite–quartz buffer) in MORB to ∼ΔFMQ +0·5 to +2 in arcs, consistent with inferences from measured Fe and S species in glasses and melt inclusions. A curve fit to the data, H2O (wt % ± 1·2) = exp[(1·26 – THI)/0·32], may provide a useful tool for estimating the H2O content of magmas that are inaccessible to melt inclusion study.

","language":"English","publisher":"Oxford ","doi":"10.1093/petrology/egq062","usgsCitation":"Zimmer, M.M., Plank, T., Hauri, E.H., Yogodzinski, G., Stelling, P.L., Larsen, J., Singer, B., Jicha, B.R., Mandeville, C., and Nye, C.J., 2010, The role of water in generating the calc-alkaline trend: New volatile data for aleutian magmas and a new tholeiitic index: Journal of Petrology, v. 51, no. 12, p. 2411-2444, https://doi.org/10.1093/petrology/egq062.","productDescription":"34 p.","startPage":"2411","endPage":"2444","costCenters":[{"id":121,"text":"Alaska Volcano Observatory","active":false,"usgs":true},{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":356055,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"51","issue":"12","noUsgsAuthors":false,"publicationDate":"2010-11-18","publicationStatus":"PW","scienceBaseUri":"5b98b6b7e4b0702d0e844c70","contributors":{"authors":[{"text":"Zimmer, Mindy M.","contributorId":206549,"corporation":false,"usgs":false,"family":"Zimmer","given":"Mindy","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":741044,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Plank, Terry","contributorId":16743,"corporation":false,"usgs":false,"family":"Plank","given":"Terry","affiliations":[{"id":7135,"text":"Lamont Doherty Earth Observatory, Columbia University, Palisades, NY","active":true,"usgs":false}],"preferred":false,"id":741045,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hauri, Erik H.","contributorId":199798,"corporation":false,"usgs":false,"family":"Hauri","given":"Erik","email":"","middleInitial":"H.","affiliations":[{"id":35612,"text":"Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington DC 20015","active":true,"usgs":false}],"preferred":false,"id":741046,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Yogodzinski, Gene","contributorId":193631,"corporation":false,"usgs":false,"family":"Yogodzinski","given":"Gene","email":"","affiliations":[],"preferred":false,"id":741047,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Stelling, Peter L.","contributorId":84414,"corporation":false,"usgs":true,"family":"Stelling","given":"Peter","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":741048,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Larsen, Jessica","contributorId":62092,"corporation":false,"usgs":true,"family":"Larsen","given":"Jessica","affiliations":[],"preferred":false,"id":741049,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Singer, Brad","contributorId":121387,"corporation":false,"usgs":true,"family":"Singer","given":"Brad","affiliations":[],"preferred":false,"id":741050,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Jicha, Brian R.","contributorId":44062,"corporation":false,"usgs":true,"family":"Jicha","given":"Brian","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":741051,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Mandeville, Charlie 0000-0002-8485-3689 cmandeville@usgs.gov","orcid":"https://orcid.org/0000-0002-8485-3689","contributorId":753,"corporation":false,"usgs":true,"family":"Mandeville","given":"Charlie","email":"cmandeville@usgs.gov","affiliations":[{"id":508,"text":"Office of the AD Hazards","active":true,"usgs":true}],"preferred":true,"id":741052,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Nye, Christopher J.","contributorId":55418,"corporation":false,"usgs":true,"family":"Nye","given":"Christopher","email":"","middleInitial":"J.","affiliations":[{"id":121,"text":"Alaska Volcano Observatory","active":false,"usgs":true}],"preferred":false,"id":741053,"contributorType":{"id":1,"text":"Authors"},"rank":10}]}} ,{"id":98878,"text":"sir20105155 - 2010 - Surface-water quantity and quality, aquatic biology, stream geomorphology, and groundwater-flow simulation for National Guard Training Center at Fort Indiantown Gap, Pennsylvania, 2002-05","interactions":[],"lastModifiedDate":"2017-06-22T09:09:14","indexId":"sir20105155","displayToPublicDate":"2010-11-11T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2010-5155","title":"Surface-water quantity and quality, aquatic biology, stream geomorphology, and groundwater-flow simulation for National Guard Training Center at Fort Indiantown Gap, Pennsylvania, 2002-05","docAbstract":"Base-line and long-term monitoring of water resources of the National Guard Training Center at Fort Indiantown Gap in south-central Pennsylvania began in 2002. Results of continuous monitoring of streamflow and turbidity and monthly and stormflow water-quality samples from two continuous-record long-term stream sites, periodic collection of water-quality samples from five miscellaneous stream sites, and annual collection of biological data from 2002 to 2005 at 27 sites are discussed. In addition, results from a stream-geomorphic analysis and classification and a regional groundwater-flow model are included. Streamflow at the facility was above normal for the 2003 through 2005 water years and extremely high-flow events occurred in 2003 and in 2004. Water-quality samples were analyzed for nutrients, sediments, metals, major ions, pesticides, volatile and semi-volatile organic compounds, and explosives. Results indicated no exceedances for any constituent (except iron) above the primary and secondary drinking-water standards or health-advisory levels set by the U.S. Environmental Protection Agency. Iron concentrations were naturally elevated in the groundwater within the watershed because of bedrock lithology. The majority of the constituents were at or below the method detection limit. Sediment loads were dominated by precipitation due to the remnants of Hurricane Ivan in September 2004. More than 60 percent of the sediment load measured during the entire study was transported past the streamgage in just 2 days during that event. Habitat and aquatic-invertebrate data were collected in the summers of 2002-05, and fish data were collected in 2004. Although 2002 was a drought year, 2003-05 were above-normal flow years. Results indicated a wide diversity in invertebrates, good numbers of taxa (distinct organisms), and on the basis of a combination of metrics, the majority of the 27 sites indicated no or slight impairment. Fish-metric data from 25 sites indicated results similar to the invertebrate data. Stream classification based on evolution of the stream channels indicates about 94 percent of the channels were considered to be in equilibrium (type B or C channels), neither aggrading nor eroding. A regional, uncalibrated groundwater-flow model indicated the surface-water and groundwater-flow divides coincided. Because of folding of rock layers, groundwater was under confined conditions and nearly all the water leaves the facility via the streams.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/sir20105155","collaboration":"Prepared in cooperation with the Pennsylvania Department of Military and Veterans Affairs","usgsCitation":"Langland, M.J., Cinotto, P.J., Chichester, D.C., Bilger, M.D., and Brightbill, R.A., 2010, Surface-water quantity and quality, aquatic biology, stream geomorphology, and groundwater-flow simulation for National Guard Training Center at Fort Indiantown Gap, Pennsylvania, 2002-05: U.S. Geological Survey Scientific Investigations Report 2010-5155, viii, 48 p.; Appendices, https://doi.org/10.3133/sir20105155.","productDescription":"viii, 48 p.; Appendices","additionalOnlineFiles":"N","temporalStart":"2002-01-01","temporalEnd":"2005-12-31","costCenters":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true}],"links":[{"id":126164,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2010_5155.jpg"},{"id":14295,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2010/5155/","linkFileType":{"id":5,"text":"html"}}],"geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -76.78333333333333,40.36666666666667 ], [ -76.78333333333333,40.5 ], [ -76.46666666666667,40.5 ], [ -76.46666666666667,40.36666666666667 ], [ -76.78333333333333,40.36666666666667 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae5e4b07f02db68a597","contributors":{"authors":[{"text":"Langland, Michael J. 0000-0002-8350-8779 langland@usgs.gov","orcid":"https://orcid.org/0000-0002-8350-8779","contributorId":2347,"corporation":false,"usgs":true,"family":"Langland","given":"Michael","email":"langland@usgs.gov","middleInitial":"J.","affiliations":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306813,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cinotto, Peter J. pcinotto@usgs.gov","contributorId":451,"corporation":false,"usgs":true,"family":"Cinotto","given":"Peter","email":"pcinotto@usgs.gov","middleInitial":"J.","affiliations":[{"id":354,"text":"Kentucky Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306811,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Chichester, Douglas C.","contributorId":83883,"corporation":false,"usgs":true,"family":"Chichester","given":"Douglas","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":306815,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Bilger, Michael D.","contributorId":13589,"corporation":false,"usgs":true,"family":"Bilger","given":"Michael","email":"","middleInitial":"D.","affiliations":[],"preferred":false,"id":306814,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Brightbill, Robin A. 0000-0003-4683-9656 rabright@usgs.gov","orcid":"https://orcid.org/0000-0003-4683-9656","contributorId":618,"corporation":false,"usgs":true,"family":"Brightbill","given":"Robin","email":"rabright@usgs.gov","middleInitial":"A.","affiliations":[{"id":532,"text":"Pennsylvania Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306812,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70156623,"text":"70156623 - 2010 - Applying GORE-TEX technology for rapid contaminant assessments at Fort Gordon, Georgia","interactions":[],"lastModifiedDate":"2021-10-29T16:57:33.519473","indexId":"70156623","displayToPublicDate":"2010-10-14T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Applying GORE-TEX technology for rapid contaminant assessments at Fort Gordon, Georgia","docAbstract":"

The U.S. Geological Survey, in cooperation with the U.S. Department of the Army at Fort Gordon, Georgia, deployed GORE1 adsorbent samplers along creeks and floodplains to rapidly assess potential contamination at abandoned facilities and in adjacent surface water. The samplers provide screening-level data to determine the presence or absence of volatile organic compounds, semi-volatile organic compounds, and polycyclic aromatic hydrocarbons and were deployed in saturated creek and floodplain sediments adjacent to four abandoned waste-disposal/warfare-training sites. Fuelrelated compounds, not solvents, are the most prevalent organic compounds detected along segments of McCoys Creek adjacent to the 19th Street landfill; South Prong Creek adjacent to the South Prong Creek waste-disposal area; an unnamed tributary to Butler Creek adjacent to the old hospital landfill; and the Brier Creek floodplain adjacent to the Patterson anti-tank range. All 37 samplers deployed in these assessments had detections of total petroleum hydrocarbons ranging from just above 3 (laboratory method detection level) to 344 micrograms per liter. Detections of octane that ranged from 1 to 7.6 micrograms per liter were common in all assessments, except for South Prong Creek. Calculated concentrations of benzene are at or just above the National Primary Drinking Water Standard maximum contaminant level for all samplers deployed in the floodplain at the Patterson anti-tank range. The highest calculated concentration of a specific fuel-related compound was for toluene collected at one sampling site on McCoys Creek adjacent to the 19th Street landfill, but the concentration was below the National Primary Drinking Water Standard. These results are being used by Fort Gordon environmental compliance personnel to decide if further assessments are needed at these abandoned waste-disposal/warfare-training sites

","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Proceedings of the 2010 South Carolina Water Resources Conference","largerWorkSubtype":{"id":12,"text":"Conference publication"},"conferenceTitle":"2010 South Carolina Water Resources Conference","conferenceDate":"October 13-14 2010","conferenceLocation":"Columbia, South Carolina","language":"English","publisher":"Clemson University Center for Watershed Excellence","usgsCitation":"Falls, F.W., Harrelson, L.G., Ratliff, W.H., Wellborn, J.B., and Landmeyer, J., 2010, Applying GORE-TEX technology for rapid contaminant assessments at Fort Gordon, Georgia, in Proceedings of the 2010 South Carolina Water Resources Conference, Columbia, South Carolina, October 13-14 2010, 4 p.","productDescription":"4 p.","onlineOnly":"N","additionalOnlineFiles":"N","ipdsId":"IP-028335","costCenters":[{"id":559,"text":"South Carolina Water Science Center","active":true,"usgs":true}],"links":[{"id":307394,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":307392,"rank":1,"type":{"id":15,"text":"Index Page"},"url":"https://tigerprints.clemson.edu/scwrc/2010/"}],"country":"United States","state":"Georgia","otherGeospatial":"Fort Gordon","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -82.25395202636719,\n 33.293229612321824\n ],\n [\n -82.19902038574219,\n 33.312741658795304\n ],\n [\n -82.11044311523438,\n 33.392466071900756\n ],\n [\n -82.09396362304688,\n 33.41883360541482\n ],\n [\n -82.10769653320312,\n 33.43659851558681\n ],\n [\n -82.1619415283203,\n 33.447484889088855\n ],\n [\n -82.21000671386719,\n 33.42456461884056\n ],\n [\n -82.27386474609375,\n 33.390172864722466\n ],\n [\n -82.37342834472656,\n 33.34544323507435\n ],\n [\n -82.3919677734375,\n 33.296673231834106\n ],\n [\n -82.33909606933594,\n 33.280027811732154\n ],\n [\n -82.29446411132811,\n 33.277731642555224\n ],\n [\n -82.25395202636719,\n 33.293229612321824\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"55dd91ade4b0518e354dd122","contributors":{"authors":[{"text":"Falls, Fred W.","contributorId":97234,"corporation":false,"usgs":true,"family":"Falls","given":"Fred","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":569702,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Harrelson, Larry G.","contributorId":70059,"corporation":false,"usgs":true,"family":"Harrelson","given":"Larry","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":569703,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ratliff, W. Hagan","contributorId":60347,"corporation":false,"usgs":true,"family":"Ratliff","given":"W.","email":"","middleInitial":"Hagan","affiliations":[],"preferred":false,"id":569704,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wellborn, John B.","contributorId":24822,"corporation":false,"usgs":true,"family":"Wellborn","given":"John","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":569705,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Landmeyer, James 0000-0002-5640-3816 jlandmey@usgs.gov","orcid":"https://orcid.org/0000-0002-5640-3816","contributorId":3257,"corporation":false,"usgs":true,"family":"Landmeyer","given":"James","email":"jlandmey@usgs.gov","affiliations":[{"id":13634,"text":"South Atlantic Water Science Center","active":true,"usgs":true}],"preferred":true,"id":569706,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":98782,"text":"ds534 - 2010 - Groundwater-quality data for the Sierra Nevada study unit, 2008: Results from the California GAMA program","interactions":[],"lastModifiedDate":"2022-07-19T20:21:45.820456","indexId":"ds534","displayToPublicDate":"2010-10-02T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":310,"text":"Data Series","code":"DS","onlineIssn":"2327-638X","printIssn":"2327-0271","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"534","title":"Groundwater-quality data for the Sierra Nevada study unit, 2008: Results from the California GAMA program","docAbstract":"

Groundwater quality in the approximately 25,500-square-mile Sierra Nevada study unit was investigated in June through October 2008, as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The GAMA Priority Basin Project is being conducted by the U.S. Geological Survey (USGS) in cooperation with the California State Water Resources Control Board (SWRCB). The Sierra Nevada study was designed to provide statistically robust assessments of untreated groundwater quality within the primary aquifer systems in the study unit, and to facilitate statistically consistent comparisons of groundwater quality throughout California. The primary aquifer systems (hereinafter, primary aquifers) are defined by the depth of the screened or open intervals of the wells listed in the California Department of Public Health (CDPH) database of wells used for public and community drinking-water supplies. The quality of groundwater in shallower or deeper water-bearing zones may differ from that in the primary aquifers; shallow groundwater may be more vulnerable to contamination from the surface.

In the Sierra Nevada study unit, groundwater samples were collected from 84 wells (and springs) in Lassen, Plumas, Butte, Sierra, Yuba, Nevada, Placer, El Dorado, Amador, Alpine, Calaveras, Tuolumne, Madera, Mariposa, Fresno, Inyo, Tulare, and Kern Counties. The wells were selected on two overlapping networks by using a spatially-distributed, randomized, grid-based approach. The primary grid-well network consisted of 30 wells, one well per grid cell in the study unit, and was designed to provide statistical representation of groundwater quality throughout the entire study unit. The lithologic grid-well network is a secondary grid that consisted of the wells in the primary grid-well network plus 53 additional wells and was designed to provide statistical representation of groundwater quality in each of the four major lithologic units in the Sierra Nevada study unit: granitic, metamorphic, sedimentary, and volcanic rocks. One natural spring that is not used for drinking water was sampled for comparison with a nearby primary grid well in the same cell.

Groundwater samples were analyzed for organic constituents (volatile organic compounds [VOC], pesticides and pesticide degradates, and pharmaceutical compounds), constituents of special interest (N-nitrosodimethylamine [NDMA] and perchlorate), naturally occurring inorganic constituents (nutrients, major ions, total dissolved solids, and trace elements), and radioactive constituents (radium isotopes, radon-222, gross alpha and gross beta particle activities, and uranium isotopes). Naturally occurring isotopes and geochemical tracers (stable isotopes of hydrogen and oxygen in water, stable isotopes of carbon, carbon-14, strontium isotopes, and tritium), and dissolved noble gases also were measured to help identify the sources and ages of the sampled groundwater.

Three types of quality-control samples (blanks, replicates, and samples for matrix spikes) each were collected at approximately 10 percent of the wells sampled for each analysis, and the results for these samples were used to evaluate the quality of the data for the groundwater samples. Field blanks rarely contained detectable concentrations of any constituent, suggesting that contamination from sample collection, handling, and analytical procedures was not a significant source of bias in the data for the groundwater samples. Differences between replicate samples were within acceptable ranges, with few exceptions. Matrix-spike recoveries were within acceptable ranges for most compounds.

This study did not attempt to evaluate the quality of water delivered to consumers; after withdrawal from the ground, groundwater typically is treated, disinfected, or blended with other waters to maintain water quality. Regulatory benchmarks apply to finished drinking water that is served to the consumer, not to untreated groundwater. However, to provide some context for the results, concentrations of constituents measured in the groundwater were compared with regulatory and nonregulatory health-based benchmarks established by the U.S. Environmental Protection Agency (USEPA) and CDPH and with nonregulatory aesthetic and technical benchmarks established by CDPH. Comparisons between data collected for this study and drinking-water benchmarks are for illustrative purposes only and do not indicate compliance or noncompliance with regulatory benchmarks.

All organic constituents and most inorganic constituents that were detected in groundwater samples from the 30 primary grid wells in the Sierra Nevada study unit were detected at concentrations less than drinking-water benchmarks.

Of the 150 organic and special-interest constituents analyzed, 21 were detected in groundwater samples; all concentrations were less than regulatory and nonregulatory health-based benchmarks, and most were less than 1/10th of benchmark levels. One or more organic constituents were detected in 37 percent of the primary grid wells, and perchlorate was detected in 27 percent of the primary grid wells.

Most samples analyzed for inorganic and radioactive constituents had concentrations or activities less than regulatory and nonregulatory health-based benchmarks. Nutrients were not detected at concentrations greater than health-based benchmarks. Six of the 30 primary grid wells (20 percent) and 7 of the 53 lithologic grid wells had concentrations of or activities for one or two constituents that were greater than the benchmarks. Constituents present in one or more samples at concentrations or activities greater than health-based benchmarks were arsenic (5 wells, MCL-US), gross alpha particle activity (4 wells, MCL-US), boron (2 wells, NL-CA), fluoride (1 well, MCL-CA), and selenium (1 well, MCL-US). Two of the wells that had high gross alpha particle activities had uranium concentrations (MCL-CA) and uranium activities (MCL-CA) greater than the benchmark levels. Four of the 29 samples analyzed had activities of radon-222 greater than the proposed alternative MCL-US.

Most samples analyzed for inorganic constituents that had nonregulatory, aesthetic-based benchmarks (SMCLs) had concentrations less than these benchmarks. Total dissolved solids concentrations were less than the upper SMCL-CA in all 83 primary and lithologic grid well samples, and TDS concentrations were less than the recommended SMCL-CA in 79 of these samples. Manganese concentrations were greater than the SMCL-CA in 2 of the 30 primary grid wells (7 percent) and in 6 of the 53 lithologic grid wells, and iron concentrations were greater than the SMCL-CA in the same 2 primary grid wells and in 5 of the same lithologic grid wells.

","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/ds534","collaboration":"Prepared in cooperation with the California State Water Resources Control Board","usgsCitation":"Shelton, J.L., Fram, M.S., Munday, C.M., and Belitz, K., 2010, Groundwater-quality data for the Sierra Nevada study unit, 2008: Results from the California GAMA program: U.S. Geological Survey Data Series 534, ix, 82 p., https://doi.org/10.3133/ds534.","productDescription":"ix, 82 p.","additionalOnlineFiles":"N","temporalStart":"2008-01-01","temporalEnd":"2008-12-31","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":126102,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ds_534.jpg"},{"id":404074,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_94351.htm","linkFileType":{"id":5,"text":"html"}},{"id":14192,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/ds/534/","linkFileType":{"id":5,"text":"html"}}],"projection":"Albers Equal Area Conic Projection","country":"United States","state":"California","otherGeospatial":"Sierra Nevada study unit","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -121.7333,\n 34.7756\n ],\n [\n -117.9167,\n 34.7756\n ],\n [\n -117.9167,\n 40.4297\n ],\n [\n -121.7333,\n 40.4297\n ],\n [\n -121.7333,\n 34.7756\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a94e4b07f02db658ff9","contributors":{"authors":[{"text":"Shelton, Jennifer L. 0000-0001-8508-0270 jshelton@usgs.gov","orcid":"https://orcid.org/0000-0001-8508-0270","contributorId":1155,"corporation":false,"usgs":true,"family":"Shelton","given":"Jennifer","email":"jshelton@usgs.gov","middleInitial":"L.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306456,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fram, Miranda S. 0000-0002-6337-059X mfram@usgs.gov","orcid":"https://orcid.org/0000-0002-6337-059X","contributorId":1156,"corporation":false,"usgs":true,"family":"Fram","given":"Miranda","email":"mfram@usgs.gov","middleInitial":"S.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306457,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Munday, Cathy M. cmunday@usgs.gov","contributorId":3173,"corporation":false,"usgs":true,"family":"Munday","given":"Cathy","email":"cmunday@usgs.gov","middleInitial":"M.","affiliations":[],"preferred":true,"id":306458,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true},{"id":503,"text":"Office of Water Quality","active":true,"usgs":true}],"preferred":true,"id":306455,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":98717,"text":"ofr20101197 - 2010 - Groundwater quality in the Lower Hudson River Basin, New York, 2008","interactions":[],"lastModifiedDate":"2012-03-08T17:16:32","indexId":"ofr20101197","displayToPublicDate":"2010-09-18T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":330,"text":"Open-File Report","code":"OFR","onlineIssn":"2331-1258","printIssn":"0196-1497","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2010-1197","title":"Groundwater quality in the Lower Hudson River Basin, New York, 2008","docAbstract":"Water samples were collected from 32 production and domestic wells in the study area from August through November 2008 to characterize the groundwater quality. The study area, which covers 5,607 square miles, encompasses the part of the Lower Hudson River Basin that lies within New York plus the parts of the Housatonic, Hackensack, Bronx, and Saugatuck River Basins that are in New York. The study area is underlain by mainly clastic bedrock, predominantly shale, with carbonate and crystalline rock present locally. The bedrock is generally overlain by till, but surficial deposits of saturated sand and gravel are present in some areas. Of the 32 wells sampled, 16 were finished in sand and gravel deposits and 16 were finished in bedrock. The samples were collected and processed by standard U.S. Geological Survey procedures and were analyzed for 225 physiochemical properties and constituents, including major ions, nutrients, trace elements, radon-222, pesticides, and volatile organic compounds (VOCs); indicator bacteria were collected and analyzed by New York State Department of Health procedures.\r\n\r\nWater quality in the study area is generally good, but concentrations of some constituents exceeded current or proposed Federal or New York State primary or secondary drinking-water standards; the standards exceeded were color (2 samples), pH (6 samples), sodium (8 samples), fluoride (1 sample), aluminum (3 samples), arsenic (1 sample), iron (7 samples), manganese (14 samples), radon-222 (17 samples), tetrachloroethene (1 sample), and bacteria (7 samples). The pH of all samples was typically neutral or slightly basic (median 7.2); the median water temperature was 11.8 degrees C. The ions with the highest concentrations were bicarbonate [median 167 milligrams per liter (mg/L)] and calcium (median 38.2 mg/L). Groundwater in the study area ranged from very soft to very hard, but more samples were classified as very hard (181 mg/L as CaCO3 or more) than soft (60 mg/L as CaCO3 or less); the median hardness was 140 mg/L as CaCO3. The maximum concentration of nitrate plus nitrite was 2.38 mg/L as nitrogen, which did not exceed established drinking-water standards for nitrate plus nitrite (10 mg/L as nitrogen). The trace elements with the highest concentrations were strontium [median 189 micrograms per liter ((u or mu)g/L)] and barium (median 50.6 (u or mu)g/L). The highest radon-222 activities were in samples from crystalline bedrock wells [maximum 13,800 picocuries per liter (pCi/L)]. Seventeen samples had radon-222 activities that exceeded a proposed U.S. Environmental Protection Agency (USEPA) drinking-water standard of 300 pCi/L; activities in two samples exceeded a proposed alternative drinking-water standard of 4,000 pCi/L. Ten pesticides and pesticide degradates were detected among 14 samples at concentrations of 0.183 (u or mu)g/L or less; most were herbicides or their degradates. Eight VOCs were detected among six samples; these included solvents, gasoline components, and a trihalomethane. Total coliform bacteria were detected in seven samples; fecal coliform bacteria, including Escherichia coli, were detected in one sample.\r\n","language":"ENGLISH","publisher":"U.S. Geological Survey","doi":"10.3133/ofr20101197","collaboration":"Prepared in cooperation with the\r\nNew York State Department of Environmental Conservation","usgsCitation":"Nystrom, E.A., 2010, Groundwater quality in the Lower Hudson River Basin, New York, 2008: U.S. Geological Survey Open-File Report 2010-1197, vi, 22 p.; Appendices, https://doi.org/10.3133/ofr20101197.","productDescription":"vi, 22 p.; Appendices","temporalStart":"2008-08-01","temporalEnd":"2008-11-30","costCenters":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"links":[{"id":115959,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/ofr_2010_1197.jpg"},{"id":14125,"rank":100,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/of/2010/1197/","linkFileType":{"id":5,"text":"html"}}],"geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -74.83333333333333,40.5 ], [ -74.83333333333333,43 ], [ -73,43 ], [ -73,40.5 ], [ -74.83333333333333,40.5 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a95e4b07f02db659faa","contributors":{"authors":[{"text":"Nystrom, Elizabeth A. 0000-0002-0886-3439 nystrom@usgs.gov","orcid":"https://orcid.org/0000-0002-0886-3439","contributorId":1072,"corporation":false,"usgs":true,"family":"Nystrom","given":"Elizabeth","email":"nystrom@usgs.gov","middleInitial":"A.","affiliations":[{"id":474,"text":"New York Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306217,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":98672,"text":"sir20105089 - 2010 - Status and understanding of groundwater quality in the North San Francisco Bay groundwater basins, 2004: California GAMA Priority Basin Project","interactions":[],"lastModifiedDate":"2023-11-22T21:05:05.616632","indexId":"sir20105089","displayToPublicDate":"2010-09-08T00:00:00","publicationYear":"2010","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":334,"text":"Scientific Investigations Report","code":"SIR","onlineIssn":"2328-0328","printIssn":"2328-031X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"2010-5089","title":"Status and understanding of groundwater quality in the North San Francisco Bay groundwater basins, 2004: California GAMA Priority Basin Project","docAbstract":"

Groundwater quality in the approximately 1,000-square-mile (2,590-square-kilometer) North San Francisco Bay study unit was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The study unit is located in northern California in Marin, Napa, and Sonoma Counties. The GAMA Priority Basin Project is being conducted by the California State Water Resources Control Board in collaboration with the U.S. Geological Survey (USGS) and the Lawrence Livermore National Laboratory.

The GAMA North San Francisco Bay study was designed to provide a spatially unbiased assessment of untreated groundwater quality in the primary aquifer systems. The assessment is based on water-quality and ancillary data collected by the USGS from 89 wells in 2004 and water-quality data from the California Department of Public Health (CDPH) database. The primary aquifer systems (hereinafter referred to as primary aquifers) were defined by the depth interval of the wells listed in the CDPH database for the North San Francisco Bay study unit. The quality of groundwater in shallower or deeper water-bearing zones may differ from that in the primary aquifers; shallower groundwater may be more vulnerable to surficial contamination.

The first component of this study, the status of the current quality of the groundwater resource, was assessed by using data from samples analyzed for volatile organic compounds (VOC), pesticides, and naturally occurring inorganic constituents, such as major ions and trace elements. This status assessment is intended to characterize the quality of groundwater resources within the primary aquifers of the North San Francisco Bay study unit, not the treated drinking water delivered to consumers by water purveyors.

Relative-concentrations (sample concentration divided by the health- or aesthetic-based benchmark concentration) were used for evaluating groundwater quality for those constituents that have Federal and (or) California benchmarks. A relative-concentration greater than (>) 1.0 indicates a concentration above a benchmark, and less than or equal to (≤) 1.0 indicates a concentration equal to or below a benchmark. Relative-concentrations of organic and special interest constituents were classified as “high” (relative-concentration > 1.0), “moderate” (0.1 < relative-concentration ≤ 1.0), or “low” (relative-concentration ≤ 0.1). Inorganic constituent relative-concentrations were classified as “high” (relative-concentration > 1.0), “moderate” (0.5 < relative-concentration ≤ 1.0), or “low” (relative-concentration ≤ 0.5).

Aquifer-scale proportion was used as a metric for evaluating regional-scale groundwater quality. High aquifer-scale proportion is defined as the percentage of the primary aquifers that have a relative-concentration greater than 1.0; proportion is calculated on an areal rather than a volumetric basis. Moderate and low aquifer-scale proportions were defined as the percentage of the primary aquifers that have moderate and low relative-concentrations, respectively. Two statistical approaches—grid-based and spatially-weighted—were used to evaluate aquifer-scale proportion for individual constituents and classes of constituents. Grid-based and spatially-weighted estimates were comparable in the North San Francisco Bay study unit (90-percent confidence intervals).

For inorganic constituents with human-health benchmarks, relative-concentrations were high in 14.0 percent of the primary aquifers, moderate in 35.8 percent, and low in 50.2 percent. The high aquifer-scale proportion of inorganic constituents primarily reflected high aquifer-scale proportions of arsenic (10.0 percent), boron (4.1 percent), and lead (1.6 percent). In contrast, relative-concentrations of organic constituents (one or more) were high in 1.4 percent, moderate in 4.9 percent, and low in 93.7 percent (not detected in 64.8 percent) of the primary aquifers. The high aquifer-scale proportion of organic constituents primarily reflected high aquifer-scale proportions of PCE (1.3 percent), TCE (0.1 percent), and 1,1-dichloroethene (0.1 percent). The inorganic constituents with secondary maximum contaminant levels (SMCL), manganese and iron, had relative-concentrations that were high in 40.8 percent and 24.4 percent of the primary aquifers, respectively. Of the 255 organic and special-interest constituents analyzed for, 26 constituents were detected. Two organic constituents were frequently detected (in 10 percent or more of samples), the trihalomethane chloroform and the herbicide simazine, but both were detected at low relative-concentrations.

The second component of this study, the understanding assessment, identified the natural and human factors that affect groundwater quality by evaluating land use, physical characteristics of the wells, geochemical conditions of the aquifer, and water temperature. Results from these evaluations were used to explain the occurrence and distribution of constituents in the study unit. The understanding assessment indicated that a majority of the wells that contained nitrate also had an urban or agricultural land-use classification, had a modern or mixed age classification, and had depths to their top perforations <100 ft (30 m). Geochemical data are consistent with partial denitrification of nitrate in some reducing groundwaters in the terminal and deeper parts of the flow system.

High and moderate relative-concentrations of arsenic may be attributed to reductive dissolution of manganese or iron oxides, or to desorption or inhibition of arsenic sorption under alkaline conditions. Arsenic concentrations increased with increasing depth and groundwater age in the North San Francisco Bay study unit. High to moderate relative-concentrations of boron were primarily associated with hydrothermal activity or high-salinity waters in the Napa Sonoma lowlands. Simazine was detected in groundwater classified as modern and mixed age more often than in groundwater classified as pre-modern age, while chloroform was detected most often in groundwater classified as mixed age.

Simazine and chloroform also were observed in wells that had surrounding land use classified as agricultural or land use classified as urban, and top of perforation depths less than 100 ft (30 m). Together, the occurrence of chloroform and simazine in shallow wells with modern or mixed groundwater located in urban or agricultural areas suggests that these constituents result from anthropogenic activities during the last 50 years.

Tritium, helium-isotope, and carbon-14 data were used to classify the predominant age of groundwater samples into three categories: modern (water that has entered the aquifer in the last 50 years), pre-modern (water that entered the aquifer more than 50 years to tens of thousands of years ago), and mixed (mixtures of modern- and pre-modern-age waters). Arsenic, iron, and total dissolved solids (TDS) concentrations were significantly greater in groundwater having pre-modern-age classification than modern, suggesting that these constituents accumulate with groundwater residence time.

","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/sir20105089","collaboration":"Prepared in cooperation with the California State Water Resources Control Board","usgsCitation":"Kulongoski, J., Belitz, K., Landon, M.K., and Farrar, C., 2010, Status and understanding of groundwater quality in the North San Francisco Bay groundwater basins, 2004: California GAMA Priority Basin Project: U.S. Geological Survey Scientific Investigations Report 2010-5089, xii, 65 p., https://doi.org/10.3133/sir20105089.","productDescription":"xii, 65 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":422852,"rank":3,"type":{"id":36,"text":"NGMDB Index Page"},"url":"https://ngmdb.usgs.gov/Prodesc/proddesc_93989.htm","linkFileType":{"id":5,"text":"html"}},{"id":14076,"rank":2,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/sir/2010/5089/","linkFileType":{"id":5,"text":"html"}},{"id":115937,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/sir_2010_5089.jpg"}],"country":"United States","state":"California","otherGeospatial":"North San Francisco Bay","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -123.1,\n 38.7667\n ],\n [\n -123.1,\n 38.0958\n ],\n [\n -121.33,\n 38.0958\n ],\n [\n -121.33,\n 38.7667\n ],\n [\n -123.1,\n 38.7667\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e49dae4b07f02db5e0133","contributors":{"authors":[{"text":"Kulongoski, Justin T. 0000-0002-3498-4154","orcid":"https://orcid.org/0000-0002-3498-4154","contributorId":94750,"corporation":false,"usgs":true,"family":"Kulongoski","given":"Justin T.","affiliations":[],"preferred":false,"id":306095,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Belitz, Kenneth 0000-0003-4481-2345 kbelitz@usgs.gov","orcid":"https://orcid.org/0000-0003-4481-2345","contributorId":442,"corporation":false,"usgs":true,"family":"Belitz","given":"Kenneth","email":"kbelitz@usgs.gov","affiliations":[{"id":503,"text":"Office of Water Quality","active":true,"usgs":true},{"id":466,"text":"New England Water Science Center","active":true,"usgs":true},{"id":451,"text":"National Water Quality Assessment Program","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true},{"id":376,"text":"Massachusetts Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306093,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Landon, Matthew K. 0000-0002-5766-0494 landon@usgs.gov","orcid":"https://orcid.org/0000-0002-5766-0494","contributorId":392,"corporation":false,"usgs":true,"family":"Landon","given":"Matthew","email":"landon@usgs.gov","middleInitial":"K.","affiliations":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"preferred":true,"id":306092,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Farrar, Christopher","contributorId":62300,"corporation":false,"usgs":true,"family":"Farrar","given":"Christopher","affiliations":[],"preferred":false,"id":306094,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ]}