A field study of surface water and groundwater interactions during baseflow and stormflow conditions was performed at the Reedy Creek watershed in the Virginia Coastal Plain. Three estimates of the average saturated hydraulic conductivity (Ks) of the unconfined aquifer were in reasonable agreement (ranging from 0.0033 to 0.010 cm/s), indicating that baseflow in the creek is entirely from the drainage of shallow groundwater from the relatively thin (1–6 m thick) unconfined aquifer. This relatively permeable surficial aquifer was found to be underlain by dark, olive grey, clay-silt and diatomaceous Miocene deposits of low permeability known as the Calvert Formation, which is believed to function as a confining bed in the area.
A chemical hydrograph separation technique was used to resolve the contributions of [old] (pre-event) and [new] (event) water to stormflow. Results from a major rainstorm indicated that old water dominated the stormflow response of the watershed, although the new water contribution approached 40% at the hydrograph peak. Stormflow at Reedy Creek appears to result from saturation overland flow from variable source areas which include the stream channels and a significant part of the riparian wetland area. This response appears to be attributable to the transient dynamics of the shallow groundwater flow system and to the formation of localized groundwater mounds which raise the water-table to the wetland surface.
Opaline sinter samples collected at Yellowstone National Park (YNP) were analyzed for gold by neutron activation and for other trace elements by the inductively coupled plasma optical emission spectroscopy (ICP-OES) method. No correlation was found between Au and As, Sb, or total Fe in the sinters, although the sample containing the highest Au also contains the highest Sb. There also was no correlation of Au in the sinter with the H2S concentration in the discharged hot spring water or with the estimated temperature of last equilibration of the water with the surrounding rock. The Au in rhyolitic tuffs and lavas at YNP found within the Yellowstone caldera show the same range in Au as do those outside the caldera, while thermal waters from within this caldera all have been found to contain relatively low dissolved Au and to deposit sinters that contain relatively little Au. Therefore, it is not likely that variations in Au concentrations among these sinters simply reflect differences in leachable Au in the rocks through which the hydrothermal fluids have passed. Rather, variations in [H2S], the concentration of total dissolved sulfide, that result from different physical and chemical processes that occur in different parts of the hydrothermal system appear to exert the main control on the abundance of Au in these sinters.
Hydrothermal fluids at YNP convect upward through a series of successively shallower and cooler reservoirs where water-rock chemical and isotopic reactions occur in response to changing temperature and pressure. In some parts of the system the fluids undergo decompressional boiling, and in other parts they cool conductively without boiling. Mixing of ascending water from deep in the system with shallow groundwaters is common. All three processes generally result in a decrease in [H2S] and destabilize dissolved gold bisulfide complexes in reservoir waters in the YNP system. Thus, different reservoirs in rocks of similar composition and at similar temperatures may contain waters with different [H2S] and [Au].
The [H2S] in a subsurface reservoir water is difficult to assess on the basis of analyses of hot spring waters because of uncertainties about steam loss during fluid ascent. However, the same processes that result in low [H2S] in reservoir waters also tend to result in decreases in the ratio of
A high
Some or all of the Au that comes out of solution when an initial gold bisulfide complex breaks down as a result of loss of H2S may be swept up to the surface as solid (probably colloidal) particles, depending on the rate of flow of the mixture of water and steam, and the geometry of the channel. Where colloidal silica also forms as a result of this boiling, free Au apparently becomes attached to the colloidal silica and deposits where the silica deposits.
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Jr.","contributorId":86286,"corporation":false,"usgs":true,"family":"Dodd","given":"C.K.","suffix":"Jr.","affiliations":[],"preferred":false,"id":317786,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":1014928,"text":"1014928 - 1994 - Metal concentration in the gill, gastrointestinal tract, and carcass of white suckers (Catostomus commersoni) in relation to lake acidity","interactions":[],"lastModifiedDate":"2017-05-24T12:32:28","indexId":"1014928","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3728,"text":"Water, Air, & Soil Pollution","onlineIssn":"1573-2932","printIssn":"0049-6979","active":true,"publicationSubtype":{"id":10}},"title":"Metal concentration in the gill, gastrointestinal tract, and carcass of white suckers (Catostomus commersoni) in relation to lake acidity","docAbstract":"Adult white suckers were collected from four lakes in Maine that ranged in pH from 7.0 to 5.4. The gastrointestinal tract and remainder of the carcass of fishes of similar age and size from each lake, and gills from additional fishes of similar size, were analyzed for Al, Cd, Pb, and Zn. Carcasses were also analyzed for Hg. Concentrations of Al, Cd, and Pb were highest in the gastrointestinal tract and lowest in the carcass; Zn concentration was highest in the gill. For carcass, all metals except Al differed significantly among lakes, for gill tissue Cd and Pb differed, and for gastrointestinal tract, only Cd differed among lakes. Where differences were significant, patterns among lakes were similar in each tissue analyzed. Concentrations of Cd, Hg, and Pb were negatively correlated with lake water pH, acid neutralizing capacity (ANC), Ca, and lake:watershed area, and positively correlated with lake water SO4, indicating that concentrations were higher in fish from more acidic lakes. Zinc concentrations in gills were unrelated to lake acidity, and carcass concentrations were higher in the less acidic lakes, which is the opposite of the pattern for the other metals studied. Zinc in gastrointestinal tract did not differ among lakes. Although the lakes we studied were located in undisturbed watersheds and did not receive any point source discharges, fish metal concentrations were comparable to or higher than those reported from waters receiving industrial discharges.
","language":"English","publisher":"Springer","doi":"10.1007/BF00477991","usgsCitation":"Haines, T., and Brumbaugh, W.G., 1994, Metal concentration in the gill, gastrointestinal tract, and carcass of white suckers (Catostomus commersoni) in relation to lake acidity: Water, Air, & Soil Pollution, v. 73, no. 1, p. 265-274, https://doi.org/10.1007/BF00477991.","productDescription":"10 p.","startPage":"265","endPage":"274","numberOfPages":"10","costCenters":[{"id":192,"text":"Columbia Environmental Research Center","active":true,"usgs":true},{"id":365,"text":"Leetown Science Center","active":true,"usgs":true}],"links":[{"id":130917,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":267639,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/BF00477991"}],"volume":"73","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4a4be4b07f02db6256d6","contributors":{"authors":[{"text":"Haines, T.A.","contributorId":83062,"corporation":false,"usgs":true,"family":"Haines","given":"T.A.","email":"","affiliations":[],"preferred":false,"id":321560,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Brumbaugh, W. G.","contributorId":106441,"corporation":false,"usgs":true,"family":"Brumbaugh","given":"W.","email":"","middleInitial":"G.","affiliations":[{"id":595,"text":"U.S. Geological Survey","active":false,"usgs":true}],"preferred":false,"id":321561,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70017462,"text":"70017462 - 1994 - Chemical reaction path modeling of ore deposition in Mississippi Valley-type Pb-Zn deposits of the Ozark region, US midcontinent","interactions":[],"lastModifiedDate":"2024-01-03T17:25:25.230368","indexId":"70017462","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"Chemical reaction path modeling of ore deposition in Mississippi Valley-type Pb-Zn deposits of the Ozark region, US midcontinent","docAbstract":"The Ozark region of the U.S. midcontinent is host to a number of Mississippi Valley-type districts, including the world-class Viburnum Trend, Old Lead Belt, and Tri-State districts and the smaller Southeast Missouri barite, Northern Arkansas, and Central Missouri districts. There is increasing evidence that the Ozark Mississippi Valley-type districts formed locally within a large, interconnected hydrothermal system that also produced broad fringing areas of trace mineralization, extensive subtle hydrothermal alteration, broad thermal anomalies, and regional deposition of hydrothermal dolomite cement. The fluid drive was provided by gravity flow accompanying uplift of foreland thrust belts during the Late Pennsylvanian to Early Permian Ouaehita orogeny.In this study, we use chemical speciation and reaction path calculations, based on quantitative chemical analyses of fluid inclusions, to constrain likely hydrothermal brine compositions and to determine which precipitation mechanisms are consistent with the hydrothermal mineral assemblages observed regionally and locally within each Mississippi Valley-type district in the Ozark region. Deposition of the regional hydrothermal dolomite cement with trace sulfides likely occurred in response to near-isothermal effervescence of CO 2 from basinal brines as they migrated to shallower crustal levels and lower confining pressures. In contrast, our calculations indicate that no one depositional process can reproduce the mineral assemblages and proportions of minerals observed in each Ozark ore district; rather, individual districts require specific depositional mechanisms that reflect the local host-rock composition, structural setting, and hydrology.Both the Northern Arkansas and Tri-State districts are localized by normal faults that likely allowed brines to rise from deeper Cambrian-Ordovician dolostone aquifers into shallower carbonate sequences dominated by limestones. In the Northern Arkansas district, jasperoid preferentially replaced limestones in the mixed dolostone-limestone sedimentary packages. Modeling results indicate that the ore and alteration assemblages in the Tri-State and Northern Arkansas districts resulted from the flow of initially dolomite-saturated brines into cooler limestones. Adjacent to fluid conduits where water/rock ratios were the highest, the limestone was replaced by dolomite. As the fluids moved outward into cooler limestone, jasperoid and sulfide replaced limestone. Isothermal boiling of the ore fluids may have produced open-space filling of hydrothermal dolomite with minor sulfides in breccia and fault zones. Local mixing of the regional brine with locally derived sulfur undoubtedly played a role in the development of sulfide-rich ore runs.Sulfide ores of the Central Missouri district are largely open-space filling of sphalerite plus minor galena in dolostone karst features localized along a broad anticline. Hydrothermal solution collapse during ore deposition was a minor process, indicating dolomite was slightly undersaturated during ore deposition. No silicification and only minor hydrothermal dolomite is present in the ore deposits. The reaction path that best explains the features of the Central Missouri sulfide deposits is the near-isothermal mixing of two dolomite-saturated fluids with different H 2 S and metal contents. Paleokarst features may have allowed the regional brine to rise stratigraphically and mix with locally derived, H 2 S-rich fluids. The Viburnum Trend and Old Lead Belt ores are galena rich with lesser amounts of sphalerite; they replace the most permeable dolostone facies in the Bonneterre Dolomite. Hydrothermal dissolution of host dolostone was concurrent with sulfide deposition, but dolomite deposition occurred episodically between periods of sulfide deposition. The important ore controls in these districts are a variety of sedimentary and geologic features that allowed cross-stratigraphic fluid flow and provided opportunities for fluid mixing. The reaction path which best reproduces the broad features of the Viburnum Trend and Old Lead Belt ores is one in which a dolomite-saturated, lead-rich, zinc- and H 2 S-poor brine mixes with a less saline, H 2 S-rich fluid. The brine became enriched in K, Mg, and Pb and depleted in H 2 S as it flowed through sandstone and redbed aquifers prior to entering the district. This mixing model is consistent with the abundant fluid inclusion and stable isotope evidence for fluid mixing in the districts. Small amounts of cooling associated with the mixing may have contributed to sulfide deposition.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.89.6.1361","issn":"03610128","usgsCitation":"Plumlee, G., Leach, D.L., Hofstra, A., Landis, G.P., Rowan, E., and Viets, J., 1994, Chemical reaction path modeling of ore deposition in Mississippi Valley-type Pb-Zn deposits of the Ozark region, US midcontinent: Economic Geology, v. 89, no. 6, p. 1361-1383, https://doi.org/10.2113/gsecongeo.89.6.1361.","productDescription":"23 p.","startPage":"1361","endPage":"1383","costCenters":[],"links":[{"id":228512,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alabama, Arkansas, Illinois, Indiana, Kansas, Kentucky, Louisiana, Mississippi, Missouri, Oklahoma, Tennessee, Texas","otherGeospatial":"Ozarks","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -98.17169017092607,\n 39.06166617237287\n ],\n [\n -98.17169017092607,\n 31.661702492806285\n ],\n [\n -85.2462291629069,\n 31.661702492806285\n ],\n [\n -85.2462291629069,\n 39.06166617237287\n ],\n [\n -98.17169017092607,\n 39.06166617237287\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"89","issue":"6","noUsgsAuthors":false,"publicationDate":"1994-10-01","publicationStatus":"PW","scienceBaseUri":"5059f593e4b0c8380cd4c2c5","contributors":{"authors":[{"text":"Plumlee, G.S.","contributorId":80698,"corporation":false,"usgs":true,"family":"Plumlee","given":"G.S.","email":"","affiliations":[],"preferred":false,"id":376542,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Leach, D. L.","contributorId":18758,"corporation":false,"usgs":true,"family":"Leach","given":"D.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":376539,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hofstra, A. H. 0000-0002-2450-1593","orcid":"https://orcid.org/0000-0002-2450-1593","contributorId":41426,"corporation":false,"usgs":true,"family":"Hofstra","given":"A. H.","affiliations":[],"preferred":false,"id":376541,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Landis, G. P.","contributorId":102846,"corporation":false,"usgs":true,"family":"Landis","given":"G.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":376544,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Rowan, E. L. 0000-0001-5753-6189","orcid":"https://orcid.org/0000-0001-5753-6189","contributorId":34921,"corporation":false,"usgs":true,"family":"Rowan","given":"E. L.","affiliations":[],"preferred":false,"id":376540,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Viets, J.G.","contributorId":82300,"corporation":false,"usgs":true,"family":"Viets","given":"J.G.","affiliations":[],"preferred":false,"id":376543,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":1008441,"text":"1008441 - 1994 - Tag recovery estimates of migration of striped bass from spawning areas of the Chesapeake Bay","interactions":[],"lastModifiedDate":"2016-01-11T15:20:43","indexId":"1008441","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3624,"text":"Transactions of the American Fisheries Society","active":true,"publicationSubtype":{"id":10}},"title":"Tag recovery estimates of migration of striped bass from spawning areas of the Chesapeake Bay","docAbstract":"In 1988–1991 striped bass Morone saxatilis were collected for tagging from various spawning areas within the Hudson River (New York) and the Chesapeake Bay (Maryland). The fish were tagged and released during traditional periods of spawning and recovered by commercial and recreational fishermen. The proportion of fish that migrated in spring–fall from spawning areas in Chesapeake Bay to more northern waters of mid-Atlantic and New England states was estimated from the geographically stratified tag returns. Most of the tagged fish were 40–100 cm total length (TL). The estimated proportion of migrant striped bass increased with body size, and nearly all fish larger than 100 cm TL left the bay during the spring–fall migration. Sex-specific differences in migration appear to be associated with the differences in body size of mature males and females, thus lending support to previously hypothesized patterns of striped bass migration.
","language":"English","publisher":"Taylor & Francis","doi":"10.1577/1548-8659(1994)123<0950:TREOMO>2.3.CO;2","usgsCitation":"Dorazio, R., Hattala, K., McCollough, C., and Skjeveland, J., 1994, Tag recovery estimates of migration of striped bass from spawning areas of the Chesapeake Bay: Transactions of the American Fisheries Society, v. 123, p. 950-963, https://doi.org/10.1577/1548-8659(1994)123<0950:TREOMO>2.3.CO;2.","productDescription":"14 p.","startPage":"950","endPage":"963","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":132928,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"123","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4adee4b07f02db68712b","contributors":{"authors":[{"text":"Dorazio, R.M. 0000-0003-2663-0468","orcid":"https://orcid.org/0000-0003-2663-0468","contributorId":23475,"corporation":false,"usgs":true,"family":"Dorazio","given":"R.M.","affiliations":[],"preferred":false,"id":317781,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hattala, K.A.","contributorId":88690,"corporation":false,"usgs":true,"family":"Hattala","given":"K.A.","email":"","affiliations":[],"preferred":false,"id":317783,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McCollough, C.B.","contributorId":6015,"corporation":false,"usgs":true,"family":"McCollough","given":"C.B.","email":"","affiliations":[],"preferred":false,"id":317780,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Skjeveland, J.E.","contributorId":80224,"corporation":false,"usgs":true,"family":"Skjeveland","given":"J.E.","email":"","affiliations":[],"preferred":false,"id":317782,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70184279,"text":"70184279 - 1994 - Seasonal and annual survival of emperor geese","interactions":[],"lastModifiedDate":"2018-07-15T10:57:39","indexId":"70184279","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2508,"text":"Journal of Wildlife Management","active":true,"publicationSubtype":{"id":10}},"title":"Seasonal and annual survival of emperor geese","docAbstract":"Population levels of emperor geese (Chen canagica) in Alaska in 1993 were about half that estimated in the 1960s. Survival information is necessary for managers to decide how to best enhance recovery of this species to former levels. We calculated seasonal and annual estimates of emperor goose survival from resightings of neck-collared birds. Geese were neck collared in 1988-90 on their breeding grounds in the Yukon-Kuskokwim Delta, Alaska, and resighted each spring and fall, 1988-92, at staging areas on the Alaska Peninsula. Adult monthly survival rates during overwinter periods (1 Oct-30 Apr) were not different (P = 0.281) among years (Ŝ'= 0.940, SE = 0.009), whereas monthly rates of oversummer (1 May-30 Sep) survival showed annual variation (P = 0.048). However, we constrained oversummer survival to a single estimate of 0.980 (0.010). Monthly survival estimates for juveniles during their first overwinter period did not vary among years (P = 0.999) and was 0.710 (0.018). Subsequent monthly survival for juveniles was 0.943 (0.010), similar to that for adults. We developed an adjustment procedure to account for philopatric behavior of geese and this enabled us to use data for postbanding (1 Aug-30 Sep) periods. Survival estimates were low compared with those for other goose species, particularly for juveniles. We addressed collar loss and heterogeneity in resighting probabilities and felt their contribution to potential model bias was insignificant. Annual survival among adults (Ŝ' = 0.631, SE = 0.023) was not different (P = 0.709) from that observed during 1982-85 (Petersen 1992). The similarity in survival rates in these studies suggests that harvest regimes did not differ between the 2 periods. This suggests that continued subsistence harvest has contributed to persistent low population levels in emperor geese.
","language":"English","publisher":"Wiley","doi":"10.2307/3809325","usgsCitation":"Schmutz, J.A., Cantor, S.E., and Petersen, M.R., 1994, Seasonal and annual survival of emperor geese: Journal of Wildlife Management, v. 58, no. 3, p. 525-535, https://doi.org/10.2307/3809325.","productDescription":"11 p.","startPage":"525","endPage":"535","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":336902,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","volume":"58","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58be8340e4b014cc3a3a9a23","contributors":{"authors":[{"text":"Schmutz, Joel A. 0000-0002-6516-0836 jschmutz@usgs.gov","orcid":"https://orcid.org/0000-0002-6516-0836","contributorId":1805,"corporation":false,"usgs":true,"family":"Schmutz","given":"Joel","email":"jschmutz@usgs.gov","middleInitial":"A.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true}],"preferred":true,"id":680851,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cantor, Susan E.","contributorId":187555,"corporation":false,"usgs":false,"family":"Cantor","given":"Susan","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":680852,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Petersen, Margaret R. 0000-0001-6082-3189 mrpetersen@usgs.gov","orcid":"https://orcid.org/0000-0001-6082-3189","contributorId":167729,"corporation":false,"usgs":true,"family":"Petersen","given":"Margaret","email":"mrpetersen@usgs.gov","middleInitial":"R.","affiliations":[{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true}],"preferred":true,"id":680853,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":85402,"text":"85402 - 1994 - Population analysis","interactions":[],"lastModifiedDate":"2012-02-02T00:04:00","indexId":"85402","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"title":"Population analysis","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"Research and Management Techniques for Wildlife and Habitats","largerWorkSubtype":{"id":4,"text":"Other Government Series"},"language":"English","publisher":"The Wildlife Society","publisherLocation":"Bethesda, MD","usgsCitation":"Johnson, D.H., 1994, Population analysis, chap. of Research and Management Techniques for Wildlife and Habitats, p. 419-444.","productDescription":"p. 419-444","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":127749,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ad6e4b07f02db6842ec","contributors":{"editors":[{"text":"Bookhout, Theodore A.","contributorId":112449,"corporation":false,"usgs":true,"family":"Bookhout","given":"Theodore","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":504500,"contributorType":{"id":2,"text":"Editors"},"rank":1}],"authors":[{"text":"Johnson, Douglas H. 0000-0002-7778-6641","orcid":"https://orcid.org/0000-0002-7778-6641","contributorId":70327,"corporation":false,"usgs":true,"family":"Johnson","given":"Douglas","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":296035,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70184244,"text":"70184244 - 1994 - Blood sampling in juvenile buff-breasted sandpipers: Movement, weight change and survival","interactions":[],"lastModifiedDate":"2017-03-03T15:32:25","indexId":"70184244","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2284,"text":"Journal of Field Ornithology","active":true,"publicationSubtype":{"id":10}},"title":"Blood sampling in juvenile buff-breasted sandpipers: Movement, weight change and survival","docAbstract":"The effect of blood sampling on juvenile Buff-breasted Sandpipers (Tryngites subruficollis) was evaluated by comparing movements, mass, and survival of 10 broods (37 chicks) that were bled and eight broods (31 chicks) that were not bled. Blood was sampled from the jugular vein of chicks when they weighed 9.1 ± 0.9 g (x̄ ± SD) on or within 1 d of hatch. Chicks showed few short-term negative effects from blood sampling. Individual chicks suffered little physical injury, and five of eight chicks where injury occurred (i.e., hematomas formed) survived to fledging. Furthermore, bled broods gained mass at a comparable rate during the first 5 d post-hatch, and were resighted at similar frequencies as broods that were not bled. Bled broods moved slightly longer distances than control broods 1 d after hatch, however. This increased activity may have been stress-induced, but was only temporary; bled and control broods made similar long-term movements, and the probability of resighting was similar at fledging. With the proper precautions, it appears that Buff-breasted Sandpiper young can be safely sampled for blood at an early age without causing undue harm.
","language":"English","publisher":"Wiley","usgsCitation":"Lanctot, R.B., 1994, Blood sampling in juvenile buff-breasted sandpipers: Movement, weight change and survival: Journal of Field Ornithology, v. 65, no. 4, p. 534-542.","productDescription":"9 p.","startPage":"534","endPage":"542","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":336831,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Prudhoe Bay","volume":"65","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58ba8ebfe4b0bcef64f0b949","contributors":{"authors":[{"text":"Lanctot, Richard B.","contributorId":31894,"corporation":false,"usgs":true,"family":"Lanctot","given":"Richard","email":"","middleInitial":"B.","affiliations":[{"id":17786,"text":"Carleton University","active":true,"usgs":false},{"id":7029,"text":"Queen's University, Kingston, Ontario, Canada","active":true,"usgs":false},{"id":135,"text":"Biological Resources Division","active":false,"usgs":true},{"id":6987,"text":"U.S. Fish and Wildlife Sevice","active":true,"usgs":false}],"preferred":false,"id":680701,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70182997,"text":"70182997 - 1994 - Geology of Seward Peninsula and Saint Lawrence Island","interactions":[],"lastModifiedDate":"2018-05-07T21:11:28","indexId":"70182997","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"4","title":"Geology of Seward Peninsula and Saint Lawrence Island","docAbstract":"Seward Peninsula (Fig. 1) may be divided into two geologic terranes (Fig. 2) on the basis of stratigraphy, structure, and metamorphic history. The Seward terrane, an area 150 by 150 km in the central and eastern peninsula, is dominated by Precambrian(?) and early Paleozoic blueschist-, greenschist-, and amphibolite-facies schist and marble, and intruded by three suites of granitic rocks. The York terrane, roughly 100 by 75 km, occupies western Seward Peninsula and the Bering Straits region; it is composed of Ordovician, Silurian, Devonian, Mississippian, and possibly older limestone, argillaceous limestone, dolostone, and phyllite, which are cut by a suite of Late Cretaceous tin-bearing granites. The boundary between the Seward and York terranes is poorly exposed but is thought to be a major thrust fault because of its sinuous map trace, a discontinuity in metamorphic grade, and differences in stratigraphy across the boundary (Travis Hudson, oral communication, 1984). The boundary between the Seward terrane and the Yukon-Koyukuk province to the east is complicated by vertical faults (the Kugruk fault Zone of Sainsbury, 1974) and obscured by Cretaceous and Tertiary cover.
The Seward Peninsula heretofore was thought to consist largely of rocks of Precambrian age (Sainsbury, 1972, 1974, 1975; Hudson, 1977), Microfossil data, however, indicate that many of the rocks considered to be Precambrian are early Paleozoic in age (Till and others, 1986; Dumoulin and Harris, 1984; Dumoulin and Till, 1985; Till and others, 1983; Wandervoort, 1985). It is likely that Precambrian rocks are a minor part of the stratigraphy of the Seward Peninsula.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The geology of Alaska: Volume G-1 of Decade of North American Geology","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Geological Society of America","usgsCitation":"Till, A.B., and Dumoulin, J.A., 1994, Geology of Seward Peninsula and Saint Lawrence Island, chap. 4 of The geology of Alaska: Volume G-1 of Decade of North American Geology, v. G-1, p. 141-152.","productDescription":"12 p.","startPage":"141","endPage":"152","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":336410,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Saint Lawrence Island, Seward Peninsula","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -161,\n 64\n ],\n [\n -161,\n 67\n ],\n [\n -169,\n 67\n ],\n [\n -169,\n 64\n ],\n [\n -161,\n 64\n ]\n ]\n ]\n }\n },\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -172.3974609375,\n 62.85514553774182\n ],\n [\n -168.134765625,\n 62.85514553774182\n ],\n [\n -168.134765625,\n 63.93737246791484\n ],\n [\n -172.3974609375,\n 63.93737246791484\n ],\n [\n -172.3974609375,\n 62.85514553774182\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"G-1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"58b69a44e4b01ccd54ff3fd4","contributors":{"authors":[{"text":"Till, Alison B. atill@usgs.gov","contributorId":2482,"corporation":false,"usgs":true,"family":"Till","given":"Alison","email":"atill@usgs.gov","middleInitial":"B.","affiliations":[{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"preferred":true,"id":674743,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dumoulin, Julie A. 0000-0003-1754-1287 dumoulin@usgs.gov","orcid":"https://orcid.org/0000-0003-1754-1287","contributorId":203209,"corporation":false,"usgs":true,"family":"Dumoulin","given":"Julie","email":"dumoulin@usgs.gov","middleInitial":"A.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":119,"text":"Alaska Science Center Geology Minerals","active":true,"usgs":true}],"preferred":true,"id":674744,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":1827,"text":"wsp2381C - 1994 - Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987","interactions":[{"subject":{"id":19293,"text":"ofr91238 - 1992 - Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987","indexId":"ofr91238","publicationYear":"1992","noYear":false,"title":"Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987"},"predicate":"SUPERSEDED_BY","object":{"id":1827,"text":"wsp2381C - 1994 - Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987","indexId":"wsp2381C","publicationYear":"1994","noYear":false,"chapter":"C","title":"Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987"},"id":1}],"lastModifiedDate":"2020-04-30T18:36:16.248829","indexId":"wsp2381C","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":341,"text":"Water Supply Paper","code":"WSP","active":false,"publicationSubtype":{"id":5}},"seriesNumber":"2381","chapter":"C","title":"Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987","docAbstract":"Ground-water quality was assessed in a 5,000-square-mile area of the High Plains aquifer in south-central Kansas that is susceptible to nonpoint-source contamination from agricultural and petroleum-production activities. Of particular interest was the presence of agricultural chemicals and petroleum-derived hydrocarbons that might have been associated with brines that formerly were disposed into unlined ponds. \r\n\r\nRandom sampling of ground water was done within a framework of discrete land-use areas (irrigated cropland, petroleum-production land containing former brine-disposal ponds, and undeveloped rangeland) of 3-10 square miles. Although true baseline water-quality conditions probably are rare, in this region they are represented most closely by ground water in areas of undeveloped rangeland. The sampling design enabled statistical hypothesis testing, using nonparametric procedures, of the effects of land use, unsaturated-zone lithology, and type of well sampled. \r\n\r\nResults indicate that regional ground-water quality has been affected by prevailing land-use activities, as shown by increased concentrations of several inorganic constituents. Ground water beneath irrigated cropland was characterized by significantly larger concentrations of hardness, alkalinity, calcium, magnesium, potassium, fluofide, and nitrite plus nitrate than was water beneath undeveloped rangeland. Few nondegraded pesticides were detected in the aquifer, probably because of degradation and sorption. Atrazine was the most common, but only in small concentrations. round water beneath petroleum-production land was characterized by significantly larger concentrations of hardness, alkalinity, dissolved solids, sodium, and chloride than was water beneath undeveloped rangeland. Nonpoint-source contamination by oil-derived hydrocarbons was not discernible. The occurrences of trace organic compounds were similar between petroleum-production land and undeveloped rangeland, which indicates a natural origin for these compounds. \r\n\r\nThe unsaturated zone in the study area is lithologically heterogeneous and contains substantial amounts of clay that inhibit the downward movement of water and solutes. Within the aquifer, the rate of lateral regional flow and solute transport is slow enough so that the ground-water quality reflects overlying land use in discrete areas of several square miles, but it is still sufficiently rapid so that the type of well sampled is not important in regional characterizations of water quality beneath irrigated cropland; the seasonal pumping of irrigation wells does not appear to divert regional flow enough to cause substantial local anomalies of more mineralized ground water.","language":"English","publisher":"U.S. Geological Survey","doi":"10.3133/wsp2381C","usgsCitation":"Helgesen, J.O., Stullken, L.E., and Rutledge, A.T., 1994, Assessment of nonpoint-source contamination of the High Plains Aquifer in south-central Kansas, 1987: U.S. Geological Survey Water Supply Paper 2381, v, 51 p. , https://doi.org/10.3133/wsp2381C.","productDescription":"v, 51 p. ","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":137075,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/wsp/2381c/report-thumb.jpg"},{"id":27025,"rank":300,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/wsp/2381c/report.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","otherGeospatial":"South-central Kansas","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -101.700439453125,\n 36.98500309285596\n ],\n [\n -96.2841796875,\n 36.98500309285596\n ],\n [\n -96.2841796875,\n 38.8824811975508\n ],\n [\n -101.700439453125,\n 38.8824811975508\n ],\n [\n -101.700439453125,\n 36.98500309285596\n ]\n ]\n ]\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4abae4b07f02db671ef9","contributors":{"authors":[{"text":"Helgesen, John O.","contributorId":101630,"corporation":false,"usgs":true,"family":"Helgesen","given":"John","email":"","middleInitial":"O.","affiliations":[],"preferred":false,"id":144219,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stullken, Lloyd E.","contributorId":60609,"corporation":false,"usgs":true,"family":"Stullken","given":"Lloyd","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":144218,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rutledge, A. T.","contributorId":38532,"corporation":false,"usgs":true,"family":"Rutledge","given":"A.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":144217,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70182832,"text":"70182832 - 1994 - Geology of south-central Alaska","interactions":[],"lastModifiedDate":"2017-06-07T16:28:08","indexId":"70182832","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"10","title":"Geology of south-central Alaska","docAbstract":"South-central Alaska is defined as the region bounded by the Kuskokwim Mountains to the northwest, the basins north of the Alaska Range to the north, the Canadian border to the east, and the Chugach Mountains to the south (Fig. 1). This region, hereafter called the study area, includes the Alaska Range, the Wrangell, Nutzotin, and Talkeetna mountains, the Copper River and the Susitna basins, the northern flank of the Chugach Mountains, the Aleutian Range, and the Alaska Peninsula. This chapter describes and interprets the bedrock geology of the region, which consists mostly of a collage of Paleozoic and Mesozoic tectonostratigraphic terranes (hereafter referred to as terranes), Mesozoic flysch basin deposits, late Paleozoic and Mesozoic plutonic rocks, and younger late Mesozoic and Cenozoic sedimentary, volcanic, and plutonic rocks. Cited published sources and new data and interpretations of the authors are utilized for the descriptions and interpretations. The terranes, flysch basin deposits, and younger Mesozoic sedimentary, volcanic, and plutonic assemblages are described first in a general northwest to southeast order. Major faults or sutures are described second. Stratigraphic linkages and structural and tectonic relations between terranes are described last. Definitions of the various stratigraphic, structural, and tectonic terms are stated at the end of this introduction.
","largerWorkType":{"id":4,"text":"Book"},"largerWorkTitle":"The geology of Alaska: Volume G-1 of Decade of North American Geology","largerWorkSubtype":{"id":15,"text":"Monograph"},"language":"English","publisher":"Geological Society of America","usgsCitation":"Nokleberg, W.J., Plafker, G., and Wilson, F.H., 1994, Geology of south-central Alaska, chap. 10 of The geology of Alaska: Volume G-1 of Decade of North American Geology, v. 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","language":"English","publisher":"American Society of Ichthyologists and Herpetologists (ASIH)","doi":"10.2307/1447004","usgsCitation":"Nico, L., and Morales, M., 1994, Nutrient values of piranha (Characidae: Serrasalminae) prey items: Copeia, v. 1994, no. 2, p. 524-528, https://doi.org/10.2307/1447004.","productDescription":"5 p.","startPage":"524","endPage":"528","numberOfPages":"5","costCenters":[{"id":275,"text":"Florida Integrated Science Center","active":false,"usgs":true}],"links":[{"id":130740,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"1994","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4afce4b07f02db696726","contributors":{"authors":[{"text":"Nico, L.G. 0000-0002-4488-7737","orcid":"https://orcid.org/0000-0002-4488-7737","contributorId":83052,"corporation":false,"usgs":true,"family":"Nico","given":"L.G.","affiliations":[],"preferred":false,"id":317806,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Morales, M.","contributorId":75483,"corporation":false,"usgs":true,"family":"Morales","given":"M.","email":"","affiliations":[],"preferred":false,"id":317805,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":1008454,"text":"1008454 - 1994 - Agricultural chemical screening and detection of chlorpyrifos in fishes from the Apure drainage, Venezuela","interactions":[],"lastModifiedDate":"2012-02-02T00:04:24","indexId":"1008454","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1694,"text":"Fresenius Environmental Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Agricultural chemical screening and detection of chlorpyrifos in fishes from the Apure drainage, Venezuela","docAbstract":"Abstract not supplied at this time","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Fresenius Environmental Bulletin","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","usgsCitation":"Nico, L., Schaeffer, D., Taphorn, D., and Barbarino-Duque., A., 1994, Agricultural chemical screening and detection of chlorpyrifos in fishes from the Apure drainage, Venezuela: Fresenius Environmental Bulletin, v. 3, no. 11, p. 685-690.","productDescription":"p. 685-690","startPage":"685","endPage":"690","numberOfPages":"6","costCenters":[{"id":275,"text":"Florida Integrated Science Center","active":false,"usgs":true}],"links":[{"id":130741,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"3","issue":"11","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4ae3e4b07f02db689143","contributors":{"authors":[{"text":"Nico, L.G. 0000-0002-4488-7737","orcid":"https://orcid.org/0000-0002-4488-7737","contributorId":83052,"corporation":false,"usgs":true,"family":"Nico","given":"L.G.","affiliations":[],"preferred":false,"id":317810,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Schaeffer, D.J.","contributorId":65038,"corporation":false,"usgs":true,"family":"Schaeffer","given":"D.J.","email":"","affiliations":[],"preferred":false,"id":317808,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Taphorn, D.C.","contributorId":32480,"corporation":false,"usgs":true,"family":"Taphorn","given":"D.C.","email":"","affiliations":[],"preferred":false,"id":317807,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Barbarino-Duque., A.","contributorId":66638,"corporation":false,"usgs":true,"family":"Barbarino-Duque.","given":"A.","email":"","affiliations":[],"preferred":false,"id":317809,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":96760,"text":"96760 - 1994 - Study of an off-highway vehicle race in Eldorado Valley \"Twilight 200\" March 27, 1993","interactions":[],"lastModifiedDate":"2012-02-02T00:03:51","indexId":"96760","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":9,"text":"Other Report"},"title":"Study of an off-highway vehicle race in Eldorado Valley \"Twilight 200\" March 27, 1993","docAbstract":"No abstract available at this time","language":"English","collaboration":"Bureau of Land Management Draft Report.","usgsCitation":"Medica, P., 1994, Study of an off-highway vehicle race in Eldorado Valley \"Twilight 200\" March 27, 1993, 29 p.","productDescription":"29 p.","startPage":"29","numberOfPages":"29","costCenters":[{"id":651,"text":"Western Ecological Research Center","active":true,"usgs":true}],"links":[{"id":127001,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"4f4e4b05e4b07f02db699da7","contributors":{"authors":[{"text":"Medica, P.A.","contributorId":77079,"corporation":false,"usgs":true,"family":"Medica","given":"P.A.","email":"","affiliations":[],"preferred":false,"id":300210,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70182831,"text":"70182831 - 1994 - Geologic framework of the Aleutian arc, Alaska","interactions":[],"lastModifiedDate":"2018-01-08T12:43:16","indexId":"70182831","displayToPublicDate":"1994-01-01T00:00:00","publicationYear":"1994","noYear":false,"publicationType":{"id":5,"text":"Book chapter"},"publicationSubtype":{"id":24,"text":"Book Chapter"},"chapter":"11","title":"Geologic framework of the Aleutian arc, Alaska","docAbstract":"The Aleutian arc is the arcuate arrangement of mountain ranges and flanking submerged margins that forms the northern rim of the Pacific Basin from the Kamchatka Peninsula (Russia) eastward more than 3,000 km to Cooke Inlet (Fig. 1). It consists of two very different segments that meet near Unimak Pass: the Aleutian Ridge segment to the west and the Alaska Peninsula-the Kodiak Island segment to the east. The Aleutian Ridge segment is a massive, mostly submerged cordillera that includes both the islands and the submerged pedestal from which they protrude. The Alaska Peninsula-Kodiak Island segment is composed of the Alaska Peninsula, its adjacent islands, and their continental and insular margins. The Bering Sea margin north of the Alaska Peninsula consists mostly of a wide continental shelf, some of which is underlain by rocks correlative with those on the Alaska Peninsula.
There is no pre-Eocene record in rocks of the Aleutian Ridge segment, whereas rare fragments of Paleozoic rocks and extensive outcrops of Mesozoic rocks occur on the Alaska Peninsula. Since the late Eocene, and possibly since the early Eocene, the two segments have evolved somewhat similarly. Major plutonic and volcanic episodes, however, are not synchronous. Furthermore, uplift of the Alaska Peninsula-Kodiak Island segment in late Cenozoic time was more extensive than uplift of the Aleutian Ridge segment. It is probable that tectonic regimes along the Aleutian arc varied during the Tertiary in response to such factors as the directions and rates of convergence, to bathymetry and age of the subducting Pacific Plate, and to the volume of sediment in the Aleutian Trench.
The Pacific and North American lithospheric plates converge along the inner wall of the Aleutian trench at about 85 to 90 mm/yr. Convergence is nearly at right angles along the Alaska Peninsula, but because of the arcuate shape of the Aleutian Ridge relative to the location of the plates' poles of rotation, the angle of convergence lessens to the west (Minster and Jordan, 1978). Along the central Aleutian Ridge, underthrusting is about 30° from normal to the volcanic axis. Motion between plates is approximately parallel along the western Aleutian Ridge.
In this paper we briefly describe and interpret the Cenozoic evolution of the Aleutian arc by focusing on the onshore and offshore geologic frameworks in four of its sectors, two sectors each from the Aleutian Ridge and Alaska Peninsula-Kodiak Island segments (Fig. 1). We compare the geologic evolution of the segments and comment on the implications of some new, previously unpublished data.
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