Samples of stream sediments and aquatic mosses were collected from nine sites across several mineralized zones at the southeasternmost extension of the Idaho Cobalt Belt. Because the steepness of the terrain and the attendant high flow rate of the streams made it difficult to obtain adequate sediment samples, mosses were considered as an alternative sampling medium. The results not only showed that the Cu and Co content of the mosses correlated almost perfectly with that of the sediments, but that the contrast between samples taken from mineralized and background areas was greater in mosses, especially for Co. Maximum concentrations of 35,000 μg/g Cu and 2000 μg/g Co were observed in the ash of mosses, compared to maximum concentrations of 1700 μg/g and 320 μg/g, respectively, in the associated sediments. Species identification was considered unimportant, which should dispel some reluctance to use mosses in mineral exploration.
","language":"English","publisher":"Elsevier","doi":"10.1016/0375-6742(84)90091-8","issn":"03756742","usgsCitation":"Erdman, J.A., and Modreski, P., 1984, Copper and cobalt in aquatic mosses and stream sediments from the Idaho Cobalt Belt: Journal of Geochemical Exploration, v. 20, no. 1, p. 75-84, https://doi.org/10.1016/0375-6742(84)90091-8.","productDescription":"10 p.","startPage":"75","endPage":"84","numberOfPages":"10","costCenters":[],"links":[{"id":220366,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fbf6e4b0c8380cd4e05c","contributors":{"authors":[{"text":"Erdman, J. A.","contributorId":59786,"corporation":false,"usgs":true,"family":"Erdman","given":"J.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":365777,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Modreski, P.J.","contributorId":98335,"corporation":false,"usgs":true,"family":"Modreski","given":"P.J.","affiliations":[],"preferred":false,"id":365778,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013292,"text":"70013292 - 1984 - THERMAL-INERTIA MAPPING IN VEGETATED TERRAIN FROM HEAT CAPACITY MAPPING MISSION SATELLITE DATA.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:36","indexId":"70013292","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"THERMAL-INERTIA MAPPING IN VEGETATED TERRAIN FROM HEAT CAPACITY MAPPING MISSION SATELLITE DATA.","docAbstract":"Thermal-inertia data, derived from the Heat Capacity Mapping Mission (HCMM) satellite, were analyzed in areas of varying amounts of vegetation cover. Thermal differences which appear to correlate with lithologic differences have been observed previously in areas of substantial vegetation cover. However, the energy exchange occurring within the canopy is much more complex than that used to develop the methods employed to produce thermal-inertia images. Because adequate models are lacking at present, the interpretation is largely dependent on comparison, correlation, and inference. Two study areas were selected in the western United States: the Richfield, Utah and the Silver City, Arizona-New Mexico, 1 degree multiplied by 2 degree quadrangles. Many thermal-inertia highs were found to be associated with geologic-unit boundaries, faults, and ridges. Lows occur in valleys with residual soil cover.","conferenceTitle":"Proceedings of the International Symposium on Remote Sensing of Environment, Third Thematic Conference: Remote Sensing for Exploration Geology.","conferenceLocation":"Colorado Springs, CO, USA","language":"English","publisher":"Environmental Research Inst of Michigan","publisherLocation":"Ann Arbor, MI, USA","usgsCitation":"Watson, K., and Hummer-Miller, S., 1984, THERMAL-INERTIA MAPPING IN VEGETATED TERRAIN FROM HEAT CAPACITY MAPPING MISSION SATELLITE DATA., Proceedings of the International Symposium on Remote Sensing of Environment, Third Thematic Conference: Remote Sensing for Exploration Geology., Colorado Springs, CO, USA, p. 197-216.","startPage":"197","endPage":"216","numberOfPages":"20","costCenters":[],"links":[{"id":220138,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba389e4b08c986b31fd44","contributors":{"authors":[{"text":"Watson, Ken","contributorId":90317,"corporation":false,"usgs":true,"family":"Watson","given":"Ken","email":"","affiliations":[],"preferred":false,"id":365745,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hummer-Miller, Susanne","contributorId":38572,"corporation":false,"usgs":true,"family":"Hummer-Miller","given":"Susanne","email":"","affiliations":[],"preferred":false,"id":365744,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013288,"text":"70013288 - 1984 - The heat capacities of osumilite from 298.15 to 1000 K, the thermodynamic properties of two natural chlorites to 500 K, and the thermodynamic properties of petalite to 1800 K.","interactions":[],"lastModifiedDate":"2012-03-12T17:18:36","indexId":"70013288","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":738,"text":"American Mineralogist","active":true,"publicationSubtype":{"id":10}},"title":"The heat capacities of osumilite from 298.15 to 1000 K, the thermodynamic properties of two natural chlorites to 500 K, and the thermodynamic properties of petalite to 1800 K.","docAbstract":"Modifications to an automated low-T, adiabatic calorimeter are described. Thermodynamic data obtained with this instrument are reported for minerals from metamorphic terrains. (U.S. Bureau of Mines Report of Investigations 8451)-J.A.Z.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"American Mineralogist","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"0003004X","usgsCitation":"Hemingway, B.S., Robie, R.A., Kittrick, J., Grew, E., Nelen, J., and London, D., 1984, The heat capacities of osumilite from 298.15 to 1000 K, the thermodynamic properties of two natural chlorites to 500 K, and the thermodynamic properties of petalite to 1800 K.: American Mineralogist, v. 69, no. 7-8, p. 701-710.","startPage":"701","endPage":"710","numberOfPages":"10","costCenters":[],"links":[{"id":220085,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"69","issue":"7-8","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bacb2e4b08c986b32368c","contributors":{"authors":[{"text":"Hemingway, B. S.","contributorId":7268,"corporation":false,"usgs":true,"family":"Hemingway","given":"B.","email":"","middleInitial":"S.","affiliations":[],"preferred":false,"id":365731,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Robie, R. A.","contributorId":71237,"corporation":false,"usgs":true,"family":"Robie","given":"R.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":365735,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Kittrick, J.A.","contributorId":20893,"corporation":false,"usgs":true,"family":"Kittrick","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":365732,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Grew, E.S.","contributorId":31401,"corporation":false,"usgs":true,"family":"Grew","given":"E.S.","email":"","affiliations":[],"preferred":false,"id":365733,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Nelen, J.A.","contributorId":96821,"corporation":false,"usgs":true,"family":"Nelen","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":365736,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"London, D.","contributorId":61158,"corporation":false,"usgs":true,"family":"London","given":"D.","email":"","affiliations":[],"preferred":false,"id":365734,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70012873,"text":"70012873 - 1984 - A Model of Regional Ground-Water Flow in Secondary-Permeability Terrane","interactions":[],"lastModifiedDate":"2024-03-21T12:11:24.86057","indexId":"70012873","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3825,"text":"Groundwater","active":true,"publicationSubtype":{"id":10}},"title":"A Model of Regional Ground-Water Flow in Secondary-Permeability Terrane","docAbstract":"The ground-water flow system in the Lower Susquehanna River Basin in Pennsylvania and Maryland can be considered as one complex unconfined aquifer in which secondary porosity and permeability are the dominant influences on the occurrence and flow of ground water. The degree of development of secondary porosity and permeability in the various lithologies of the lower basin determines the aquifer characteristics of each lithology. Based on qualitative evidence, the use of a porous-media model was assumed to be appropriate on a regional scale and a finite-difference ground-water flow model was constructed for the lower basin.
The conceptual model of ground-water flow in the lower basin incorporates the major features of the flow system. Through the use of two layers, 21 hydrogeologic units, and five topographic settings, the conceptual model was systematically reduced to arrive at a simplified conceptual model. Further reduction produced a numerical model representation of the conceptual model, in which the essential features of the lower-basin flow system were quantified for input into the numerical model.
The model was calibrated under both steady-state and transient conditions, and was used to evaluate the water-supply potential of the 21 hydrogeologic units. The carbonate units have the greatest potential for ground-water development and the Triassic sedimentary and crystalline units have the least potential. A total ground-water yield potential of about 900 million gallons per day could be obtained from the lower basin with a consequent 50-percent reduction of base flow in streams.
Calculations were made of herring gull and common tern population recovery from potential oilspill damage in the U.S. mid-Atlantic Outer Continental Shelf (OCS) oil leasing area. Population recovery was examined using a density-dependent age-specific life history table for each species. Both a deterministic and a stochastic approach were used in the calculations. In the deterministic approach, it was assumed that an oilspill contact to a seabird colony had occurred. Using the density-dependent model, population recovery was calculated for several different mortality scenarios. Assuming that all age classes suffer 95% mortality from an oilspill contact, a worst case scenario, it was estimated that the herring gull and common tern populations could recover to their pre-spill levels in approximately 45 years and more than 100 years, respectively. In the stochastic approach, the probabilities of oilspill contacts to these seabird colonies were calculated using an oilspill trajectory analysis model. Oilspill contacts to these colonies were simulated during the expected 30 year active life of the lease area. For each lease lifetime, the number of oilspill contacts to a seabird colony was sampled from a Poisson distribution and assigned randomly on a seasonal basis. This analysis indicated that the oilspill risks from the development of proposed lease tracts in the mid-Atlantic region pose minimal risk (3–5%) of severe population reduction for both herring gulls and common terns. If the oilspill risks from tanker transportation of crude oil imports are included along with the proposed lease tracts, then the risks of severe population reduction are increased to approximately 10% for herring gulls and 18% for common terns.
","language":"English","publisher":"Elsevier","doi":"10.1016/0304-3800(84)90025-5","usgsCitation":"Samuels, W., and Ladino, A., 1984, Calculations of seabird population recovery from potential oilspills in the mid-Atlantic region of the United States: Ecological Modelling, v. 21, no. 1, p. 63-84, https://doi.org/10.1016/0304-3800(84)90025-5.","productDescription":"22 p.","startPage":"63","endPage":"84","numberOfPages":"22","costCenters":[],"links":[{"id":219970,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Mid-Atlantic region","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -75.78218772294734,\n 41.41847066117498\n ],\n [\n -76.9461477045258,\n 34.39258601480289\n ],\n [\n -71.60300062228816,\n 34.993219485756725\n ],\n [\n -71.60300062228816,\n 41.41847066117498\n ],\n [\n -75.78218772294734,\n 41.41847066117498\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"21","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f307e4b0c8380cd4b56f","contributors":{"authors":[{"text":"Samuels, William B.","contributorId":13238,"corporation":false,"usgs":true,"family":"Samuels","given":"William B.","affiliations":[],"preferred":false,"id":365709,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Ladino, A.","contributorId":6186,"corporation":false,"usgs":true,"family":"Ladino","given":"A.","email":"","affiliations":[],"preferred":false,"id":365708,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013274,"text":"70013274 - 1984 - Mineralogy and chemistry of massive sulfide deposits from the Juan de Fuca Ridge","interactions":[],"lastModifiedDate":"2024-01-03T01:16:04.658224","indexId":"70013274","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Mineralogy and chemistry of massive sulfide deposits from the Juan de Fuca Ridge","docAbstract":"Six hydrothermal vent sites and associated benthic communities were located in the axial valley of the southern Juan de Fuca Ridge using transponder-navigated bottom photography. The hydrothermal deposits form ledges and shallow mounds within a central zone characterized by a linear bathymetric depression and numerous collapse features. The flat valley floor adjacent to the central zone consists of ferrobasalt lobate flows and sheet flows; sediment cover is minimal. Vent sites are characterized by concentrations of tube worms, clams, benthic siphonophores, and several unidentified fauna.
Two types of massive sulfide were dredged from one of the vent sites. Type A samples are angular slabs of dark gray Zn-rich sulfide with interlayers and a thin, partly oxidized crust of Fe sulfide. These layered sulfide aggregates appear to be fragments of a sulfide wall enclosing an active hydrothermal vent. The outer sulfide wall is composed mainly of colloform Fe sulfide and Fe-poor sphalerite deposited under lower-temperature conditions whereby sea water and hydrothermal fluid mix above the discharge point. With continued sulfide deposition, the wall inhibits mixing of sea water and hydrothermal fluid. Inside the wall, the intensifying hydrothermal system deposits a higher-temperature assemblage of granular Fe-rich sphalerite, wurtzite, pyrite, and minor Cu-Fe sulfide. The zonation in wurtzite from Fe-rich cores to Fe-poor rims may result from a late-stage cooling of the hydrothermal fluid and(or) a change in fluid chemistry. The sulfide wall grows outward where a rupture in it permits the escape of high-temperature fluid and then deposition of a secondary shell over the breakthrough point. As temperature increases, earlier-formed minerals dissolve, and Zn, Fe, and Pb migrate toward the outer sulfide wall. Tube worms flourished in the outer wall of type A samples, and abandoned tube structures served as conduits for the late-stage hydrothermal fluids.
Type B sulfide samples are subrounded, spongy-textured fragments composed almost entirely of dendritic aggregates of pale, Fe-poor colloform sphalerite and opaline silica. This type of sulfide is deposited in open space by moderate- to low-temperature fluid discharging at a slow but variable rate; the fluid becomes increasingly oxidizing, resulting in late-stage deposition of hematite, barite, and sulfur. Type B samples show little evidence of burrowing animals; this type of sulfide may be deposited in settings peripheral to sites of focused discharge.
The chemical composition of ferromanganese nodules from the three nodule-bearing MANOP sites in the Pacific can be accounted for in a qualitative way by variable contributions of distinct accretionary processes. These accretionary modes are:
(1) hydrogenous, i.e., direct precipitation or accumulation of colloidal metal oxides in seawater,
(2) oxic diagenesis which refers to a variety of ferromanganese accretion processes occurring in oxic sediments; and
(3) suboxic diagenesis which results from reduction of Mn+4 by oxidation of organic matter in the sediments. Geochemical evidence suggests processes (1) and (2) occur at all three MANOP nodule-bearing sites, and process (3) occurs only at the hemipelagic site, H, which underlies the relatively productive waters of the eastern tropical Pacific.
A normative model quantitatively accounts for the variability observed in nearly all elements. Zn and Na, however, are not well explained by the three end-member model, and we suggest that an additional accretionary process results in greater variability in the abundances of these elements. Variable contributions from the three accretionary processes result in distinct top-bottom compositional differences at the three sites. Nodule tops from H are enriched in Ni, Cu, and Zn, instead of the more typical enrichments of these elements in nodule bottoms. In addition, elemental correlations typical of most pelagic nodules are reversed at site H.
The three accretionary processes result in distinct mineralogies. Hydrogenous precipitation produces δMnO2. Oxic diagenesis, however, produces Cu-Ni-rich todorokite, and suboxic diagenesis results in an unstable todorokite which transforms to a 7 Å phase (“birnessite”) upon dehydration. The presence of Cu and Ni as charge-balancing cations influence the stability of the todorokite structure. In the bottoms of H nodules, which accrete dominantly by suboxic diagenesis, Na+ and possibly Mn+2 provide much of the charge balance for the todorokite structure.
Limited growth rate data for H nodules suggest suboxic accretion is the fastest of the three processes, with rates at least 200 mm/106 yr. Oxic accretion is probably 10 times slower and hydrogenous 100 times slower. Since these rates predict more suboxic component in bulk nodules than is calculated by the normative analysis, we propose that suboxic accretion is a non-steady-state process. Variations in surface water productivity cause pulses of particulate flux to the sea floor which result in transient Mn reduction in the surface sediments and reprecipitation on nodule surfaces.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(84)90186-8","issn":"00167037","usgsCitation":"Dymond, J., Lyle, M., Finney, B., Piper, D., Murphy, K., Conard, R., and Pisias, N., 1984, Ferromanganese nodules from MANOP Sites H, S, and R-Control of mineralogical and chemical composition by multiple accretionary processes: Geochimica et Cosmochimica Acta, v. 48, no. 5, p. 931-949, https://doi.org/10.1016/0016-7037(84)90186-8.","productDescription":"19 p.","startPage":"931","endPage":"949","numberOfPages":"19","costCenters":[],"links":[{"id":220526,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0f87e4b0c8380cd53937","contributors":{"authors":[{"text":"Dymond, J.","contributorId":98461,"corporation":false,"usgs":true,"family":"Dymond","given":"J.","email":"","affiliations":[],"preferred":false,"id":365653,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lyle, M.","contributorId":40344,"corporation":false,"usgs":true,"family":"Lyle","given":"M.","email":"","affiliations":[],"preferred":false,"id":365649,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Finney, B.","contributorId":72125,"corporation":false,"usgs":true,"family":"Finney","given":"B.","affiliations":[],"preferred":false,"id":365651,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Piper, D.Z.","contributorId":34154,"corporation":false,"usgs":false,"family":"Piper","given":"D.Z.","email":"","affiliations":[],"preferred":false,"id":365648,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Murphy, K.","contributorId":89865,"corporation":false,"usgs":false,"family":"Murphy","given":"K.","email":"","affiliations":[],"preferred":false,"id":365652,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Conard, R.","contributorId":63531,"corporation":false,"usgs":true,"family":"Conard","given":"R.","email":"","affiliations":[],"preferred":false,"id":365650,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Pisias, N.","contributorId":25290,"corporation":false,"usgs":true,"family":"Pisias","given":"N.","affiliations":[],"preferred":false,"id":365647,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70013248,"text":"70013248 - 1984 - Proton and metal ion binding to natural organic polyelectrolytes—I. Studies with synthetic model compounds","interactions":[],"lastModifiedDate":"2025-03-19T15:12:24.909799","indexId":"70013248","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2958,"text":"Organic Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Proton and metal ion binding to natural organic polyelectrolytes—I. Studies with synthetic model compounds","docAbstract":"A unified physico-chemical model, based on a modified Henderson-Hasselbalch equation, for the analysis of ion complexation reactions involving charged polymeric systems is presented and verified. In this model pH = pKa+p(ΔKa) + log(α/1 − α) where Ka is the intrinsic acid dissociation constant of the ionizable functional groups on the polymer, ΔKa is the deviation of the intrinsic constant due to electrostatic interaction between the hydrogen ion and the polyanion, and alpha (α) is the polyacid degree of ionization. Using this approach pKa values for repeating acidic units of polyacrylic (PAA) and polymethacrylic (PMA) acids were found to be 4.25 ± 0.03 and 4.8 ± 0.1, respectively. The polyion electrostatic deviation term derived from the potentiometric titration data (i.e. p(ΔKa)) is used to calculate metal ion concentration at the complexation site on the surface of the polyanion. Intrinsic cobalt-polycarboxylate binding constants (7.5 for PAA and 5.6 for PMA), obtained using this procedure, are consistent with the range of published binding constants for cobalt-monomer carboxylate complexes. In two phase systems incorporation of a Donnan membrane potential term allows determination of the intrinsic pKa of a cross-linked PMA gel, pKa = 4.83, in excellent agreement with the value obtained for the linear polyelectrolyte and the monomer. Similarly, the intrinsic stability constant for cobalt ion binding to a PMA-gel (βCoPMA+ = 11) was found to be in agreement with the linear polyelectrolyte analogue and the published data for cobalt-carboxylate monodentate complexes.
","language":"English","publisher":"Elsevier","doi":"10.1016/0146-6380(84)90116-5","usgsCitation":"Marinsky, J., and Reddy, M., 1984, Proton and metal ion binding to natural organic polyelectrolytes—I. Studies with synthetic model compounds: Organic Geochemistry, v. 7, no. 3-4, p. 207-214, https://doi.org/10.1016/0146-6380(84)90116-5.","productDescription":"8 p.","startPage":"207","endPage":"214","costCenters":[],"links":[{"id":220418,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"7","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a8f94e4b0c8380cd7f844","contributors":{"authors":[{"text":"Marinsky, J.A.","contributorId":42706,"corporation":false,"usgs":true,"family":"Marinsky","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":365636,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Reddy, M.M.","contributorId":24363,"corporation":false,"usgs":true,"family":"Reddy","given":"M.M.","email":"","affiliations":[],"preferred":false,"id":365635,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70013245,"text":"70013245 - 1984 - Complexation of trace metals by adsorbed natural organic matter","interactions":[],"lastModifiedDate":"2020-01-19T11:49:28","indexId":"70013245","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Complexation of trace metals by adsorbed natural organic matter","docAbstract":"The adsorption behavior and solution speciation of Cu(II) and Cd(II) were studied in model systems containing colloidal alumina particles and dissolved natural organic matter. At equilibrium a significant fraction of the alumina surface was covered by adsorbed organic matter. Cu(II) was partitioned primarily between the surface-bound organic matter and dissolved Cu-organic complexes in the aqueous phase. Complexation of Cu2+ with the functional groups of adsorbed organic matter was stronger than complexation with uncovered alumina surface hydroxyls. It is shown that the complexation of Cu(II) by adsorbed organic matter can be described by an apparent stability constant approximately equal to the value found for solution phase equilibria. In contrast, Cd(II) adsorption was not significantly affected by the presence of organic matter at the surface, due to weak complex formation with the organic ligands. The results demonstrate that general models of trace element partitioning in natural waters must consider the presence of adsorbed organic matter.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(84)90095-4","issn":"00167037","usgsCitation":"Davis, J., 1984, Complexation of trace metals by adsorbed natural organic matter: Geochimica et Cosmochimica Acta, v. 48, no. 4, p. 679-691, https://doi.org/10.1016/0016-7037(84)90095-4.","productDescription":"13 p.","startPage":"679","endPage":"691","numberOfPages":"13","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":220415,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f911e4b0c8380cd4d3fb","contributors":{"authors":[{"text":"Davis, J.A.","contributorId":71694,"corporation":false,"usgs":true,"family":"Davis","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":365630,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70013225,"text":"70013225 - 1984 - Application of mineral-solution equilibria to geochemical exploration for sandstone-hosted uranium deposits in two basins in west central Utah","interactions":[],"lastModifiedDate":"2024-01-11T16:24:07.535841","indexId":"70013225","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","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":"Application of mineral-solution equilibria to geochemical exploration for sandstone-hosted uranium deposits in two basins in west central Utah","docAbstract":"A geochemical survey utilizing mainly ground waters was conducted in the Milford and Beaver basins. Waters were collected mainly from wells and springs at 100 sites and analyzed for major and minor elements. A computer model (WATEQ3) was used to calculate the redox potential and the state of saturation of the waters with respect to uraninite, coffinite, and other mineral phases. Several areas in the basins were shown to have ground-water environments of reducing redox potentials which are favorable for precipitation of reduced uranium minerals. In addition, the ground waters in some of these areas were shown to be saturated or near saturation with respect to uraninite and coffinite. These areas do not necessarily coincide with areas containing the highest concentrations of uranium in ground water. The methods described in this study for hydrogeochemical exploration for sandstone-hosted uranium deposits may have wide application, particularly throughout those filled basins in the western United States where nearby sources for uranium exist.
","language":"English","publisher":"Society of Economic Geologists","doi":"10.2113/gsecongeo.79.2.266","issn":"03610128","usgsCitation":"Miller, W.R., Wanty, R., and McHugh, J.B., 1984, Application of mineral-solution equilibria to geochemical exploration for sandstone-hosted uranium deposits in two basins in west central Utah: Economic Geology, v. 79, no. 2, p. 266-283, https://doi.org/10.2113/gsecongeo.79.2.266.","productDescription":"18 p.","startPage":"266","endPage":"283","numberOfPages":"18","costCenters":[],"links":[{"id":220133,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"79","issue":"2","noUsgsAuthors":false,"publicationDate":"1984-04-01","publicationStatus":"PW","scienceBaseUri":"5059eca7e4b0c8380cd493ec","contributors":{"authors":[{"text":"Miller, W. R.","contributorId":92239,"corporation":false,"usgs":true,"family":"Miller","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":365580,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wanty, R. B. 0000-0002-2063-6423","orcid":"https://orcid.org/0000-0002-2063-6423","contributorId":66704,"corporation":false,"usgs":true,"family":"Wanty","given":"R. B.","affiliations":[],"preferred":false,"id":365578,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McHugh, J. B.","contributorId":79462,"corporation":false,"usgs":true,"family":"McHugh","given":"J.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":365579,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70012837,"text":"70012837 - 1984 - Proton and metal ion binding to natural organic polyelectrolytes—II. Preliminary investigation with a peat and a humic acid","interactions":[],"lastModifiedDate":"2025-03-19T15:25:39.008455","indexId":"70012837","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2958,"text":"Organic Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Proton and metal ion binding to natural organic polyelectrolytes—II. Preliminary investigation with a peat and a humic acid","docAbstract":"We summarize here experimental studies of proton and metal ion binding to a peat and a humic acid. Data analysis is based on a unified physico-chemical model for reaction of simple ions with polyelectrolytes employing a modified Henderson-Hasselbalch equation. Peat exhibited an apparent intrinsic acid dissociation constant of 10−4.05, and an apparent intrinsic metal ion binding constant of: 400 for cadmium ion; 600 for zinc ion; 4000 for copper ion; 20000 for lead ion. A humic acid was found to have an apparent intrinsic proton binding constant of 10−2.6. Copper ion binding to this humic acid sample occurred at two types of sites. The first site exhibited reaction characteristics which were independent of solution pH and required the interaction of two ligands on the humic acid matrix to simultaneously complex with each copper ion. The second complex species is assumed to be a simple monodentate copper ion-carboxylate species with a stability constant of 18.
","language":"English","publisher":"Elsevier","doi":"10.1016/0146-6380(84)90117-7","usgsCitation":"Marinsky, J., and Reddy, M., 1984, Proton and metal ion binding to natural organic polyelectrolytes—II. Preliminary investigation with a peat and a humic acid: Organic Geochemistry, v. 7, no. 3-4, p. 215-221, https://doi.org/10.1016/0146-6380(84)90117-7.","productDescription":"7 p.","startPage":"215","endPage":"221","costCenters":[],"links":[{"id":222104,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"7","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a8f95e4b0c8380cd7f84a","contributors":{"authors":[{"text":"Marinsky, J.A.","contributorId":42706,"corporation":false,"usgs":true,"family":"Marinsky","given":"J.A.","email":"","affiliations":[],"preferred":false,"id":364643,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Reddy, M.M.","contributorId":24363,"corporation":false,"usgs":true,"family":"Reddy","given":"M.M.","email":"","affiliations":[],"preferred":false,"id":364642,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014069,"text":"70014069 - 1984 - The impact of uncertainties in hydrologic measurement on phosphorus budgets and empirical models for two Colorado reservoirs.","interactions":[],"lastModifiedDate":"2020-01-20T19:27:19","indexId":"70014069","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2620,"text":"Limnology and Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"The impact of uncertainties in hydrologic measurement on phosphorus budgets and empirical models for two Colorado reservoirs.","docAbstract":"Water budgets and related chemical budgets of aquatic ecosystems commonly are interpreted without reference to uncertainties resulting from errors of measurement. The importance of such uncertainties in the use and interpretation of the phosphorus budgets of two Colorado reservoirs was determined.
","language":"English","publisher":"American Society of Limnology and Oceanography","doi":"10.4319/lo.1984.29.2.0322","usgsCitation":"LaBaugh, J.W., and Winter, T.C., 1984, The impact of uncertainties in hydrologic measurement on phosphorus budgets and empirical models for two Colorado reservoirs.: Limnology and Oceanography, v. 29, no. 2, p. 322-339, https://doi.org/10.4319/lo.1984.29.2.0322.","productDescription":"18 p.","startPage":"322","endPage":"339","numberOfPages":"18","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":487234,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.4319/lo.1984.29.2.0322","text":"Publisher Index Page"},{"id":225490,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":267948,"type":{"id":11,"text":"Document"},"url":"https://www.aslo.org/lo/toc/vol_31/issue_3/0503.pdf"}],"country":"United States","state":"Colorado","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -108.9404296875,\n 36.98500309285596\n ],\n [\n -102.1728515625,\n 36.98500309285596\n ],\n [\n -102.1728515625,\n 40.94671366508002\n ],\n [\n -108.9404296875,\n 40.94671366508002\n ],\n [\n -108.9404296875,\n 36.98500309285596\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"29","issue":"2","noUsgsAuthors":false,"publicationDate":"2003-12-22","publicationStatus":"PW","scienceBaseUri":"505baceee4b08c986b323858","contributors":{"authors":[{"text":"LaBaugh, James W. 0000-0002-4112-2536 jlabaugh@usgs.gov","orcid":"https://orcid.org/0000-0002-4112-2536","contributorId":1311,"corporation":false,"usgs":true,"family":"LaBaugh","given":"James","email":"jlabaugh@usgs.gov","middleInitial":"W.","affiliations":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true},{"id":27111,"text":"National Water Quality Program","active":true,"usgs":true}],"preferred":true,"id":779853,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Winter, T. C.","contributorId":23485,"corporation":false,"usgs":true,"family":"Winter","given":"T.","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":367490,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014056,"text":"70014056 - 1984 - Illinois basin coal fly ashes. 2. Equilibria relationships and qualitative modeling of ash-water reactions","interactions":[],"lastModifiedDate":"2023-10-19T17:23:51.421075","indexId":"70014056","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Illinois basin coal fly ashes. 2. Equilibria relationships and qualitative modeling of ash-water reactions","docAbstract":"No abstract available.
","language":"English","publisher":"American Chemical Society","doi":"10.1021/es00128a004","issn":"0013936X","usgsCitation":"Roy, W.R., and Griffin, R.A., 1984, Illinois basin coal fly ashes. 2. Equilibria relationships and qualitative modeling of ash-water reactions: Environmental Science & Technology, v. 18, no. 10, p. 739-742, https://doi.org/10.1021/es00128a004.","productDescription":"4 p.","startPage":"739","endPage":"742","costCenters":[],"links":[{"id":225292,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Illinois, Indiana, Kentucky, Missouri, Tennessee","otherGeospatial":"Illinois Basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -90.94649110420269,\n 40.945533770994814\n ],\n [\n -91.01923715797412,\n 40.712913517710376\n ],\n [\n -91.22300927118468,\n 40.47071651056973\n ],\n [\n -91.41792172729808,\n 40.222918700669254\n ],\n [\n -91.28502687085656,\n 39.7681702017654\n ],\n [\n -90.79774573057107,\n 39.45420363658053\n ],\n [\n -90.62941224574531,\n 39.25553699851744\n ],\n [\n -90.55853498897685,\n 38.959923461105575\n ],\n [\n -90.328183904478,\n 38.46910799598123\n ],\n [\n -90.3016049331897,\n 38.163251672370905\n ],\n [\n -89.92949933515392,\n 37.73709284258358\n ],\n [\n -89.47765682325267,\n 37.30141954814219\n ],\n [\n -88.45879625720158,\n 36.771003683292534\n ],\n [\n -88.06128362363084,\n 36.46534298077414\n ],\n [\n -87.41452865561605,\n 36.2584404443587\n ],\n [\n -86.79435265888903,\n 36.17266480846129\n ],\n [\n -86.20961529054678,\n 36.12974173785966\n ],\n [\n -85.79321140703031,\n 36.20126713508451\n ],\n [\n -85.35908820932148,\n 36.52232268256964\n ],\n [\n -84.93382466870852,\n 36.87040741796726\n ],\n [\n -84.64145598453713,\n 36.99080289010317\n ],\n [\n -84.66803495582546,\n 37.329715216866006\n ],\n [\n -84.8452280977477,\n 37.50562959256645\n ],\n [\n -85.26163198126414,\n 37.73019645188518\n ],\n [\n -85.3945268377057,\n 37.98202253429302\n ],\n [\n -85.67803586478078,\n 38.29825431846086\n ],\n [\n -85.74891312154978,\n 39.37479374147429\n ],\n [\n -86.07672043410541,\n 40.19178310943852\n ],\n [\n -86.68803677373594,\n 40.56298939507266\n ],\n [\n -87.52666346510904,\n 40.831671960797564\n ],\n [\n -87.7215759212231,\n 40.9388414414546\n ],\n [\n -88.2442956898928,\n 41.29925627633486\n ],\n [\n -88.50122574567995,\n 41.65769036462953\n ],\n [\n -89.06824379982982,\n 41.86915981369222\n ],\n [\n -89.50236699753867,\n 41.8757570021325\n ],\n [\n -89.99850779492006,\n 41.743683882396056\n ],\n [\n -90.45035030682129,\n 41.55169435710624\n ],\n [\n -90.62754344874298,\n 41.47872111301615\n ],\n [\n -91.04394733225999,\n 41.42559799520316\n ],\n [\n -91.12368424612491,\n 41.23932460147384\n ],\n [\n -90.9553507612986,\n 41.10594618764017\n ],\n [\n -90.94649110420269,\n 40.945533770994814\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"18","issue":"10","noUsgsAuthors":false,"publicationDate":"2002-05-01","publicationStatus":"PW","scienceBaseUri":"505a386de4b0c8380cd61579","contributors":{"authors":[{"text":"Roy, William R.","contributorId":45454,"corporation":false,"usgs":true,"family":"Roy","given":"William","middleInitial":"R.","affiliations":[],"preferred":false,"id":367464,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Griffin, R. A.","contributorId":46211,"corporation":false,"usgs":true,"family":"Griffin","given":"R.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":367465,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014030,"text":"70014030 - 1984 - Mineral resources of the Atlantic Exclusive Economic Zone","interactions":[],"lastModifiedDate":"2018-03-13T16:55:58","indexId":"70014030","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"Mineral resources of the Atlantic Exclusive Economic Zone","docAbstract":"Potential mineral resources of the Atlantic Exclusive Economic Zone (including the Gulf of Mexico and US Caribbean areas) include petroleum, sand and gravel, phosphorite, placer deposits of heavy mineral sands, ferromanganese nodules, and fresh water. Although major efforts have been made to search for petroleum, the oil and gas resources of the region are well known only in the western Gulf Shelf and more exploration is under way. Heavy-mineral placer deposits, which may be sources of titanium, gold, rare earths, etc. , have been sampled, but the extent and, therefore, economic value of the deposits have not been identified. Sand and gravel, phosphorite, and ferromanganese nodules all are represented by fairly well established deposits, and only modified market conditions would be necessary to cause detailed exploration and mining.","largerWorkTitle":"Oceans Conference Record (IEEE)","conferenceTitle":"Oceans '84 Conference & Exposition, Conference Record: Industry, Government, Education, Designs for the Future.","conferenceLocation":"Washington, DC, USA","language":"English","publisher":"IEEE","publisherLocation":"New York, NY, USA","issn":"01977385","usgsCitation":"Dillon, W.P., 1984, Mineral resources of the Atlantic Exclusive Economic Zone, in Oceans Conference Record (IEEE), Washington, DC, USA, p. 431-437.","productDescription":"7 p.","startPage":"431","endPage":"437","costCenters":[],"links":[{"id":225995,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a4acbe4b0c8380cd6905b","contributors":{"authors":[{"text":"Dillon, William P. bdillon@usgs.gov","contributorId":79820,"corporation":false,"usgs":true,"family":"Dillon","given":"William","email":"bdillon@usgs.gov","middleInitial":"P.","affiliations":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":367416,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70014022,"text":"70014022 - 1984 - Optimization of electrothermal atomization parameters for simultaneous multielement atomic absorption spectrometry","interactions":[],"lastModifiedDate":"2023-03-10T17:01:58.649487","indexId":"70014022","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":761,"text":"Analytical Chemistry","active":true,"publicationSubtype":{"id":10}},"title":"Optimization of electrothermal atomization parameters for simultaneous multielement atomic absorption spectrometry","docAbstract":"The effect of the acid matrix, the measurement mode (height or area), the atomizer surface (unpyrolyzed and pyrolyzed graphite), the atomization mode (from the wall or from a platform), and the atomization temperature on the simultaneous electrothermal atomization of Co, Cr, Cu, Fe, Mn, Mo, Ni, V, and Zn was examined. The 5% HNO3 matrix gave rise to severe irreproducibility using a pyrolyzed tube unless the tube was properly \"prepared\". The 5% HCl matrix did not exhibit this problem, and no problems were observed with either matrix using an unpyrolized tube or a pyrolyzed platform. The 5% HCl matrix gave better sensitivities with a pyrolyzed tube but the two matrices were comparable for atomization from a platform. If Mo and V are to be analyzed with the other seven elements, a high atomization temperature (2700??C or greater) is necessary regardless of the matrix, the measurement mode, the atomization mode, or the atomizer surface. Simultaneous detection limits (peak height with pyrolyzed tube atomization) were comparable to those of conventional atomic absorption spectrometry using electrothermal atomization above 280 nm. Accuracies and precisions of ??10-15% were found in the 10 to 120 ng mL-1 range for the analysis of NBS acidified water standards.","language":"English","publisher":"ACS Publications","doi":"10.1021/ac00265a014","usgsCitation":"Harnly, J.M., and Kane, J., 1984, Optimization of electrothermal atomization parameters for simultaneous multielement atomic absorption spectrometry: Analytical Chemistry, v. 56, no. 1, p. 48-54, https://doi.org/10.1021/ac00265a014.","productDescription":"7 p.","startPage":"48","endPage":"54","numberOfPages":"7","costCenters":[],"links":[{"id":225866,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"56","issue":"1","noUsgsAuthors":false,"publicationDate":"2002-05-01","publicationStatus":"PW","scienceBaseUri":"505a6ef2e4b0c8380cd7589f","contributors":{"authors":[{"text":"Harnly, J. M.","contributorId":22492,"corporation":false,"usgs":false,"family":"Harnly","given":"J.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":367397,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kane, Jean S.","contributorId":66544,"corporation":false,"usgs":true,"family":"Kane","given":"Jean S.","affiliations":[],"preferred":false,"id":367398,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014019,"text":"70014019 - 1984 - The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91°C, the association constants of SrHCO+3(aq) and SrCO03(aq) between 5 and 80°C, and an evaluation of the thermodynamic properties of Sr2+(aq) and SrCO3(cr) at 25°C and 1 atm total pressure","interactions":[],"lastModifiedDate":"2018-03-21T15:10:16","indexId":"70014019","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91°C, the association constants of SrHCO+3(aq) and SrCO03(aq) between 5 and 80°C, and an evaluation of the thermodynamic properties of Sr2+(aq) and SrCO3(cr) at 25°C and 1 atm total pressure","docAbstract":"Seventy new measurements (SrT-Pco2 of the solubility of strontianite were used to evaluate the equilibrium constant for the reaction SrCO3(cr) = Sr2+(aq) + CO2−3(aq) between 2 and 91 °C. The temperature dependence of the equilibrium constant is given by the expression Log K = 155.0305 − 7239.594/T − 56.58638 log T where T is in degrees Kelvin. The log K of strontianite, the Gibbs energy, enthalpy and entropy of the reaction at 25°C are −9.271 ± 0.020, 52.919 ± 0.08 kJ · mol−1, −1.67 ± 1.30 kJ · mol−1, and −183.1 ± 4.0 J · mol−1 · K−1, respectively. The equilibrium constants are consistent with an aqueous model that includes the ion pairs SrHCO+3(aq) and SrCO03(aq) which were evaluated by potentiometric methods between 5 and 80°C. The equilibrium constant for the association reaction Sr2+(aq) + HCO−3(aq) =SrHCO+3aq) is given by the expression Log KSrHCO+3 = −3.248 + 0.014867T. The log of the association constant, the Gibbs energy, enthalpy and entropy of the reaction at 25°C are 1.18, −6.76 kJ · mol−1, 25.30 kJ · mol−1, and 107.5 J · mol−1 · K−1, respectively. The equilibrium constant for the association reaction Sr2+(aq) + CO2−3(aq) = SrCO03aq) is given by the expression Log KSrCO03 = −1.019 + 0.012826T. The log of the association constant, the Gibbs energy, enthalpy, and entropy of the reaction at 25°C are 2.81, −16.01 kJ · mol−1,21.83 kJ · mol−1, and 126.9 J · mol−1 · K−1, respectively. These results lead to reliable calculation of the aqueous speciation and solubility of strontianite in the system SrCO3-CO2-H2O from 0 to more than 90°C. Literature data on the solubility of strontianite have been evaluated and compared with these results.
\nOur new data for strontianite have been used in an evaluation of the thermodynamic properties of Sr2+(aq), SrCO3(cr) and related compounds. The following values are recommended for the standard enthalpy (kJ · mol−1), Gibbs energy (kJ · mol−1), and entropy (J · mol−1 · K−1), respectively, of Sr2+aq): −550.90 ± 0.50, −563.83 ± 0.8 and −31.50 ± 2.0, and for SrCO3(cr): −1225.77 ± 1.1, −1144.73 ± 1.0 and 97.2.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(84)90383-1","issn":"00167037","usgsCitation":"Busenberg, E., Plummer, N., and Parker, V.B., 1984, The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91°C, the association constants of SrHCO+3(aq) and SrCO03(aq) between 5 and 80°C, and an evaluation of the thermodynamic properties of Sr2+(aq) and SrCO3(cr) at 25°C and 1 atm total pressure: Geochimica et Cosmochimica Acta, v. 48, no. 10, p. 2021-2035, https://doi.org/10.1016/0016-7037(84)90383-1.","productDescription":"15 p.","startPage":"2021","endPage":"2035","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":225811,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"10","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb043e4b08c986b324d43","contributors":{"authors":[{"text":"Busenberg, Eurybiades ebusenbe@usgs.gov","contributorId":2271,"corporation":false,"usgs":true,"family":"Busenberg","given":"Eurybiades","email":"ebusenbe@usgs.gov","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":367389,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Plummer, Niel 0000-0002-4020-1013 nplummer@usgs.gov","orcid":"https://orcid.org/0000-0002-4020-1013","contributorId":190100,"corporation":false,"usgs":true,"family":"Plummer","given":"Niel","email":"nplummer@usgs.gov","affiliations":[{"id":436,"text":"National Research Program - Eastern Branch","active":true,"usgs":true}],"preferred":true,"id":367390,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Parker, Vivian B.","contributorId":19713,"corporation":false,"usgs":true,"family":"Parker","given":"Vivian","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":367388,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014073,"text":"70014073 - 1984 - Pegmatite/wallrock interactions, Black Hills, South Dakota: Progressive boron metasomatism adjacent to the Tip Top pegmatite","interactions":[],"lastModifiedDate":"2024-03-19T16:27:24.961616","indexId":"70014073","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"Pegmatite/wallrock interactions, Black Hills, South Dakota: Progressive boron metasomatism adjacent to the Tip Top pegmatite","docAbstract":"Interaction between country rock and fluids derived from the Tip Top pegmatite has resulted in a series of boron enriched assemblages. Between unaltered quartz-mica schist to the pegmatite contact is a succession of four mineral assemblages:
(1) Quartz-Biotite-Potassium Feldspar assemblage (Q-B-K), which consists essentially of the original metamorphic silicate assemblage plus anomalously high amounts of modal tourmaline
(2) Quartz-Biotite-Tourmaline assemblage (Q-B-T)
(3) Tourmaline-Quartz-Muscovite assemblage (T-Q-M)
(4) Tourmaline-Quartz assemblage (T-Q). Alkali elements (Cs, Rb, K, Li), SiO2, and Ba show a decrease from the Q-B-K assemblage to the T-Q assemblage. A12O3, Ga, B, total Fe and Zn increase moderately from the Q-B-K assemblage to the T-Q assemblage.
The mineral chemistries also change considerably. The Mg/(Mg + Fe2+) ratios in biotites range from 0.54 to 0.50 in samples from the Q-B-K assemblage to 0.39 in the (Q-B-T) assemblage. The range in tourmaline end-member components from the Q-B-K assemblage to the T-Q assemblage is as follows: Q-B-K: Dravite.63 Schorl.23 Elbaite.05 Buergerite.09 T-Q: Dravite.23 Schorl.37 Elbaite.17 Buergerite.23.
Observed variations in mineral assemblage and whole rock chemistry within the alteration zone appear to a first approximation to be a function of μB2O3 (boron metasomatism) and μK2O (alkali leaching). The breakdown of feldspar and biotite may be approximated by reactions: 2HCl + 2(K, Na)AlSi3O8 /ai 2(K, Na)Cl + Al2SiO5 + 5SiO2 + H2O and 2 Annite + SiO2 + 5Al2SiO5 + 2NaCl + 6H3BO3 /ai 2 Tourmaline + 2KCl + 7H2O.
The alteration zone may represent either a single episode (B-, Cs-, Li-, Rb-enriched fluid) or multiple episodes (B, Zn, Mn fluid and Cs, Li, Rb fluid) of pegmatite fluid-schist interactions. In both situations, B in the aqueous fluid from the pegmatite reacts with the schist breaking down sheet silicate “traps” for Cs, Rb, Li, and K and forming tourmaline-rich assemblages.
","language":"English","publisher":"Elsevier","doi":"10.1016/0016-7037(84)90306-5","issn":"00167037","usgsCitation":"Shearer, C., Papike, J.J., Simon, S., Laul, J., and Christian, R., 1984, Pegmatite/wallrock interactions, Black Hills, South Dakota: Progressive boron metasomatism adjacent to the Tip Top pegmatite: Geochimica et Cosmochimica Acta, v. 48, no. 12, p. 2563-2579, https://doi.org/10.1016/0016-7037(84)90306-5.","productDescription":"17 p.","startPage":"2563","endPage":"2579","numberOfPages":"17","costCenters":[],"links":[{"id":225618,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"48","issue":"12","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7634e4b0c8380cd77fab","contributors":{"authors":[{"text":"Shearer, C.K.","contributorId":53537,"corporation":false,"usgs":true,"family":"Shearer","given":"C.K.","email":"","affiliations":[],"preferred":false,"id":367500,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Papike, J. J.","contributorId":18488,"corporation":false,"usgs":true,"family":"Papike","given":"J.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":367497,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Simon, S.B.","contributorId":31533,"corporation":false,"usgs":true,"family":"Simon","given":"S.B.","email":"","affiliations":[],"preferred":false,"id":367498,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Laul, J.C.","contributorId":90047,"corporation":false,"usgs":true,"family":"Laul","given":"J.C.","email":"","affiliations":[],"preferred":false,"id":367501,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Christian, R.P.","contributorId":51313,"corporation":false,"usgs":true,"family":"Christian","given":"R.P.","email":"","affiliations":[],"preferred":false,"id":367499,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70014075,"text":"70014075 - 1984 - Numerical noise in ocean and estuarine models","interactions":[],"lastModifiedDate":"2023-02-01T17:35:04.891554","indexId":"70014075","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":664,"text":"Advances in Water Resources","active":true,"publicationSubtype":{"id":10}},"title":"Numerical noise in ocean and estuarine models","docAbstract":"Approximate methods for solving the shallow water equations may lead to solutions exhibiting large fictitious, numerically-induced oscillations. The analysis of the discrete dispersion relation and modal solutions of small wavelengths provides a powerful technique for assessing the sensitivity of alternative numerical schemes to irregular data which may lead to such oscillatory numerical noise. For those schemes where phase speed vanishes at a finite wavenumber or there are multiple roots for wavenumber, oscillation modes can exist which are uncoupled from the dynamics of the problem. The discrete modal analysis approach is used here to identify two classes of spurious oscillation modes associated respectively with the two different asymptotic limits corresponding to estuarine and large scale ocean models. The analysis provides further insight into recent numerical results for models which include large spatial scales and Coriolis acceleration.
","language":"English","publisher":"Elsevier","doi":"10.1016/0309-1708(84)90025-3","usgsCitation":"Walters, R., and Carey, G.F., 1984, Numerical noise in ocean and estuarine models: Advances in Water Resources, v. 7, no. 1, p. 15-20, https://doi.org/10.1016/0309-1708(84)90025-3.","productDescription":"6 p.","startPage":"15","endPage":"20","numberOfPages":"6","costCenters":[],"links":[{"id":225620,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"7","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a6905e4b0c8380cd73b15","contributors":{"authors":[{"text":"Walters, R.","contributorId":84088,"corporation":false,"usgs":true,"family":"Walters","given":"R.","affiliations":[],"preferred":false,"id":367506,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Carey, G. F.","contributorId":86106,"corporation":false,"usgs":true,"family":"Carey","given":"G.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":367507,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014011,"text":"70014011 - 1984 - Geology of El Chichon volcano, Chiapas, Mexico","interactions":[],"lastModifiedDate":"2012-03-12T17:19:36","indexId":"70014011","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2499,"text":"Journal of Volcanology and Geothermal Research","active":true,"publicationSubtype":{"id":10}},"title":"Geology of El Chichon volcano, Chiapas, Mexico","docAbstract":"The (pre-1982) 850-m-high andesitic stratovolcano El Chicho??n, active during Pleistocene and Holocene time, is located in rugged, densely forested terrain in northcentral Chiapas, Me??xico. The nearest neighboring Holocene volcanoes are 275 km and 200 km to the southeast and northwest, respectively. El Chicho??n is built on Tertiary siltstone and sandstone, underlain by Cretaceous dolomitic limestone; a 4-km-deep bore hole near the east base of the volcano penetrated this limestone and continued 770 m into a sequence of Jurassic or Cretaceous evaporitic anhydrite and halite. The basement rocks are folded into generally northwest-trending anticlines and synclines. El Chicho??n is built over a small dome-like structure superposed on a syncline, and this structure may reflect cumulative deformation related to growth of a crustal magma reservoir beneath the volcano. The cone of El Chicho??n consists almost entirely of pyroclastic rocks. The pre-1982 cone is marked by a 1200-m-diameter (explosion?) crater on the southwest flank and a 1600-m-diameter crater apparently of similar origin at the summit, a lava dome partly fills each crater. The timing of cone and dome growth is poorly known. Field evidence indicates that the flank dome is older than the summit dome, and K-Ar ages from samples high on the cone suggest that the flank dome is older than about 276,000 years. At least three pyroclastic eruptions have occurred during the past 1250 radiocarbon years. Nearly all of the pyroclastic and dome rocks are moderately to highly porphyritic andesite, with plagioclase, hornblende and clinopyroxene the most common phenocrysts. Geologists who mapped El Chicho??n in 1980 and 1981 warned that the volcano posed a substantial hazard to the surrounding region. This warning was proven to be prophetic by violent eruptions that occurred in March and April of 1982. These eruptions blasted away nearly all of the summit dome, blanketed the surrounding region with tephra, and sent pyroclastic flows down radial drainages on the flanks of the cone; about 0.3 km3 of material (density of all products normalized to 2.6 g cm-3) was erupted. More debris entered the stratosphere than from any other volcanic eruption within at least the past two decades. Halite and a calcium sulfate mineral (anhydrite?) recovered from the stratospheric cloud, and anhydrite as a common accessory mineral in 1982 juvenile erupted products may reflect contamination of El Chicho??n magma by the evaporite sequence revealed by drilling. ?? 1984.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Volcanology and Geothermal Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","issn":"03770273","usgsCitation":"Duffield, W.A., Tilling, R., and Canul, R., 1984, Geology of El Chichon volcano, Chiapas, Mexico: Journal of Volcanology and Geothermal Research, v. 20, no. 1-2, p. 117-132.","startPage":"117","endPage":"132","numberOfPages":"16","costCenters":[],"links":[{"id":225678,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"20","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a2488e4b0c8380cd5818c","contributors":{"authors":[{"text":"Duffield, W. A.","contributorId":71935,"corporation":false,"usgs":true,"family":"Duffield","given":"W.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":367366,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Tilling, R.I. 0000-0003-4263-7221","orcid":"https://orcid.org/0000-0003-4263-7221","contributorId":98311,"corporation":false,"usgs":true,"family":"Tilling","given":"R.I.","affiliations":[],"preferred":false,"id":367367,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Canul, R.","contributorId":31532,"corporation":false,"usgs":true,"family":"Canul","given":"R.","email":"","affiliations":[],"preferred":false,"id":367365,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70014005,"text":"70014005 - 1984 - Carbon isotope fractionation of sapropelic organic matter during early diagenesis","interactions":[],"lastModifiedDate":"2025-03-17T16:09:54.078708","indexId":"70014005","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2958,"text":"Organic Geochemistry","active":true,"publicationSubtype":{"id":10}},"title":"Carbon isotope fractionation of sapropelic organic matter during early diagenesis","docAbstract":"Study of an algal, sapropelic sediment from Mangrove Lake, Bermuda shows that the mass balance of carbon and stable carbon isotopes in the major organic constituents is accounted for by a relatively straightforward model of selective preservation during diagenesis. The loss of 13C-enriched carbohydrates is the principal factor controlling the intermolecular mass balance of 13C in the sapropel. Results indicate that labile components are decomposed leaving as a residual concentrate in the sediment an insoluble humic substance that may be an original biochemical component of algae and associated bacteria. An overall decrease of up to about 4‰ in the δ 13C values of the organic matter is observed as a result of early diagenesis.
","language":"English","publisher":"Elsevier","doi":"10.1016/0146-6380(84)90016-0","usgsCitation":"Spiker, E.C., and Hatcher, P.G., 1984, Carbon isotope fractionation of sapropelic organic matter during early diagenesis: Organic Geochemistry, v. 5, no. 4, p. 283-290, https://doi.org/10.1016/0146-6380(84)90016-0.","productDescription":"8 p.","startPage":"283","endPage":"290","costCenters":[],"links":[{"id":225550,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Bermuda","otherGeospatial":"Mangrove Lake","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -64.74165211543514,\n 32.345696412628826\n ],\n [\n -64.74165211543514,\n 32.32102617325248\n ],\n [\n -64.70426092644328,\n 32.32102617325248\n ],\n [\n -64.70426092644328,\n 32.345696412628826\n ],\n [\n -64.74165211543514,\n 32.345696412628826\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"5","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f366e4b0c8380cd4b7a0","contributors":{"authors":[{"text":"Spiker, Elliott C.","contributorId":50174,"corporation":false,"usgs":true,"family":"Spiker","given":"Elliott","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":367355,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hatcher, Patrick G.","contributorId":93625,"corporation":false,"usgs":true,"family":"Hatcher","given":"Patrick","email":"","middleInitial":"G.","affiliations":[],"preferred":false,"id":367354,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014082,"text":"70014082 - 1984 - TECHNIQUE FOR ENHANCING DIGITAL COLOR IMAGES BY CONTRAST STRETCHING IN MUNSELL COLOR SPACE.","interactions":[],"lastModifiedDate":"2012-03-12T17:19:36","indexId":"70014082","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":24,"text":"Conference Paper"},"publicationSubtype":{"id":19,"text":"Conference Paper"},"title":"TECHNIQUE FOR ENHANCING DIGITAL COLOR IMAGES BY CONTRAST STRETCHING IN MUNSELL COLOR SPACE.","docAbstract":"The Munsell color system can be used to further enhance the appearance of high-quality digital color-composite images. A color-balanced 'standard' color-composite image is first produced using any desired contrast stretching algorithm. The stretched digital data are then transformed into the cylindrical Munsell color space. An enhanced version of a color-composite image is produced by stretching the saturation parameter over the full digital range and inverting the modified Munsell coordinates to red-blue-green (tristimulus) data space. The resulting image has greater color-saturation contrast than the original image, without hue change. Contrast stretching in Munsell color space reduces the correlation between individual bands or ratios and is similar to decorrelation processing based on principal-components transforms. However, principal components are based on data variance, with less variance being explained by each higher order component.","conferenceTitle":"Proceedings of the International Symposium on Remote Sensing of Environment, Third Thematic Conference: Remote Sensing for Exploration Geology.","conferenceLocation":"Colorado Springs, CO, USA","language":"English","publisher":"Environmental Research Inst of Michigan","publisherLocation":"Ann Arbor, MI, USA","usgsCitation":"Kruse, F.A., and Raines, G.L., 1984, TECHNIQUE FOR ENHANCING DIGITAL COLOR IMAGES BY CONTRAST STRETCHING IN MUNSELL COLOR SPACE., Proceedings of the International Symposium on Remote Sensing of Environment, Third Thematic Conference: Remote Sensing for Exploration Geology., Colorado Springs, CO, USA, p. 755-760.","startPage":"755","endPage":"760","numberOfPages":"6","costCenters":[],"links":[{"id":225751,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba37be4b08c986b31fd05","contributors":{"authors":[{"text":"Kruse, Fred A.","contributorId":26811,"corporation":false,"usgs":true,"family":"Kruse","given":"Fred","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":367525,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Raines, Gary L.","contributorId":48162,"corporation":false,"usgs":true,"family":"Raines","given":"Gary","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":367526,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70014000,"text":"70014000 - 1984 - Glacier mass balance and runoff research in the U.S.A.","interactions":[],"lastModifiedDate":"2023-12-19T00:49:29.152399","indexId":"70014000","displayToPublicDate":"1984-01-01T00:00:00","publicationYear":"1984","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1767,"text":"Geografiska Annaler, Series A","active":true,"publicationSubtype":{"id":10}},"title":"Glacier mass balance and runoff research in the U.S.A.","docAbstract":"Research on glacier mass balance began in the U.S.A. about 50 years ago. More complete studies of climate, snow and ice balance, and the hydrology of glaciers were initiated for the IGY in 1957 and the IHD in 1966. Investigations included the magnitude and geographic distribution of normal mass balance processes and unusual phenomena such as out-bursting, accumulation of ice by freezing of water in firn, and ablation of glacier ice by volcanic activity and by calving. Glacier size has been found not to be a simple function of climate as is widely imagined. Glaciers can increase with a warming of climate and can shrink due to calving instability mechanisms. Numerical modeling of glacier balance and runoff have appeared in the past decade only. Glacier research has also produced a new understanding of the nation's climate, water resources, and flood hazards because glaciers exist in very moist rather than very cold climates and produce very high runoff rates.
Sr, Nd, and Pb isotope ratios for a representative suite of 15 basanites, alkali basalts, transitional basalts and tholeiites from Loihi Seamount, Hawaii, display unusually large variations for a single volcano, but lie within known ranges for Hawaiian basalts. Nd isotope ratios in alkali basalts show the largest relative variation (0.51291–0.51305), and include the nearly constant tholeiite value ( ∼ 0.51297). Pb isotope ratios show similarly large ranges for tholeiites and alkali basalts and continue Tatsumoto's [31] “Loa” trend towards higher 206Pb/204Pb ratios, resulting in a substantial overlap with the “Kea” trend. 206Pb/204Pb ratios for Loihi and other volcanoes along the Loa and Kea trends [31] are observed to correlate with the age of the underlying lithosphere suggesting lithosphere involvement in the formation of Hawaiian tholeiites. Loihi lavas display no correlation of Nd, Sr, or Pb isotope ratios with major element compositions or eruptive age, in contrast with observations of some other Hawaiian volcanoes [38]. Isotope data for Loihi, as well as average values for Hawaiian volcanoes, are not adequately explained by previously proposed two-end-member models; new models for the origin and the development of Hawaiian volcanoes must include mixing of at least three geochemically distinct source regions and allow for the involvement of heterogeneous oceanic lithosphere.