Paragenetic and minor- and trace-element studies of Mississippi Valley-type ore deposits of the Silesian-Cracow district, Poland
J.G. Viets, D. L. Leach, F.E. Lichte, R.T. Hopkins, C. A. Gent, J. W. Powell
1996, Prace - Panstwowego Instytutu Geologicznego (154) 36-71
Paragenetic and minor- and trace-element studies were conducted on samples of epigenetic ore and gangue minerals collected from mines and drill core in the Silesian-Cracow (S-C) district of southern Poland. Four discrete mineral suites representing four mineralizing stages can be identified throughout the district. The earliest epigenetic minerals deposited during...
Reactive transport modeling of acidic metal-contaminated ground water at a site with sparse spatial information
P. Glynn, J. Brown
1996, Reviews in Mineralogy (34) 377-438
No abstract available....
Herbicide metabolites in surface water and groundwater: Introduction and overview
E.M. Thurman, M. T. Meyer
1996, ACS Symposium Series (630)
Several future research topics for herbicide metabolites in surface and ground water are outlined in this chapter. They are herbicide usage, chemical analysis of metabolites, and fate and transport of metabolites in surface and ground water. These three ideas follow the themes in this book, which are the summary of...
Wide angle X-ray scattering (WAXS) study of "two-line" ferrihydrite structure: Effect of arsenate sorption and counterion variation and comparison with EXAFS results
G.A. Waychunas, C. C. Fuller, B.A. Rea, J.A. Davis
1996, Geochimica et Cosmochimica Acta (60) 1765-1781
Wide angle X-ray scattering (WAXS) measurements have been made on a suite of “two-line” ferrihydrite (FHY2) samples containing varying amounts of coprecipitated arsenate. Samples prepared at pH 8 with counter ions chloride, nitrate, and a mixture of both also were examined. The raw WAXS scattering functions show that “two-line” ferrihydrite...
Experimental investigation and modeling of uranium (VI) transport under variable chemical conditions
M. Kohler, G.P. Curtis, D.B. Kent, J.A. Davis
1996, Water Resources Research (32) 3539-3551
The transport of adsorbing and complexing metal ions in porous media was investigated with a series of batch and column experiments and with reactive solute transport modeling. Pulses of solutions containing U(VI) were pumped through columns filled with quartz grains, and the breakthrough of U(VI) was studied as a function...
Kinetic and mineralogic controls on the evolution of groundwater chemistry and 87Sr/86Sr in a sandy silicate aquifer, northern Wisconsin, USA
T.D. Bullen, D. P. Krabbenhoft, C. Kendall
1996, Geochimica et Cosmochimica Acta (60) 1807-1821
Substantial flowpath-related variability of 87Sr/86Sr is observed in groundwaters collected from the Trout Lake watershed of northern Wisconsin. In the extensive shallow aquifer composed of sandy glacial outwash, groundwater is recharged either by seepage from lakes or by precipitation that infiltrates the inter-lake uplands. 87Sr/86Sr of groundwater derived mainly as...
The long-term salinity field in San Francisco Bay
R.J. Uncles, D. H. Peterson
1996, Continental Shelf Research (16) 2005-2039
Data are presented on long-term salinity behaviour in San Francisco Bay, California. A two-level, width averaged model of the tidally averaged salinity and circulation has been written in order to interpret the long-term (days to decades) salinity variability. The model has been used to simulate daily averaged salinity in the...
Use of 13C NMR and ftir for elucidation of degradation pathways during natural litter decomposition and composting I. early stage leaf degradation
R.L. Wershaw, J.A. Leenheer, K. R. Kennedy, T.I. Noyes
1996, Soil Science (161) 667-679
Oxidative degradation of plant tissue leads to the formation of natural dissolved organic carbon (DOC) and humus. Infrared (IR) and 13C nuclear magnetic resonance (NMR) spectrometry have been used to elucidate the chemical reactions of the early stages of degradation that give rise to DOC derived from litter and compost....
Shallow subsurface geology of part of the Savannah River alluvial valley in the upper Coastal Plain of Georgia and South Carolina
D.C. Leeth, D.D. Nagle
1996, Southeastern Geology (36) 1-14
The depth to which Coastal Plain rivers incise underlying formations is an important control on local and regional hydrologic flow systems. In order to clarify these stream/aquifer relations, a better understanding of the shallow subsurface geology of the Savannah River was necessary. To accomplish this, three drillhole transects were completed...
Mapping playa evaporite minerals and associated sediments in Death Valley, California, with multispectral thermal infrared images
J.K. Crowley, S.J. Hook
1996, Journal of Geophysical Research B: Solid Earth (101) 643-660
Efflorescent salt crusts and associated sediments in Death Valley, California, were studied with remote-sensing data acquired by the NASA thermal infrared multispectral scanner (TIMS). Nine spectral classes that represent a variety of surface materials were distinguished, including several classes that reflect important aspects of the playa groundwater chemistry and hydrology....
Cadmium in the California Current system: Tracer of past and present upwelling
A. VanGeen, D.M. Husby
1996, Journal of Geophysical Research C: Oceans (101) 3489-3507
Over 100 samples were collected off the west coast of North America during 1991–1993 to determine the relation between wind‐driven upwelling and nearshore concentrations of dissolved silicate (Si), phosphate (P), and cadmium (Cd). Highly enriched in deep water offshore, these constituents are sensitive indicators of upwelling. Coastal...
Hydrogeologic controls on the groundwater interactions with an acidic lake in karst terrain, Lake Barco, Florida
T. M. Lee
1996, Water Resources Research (32) 831-844
Transient groundwater interactions and lake stage were simulated for Lake Barco, an acidic seepage lake in the mantled karst of north central Florida. Karst subsidence features affected groundwater flow patterns in the basin and groundwater fluxes to and from the lake. Subsidence features peripheral to the lake intercepted potential groundwater...
Using remote sensing and GIS techniques to estimate discharge and recharge. fluxes for the Death Valley regional groundwater flow system, USA
F. A. D’Agnese, C.C. Faunt, Turner A. Keith
1996, IAHS-AISH Publication 503-511
The recharge and discharge components of the Death Valley regional groundwater flow system were defined by remote sensing and GIS techniques that integrated disparate data types to develop a spatially complex representation of near-surface hydrological processes. Image classification methods were applied to multispectral satellite data to produce a vegetation map....
The composition of fluid inclusions in ore and gangue minerals from the Silesian-Cracow Mississippi Valley-type Zn-Pb deposits Poland: Genetic and environmental implications
J.G. Viets, A. H. Hofstra, P. Emsbo, A. Kozlowski
1996, Prace - Panstwowego Instytutu Geologicznego (154) 85-103
The composition of fluids extracted from ore and gangue sulfide minerals that span most of the paragenesis of the Silesian-Cracow district was determined using a newly developed ion chromatographic (IC) technique. Ionic species determined were Na+, NH+4, Ca2+, Mg2+, K+, Rb+, Sr2+, Ba2+, Cl-, Br-, F-, I-, PO3-4, CO2-3, HS-,...
Variability in surface energy flux partitioning during Washita '92: Resulting effects on Penman-Monteith and Priestley-Taylor parameters
William P. Kustas, D.I. Stannard, K.J. Allwine
1996, Agricultural and Forest Meteorology (82) 171-193
During the Washita '92 field experiment, the local surface energy balance was evaluated at four locations in the USDA-ARS Little Washita River Watershed near Chickasha, OK, using the Bowen ratio-energy balance (BREB) approach. For any given day, differences in the partitioning of the...
Age dating of shallow groundwater with chlorofluorocarbons, tritium/helium: 3, and flow path analysis, southern New Jersey coastal plain
Zoltan Szabo, D.E. Rice, Niel Plummer, E. Busenberg, S. Drenkard, P. Schlosser
1996, Water Resources Research (32) 1023-1038
Groundwater age dating through the combination of transient tracer methods (chlorofluorocarbons (CFCs) and tritium/helium 3 (3H/3He)) and groundwater flow path analysis is useful for investigating groundwater travel times, flow patterns, and recharge rates, as demonstrated by this study of the homogeneous shallow, unconfined Kirkwood-Cohansey aquifer system in the southern New...
Integrating a geographic information system, a scientific visualization system, and a precipitation model
L.E. Hay, L.K. Knapp
1996, Water Resources Bulletin (32) 357-369
Investigating natural, potential, and human-induced impacts on hydrologic systems commonly requires complex modeling with overlapping data requirements, plus massive amounts of one- to four-dimensional data at multiple scales and formats. Given the complexity of most hydrologic studies, the requisite software infrastructure must incorporate many components including simulation modeling and spatial...
Sulfur isotope geochemistry of ore and gangue minerals from the Silesian-Cracow Mississippi Valley-type ore district, Poland
D. L. Leach, J.G. Vets, C. A. Gent
1996, Prace - Panstwowego Instytutu Geologicznego (154) 121-137
Studies of the sulfur isotopic composition of ore and gangue minerals from the Silesian-Cracow Zn-Pb district were conducted to gain insights into processes that controlled the location and distribution of the ore deposits. Results of this study show that minerals from the Silesian-Cracow ore district have the largest range of...
Mechanism of formation of humus coatings on mineral surfaces 2. Attenuated total reflectance spectra of hydrophobic and hydrophilic fractions of organic acids from compost leachate on alumina
R.L. Wershaw, E.C. Llaguno, J.A. Leenheer, R.P. Sperline, Y. Song
1996, Colloids and Surfaces A: Physicochemical and Engineering Aspects (108) 199-211
Hydrophobic and hydrophilic fractions were isolated from a compost leachate. The adsorption isotherms of both fractions on alumina were measured by attenuated total reflectance infrared spectroscopy. The shapes of the adsorption isotherms of the two fractions were different. The isotherms for the hydrophilic fraction showed little change in surface excess...
Hydrologic landscapes on the Delmarva Peninsula - Part 2: Estimates of base-flow nitrogen load to Chesapeake Bay
Bachman L. Joseph, P. J. Phillips
1996, Journal of the American Water Resources Association (32) 779-791
ABSTRACT: The relation between landscape characteristics and water chemistry on the Delmarva Peninsula can be determined through a principal-component analysis of basin characteristics. Two basin types were defined by factor scores: (1) well-drained basins, characterized by combinations of a low percentage of forest cover, a low...
Mechanism of formation of humus coatings on mineral surfaces 3. Composition of adsorbed organic acids from compost leachate on alumina by solid-state 13C NMR
R.L. Wershaw, E.C. Llaguno, J.A. Leenheer
1996, Colloids and Surfaces A: Physicochemical and Engineering Aspects (108) 213-223
The adsorption of compost leachate DOC on alumina is used as a model for elucidation of the mechanism of formation of natural organic coatings on hydrous metal oxide surfaces in soils and sediments. Compost leachate DOC is composed mainly of organic acid molecules. The solid-state 13C NMR spectra of these...
Satellite imagery of the onset of streaming flow of ice streams C and D, West Antarctica
S. M. Hodge, S.K. Doppelhammer
1996, Journal of Geophysical Research C: Oceans (101) 6669-6677
Five overlapping Landsat multispectral scanner satellite images of the interior of the West Antarctic ice sheet were enhanced with principal component analysis, high-pass filtering, and linear contrast stretching and merged into a mosaic by aligning surface features in the overlap areas. The mosaic was registered to geodetic coordinates, to an...
Transverse dispersion of contaminants in fractured permeable formations
H. Rubin, R. W. Buddemeier
1996, Journal of Hydrology (176) 133-151
Our interest in understanding some of the mechanisms involved in the mineralization of the Great Bend Prairie aquifer of Kansas by salt water originating from Permian bedrock formations, which are fractured sandstones, has prompted this basic study. The fractured permeable formatiodis...
Use of precipitation and groundwater isotopes to interpret regional hydrology on a tropical volcanic island: Kilauea volcano area, Hawaii
M. A. Scholl, S. E. Ingebritsen, C. J. Janik, J. P. Kauahikaua
1996, Water Resources Research (32) 3525-3537
Isotope tracer methods were used to determine flow paths, recharge areas, and relative age for groundwater in the Kilauea volcano area of the Island of Hawaii. A network of up to 66 precipitation collectors was emplaced in the study area and sampled twice yearly for a 3-year period. Stable isotopes...
Solution of the advection-dispersion equation: Continuous load of finite duration
R.L. Runkel
1996, Journal of Environmental Engineering (122) 830-832
Field studies of solute fate and transport in streams and rivers often involve an. experimental release of solutes at an upstream boundary for a finite period of time. A review of several standard references on surface-water-quality modeling indicates that the analytical solution to the constant-parameter advection-dispersion equation for this type...
