Geochemical evolution processes and water-quality observations based on results of the National Water-Quality Assessment Program in the San Antonio segment of the Edwards aquifer, Texas, 1996-2006
MaryLynn Musgrove, Lynne Fahlquist, Natalie A. Houston, Richard J. Lindgren, Patricia B. Ging
2010, Scientific Investigations Report 2010-5129
As part of the National Water-Quality Assessment Program, the U.S. Geological Survey collected and analyzed groundwater samples during 1996-2006 from the San Antonio segment of the Edwards aquifer of central Texas, a productive karst aquifer developed in Cretaceous-age carbonate rocks. These National Water-Quality Assessment Program studies provide an extensive dataset...
Western Mineral and Environmental Resources Science Center--providing comprehensive earth science for complex societal issues
David G. Frank, Alan R. Wallace, Jill L. Schneider
2010, Circular 1363
Minerals in the environment and products manufactured from mineral materials are all around us and we use and come into contact with them every day. They impact our way of life and the health of all that lives. Minerals are critical to the Nation's economy and knowing where future mineral...
The principal rare earth elements deposits of the United States: A summary of domestic deposits and a global perspective
Keith R. Long, Bradley S. Van Gosen, Nora K. Foley, Daniel Cordier
2010, Scientific Investigations Report 2010-5220
The rare earth elements (REE) are fifteen elements with atomic numbers 57 through 71, from lanthanum to lutetium ('lanthanides'), plus yttrium (39), which is chemically similar to the lanthanide elements and thus typically included with the rare earth elements. Although industrial demand for these elements is relatively small in tonnage...
Potentiometric Surface of the Upper Floridan Aquifer, West-central Florida, May 2010
A.G. Ortiz
2010, Scientific Investigations Map 3139
The Floridan aquifer system consists of the Upper and Lower Floridan aquifers separated by the middle confining unit. The middle confining unit and the Lower Floridan aquifer in west-central Florida generally contain highly mineralized water. The water-bearing units containing fresh water are herein referred to as the Upper Floridan aquifer....
Global mineral resource assessment: porphyry copper assessment of Mexico: Chapter A in Global mineral resource assessment
Jane M. Hammarstrom, Gilpin R. Robinson Jr., Steve Ludington, Floyd Gray, Benjamin J. Drenth, Francisco Cendejas-Cruz, Enrique Espinosa, Efren Perez-Segura, Martin Valencia-Moreno, Jose Luis Rodriguez-Castaneda, Rigobert Vasquez-Mendoza, Lukas Zürcher
2010, Scientific Investigations Report 2010-5090-A
Mineral resource assessments provide a synthesis of available information about distributions of mineral deposits in the Earth’s crust. A probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in Mexico was done as part of a global mineral resource assessment. The purpose of the study was to (1)...
Stratiform chromite deposit model
Ruth F. Schulte, Ryan D. Taylor, Nadine M. Piatak, Robert R. Seal II
2010, Open-File Report 2010-1232
Stratiform chromite deposits are of great economic importance, yet their origin and evolution remain highly debated. Layered igneous intrusions such as the Bushveld, Great Dyke, Kemi, and Stillwater Complexes, provide opportunities for studying magmatic differentiation processes and assimilation within the crust, as well as related ore-deposit formation. Chromite-rich seams within...
Temperature data from wells in Long Valley Caldera, California
Christopher Farrar, Jacob DeAngelo, Colin Williams, Frederick Grubb, Shaul Hurwitz
2010, Data Series 523
The 30-by-20-km Long Valley Caldera (LVC) in eastern California (fig.1) formed at 0.76 Ma in a cataclysmic eruption that resulted in the deposition of 600 km? of Bishop Tuff outside the caldera rim (Bailey, 1989). By approximately 0.6 Ma, uplift of the central part of the caldera floor and eruption...
Hydrogeology and groundwater quality of Highlands County, Florida
Rick M. Spechler
2010, Scientific Investigations Report 2010-5097
Groundwater is the main source of water supply in Highlands County, Florida. As the demand for water in the county increases, additional information about local groundwater resources is needed to manage and develop the water supply effectively. To address the need for additional data, a study was conducted to evaluate...
Estuarine sedimentation, sediment character, and foraminiferal distribution in central San Francisco Bay, California
John L. Chin, Donald L. Woodrow, Mary McGann, Florence L. Wong, Theresa A. Fregoso, Bruce E. Jaffe
2010, Open-File Report 2010-1130
Central San Francisco Bay is the deepest subembayment in the San Francisco Bay estuary and hence has the largest water volume of any of the subembayments. It also has the strongest tidal currents and the coarsest sediment within the estuary. Tidal currents are strongest over the west-central part of central...
Source, Use, and Disposition of Freshwater in Puerto Rico, 2005
Wanda L. Molina-Rivera
2010, Fact Sheet 2009-3080
Water diverted from streams and pumped from wells constitutes the main sources of water for the 78 municipios of the Commonwealth of Puerto Rico. A better understanding is needed about water-use patterns, particularly about the amount of water used, where and how this water is used and disposed, and how...
Geology, geochemistry, and geophysics of the Fry Canyon uranium/copper project site, southeastern Utah: Indications of contaminant migration
James K. Otton, Robert A. Zielinski, Robert Horton
2010, Scientific Investigations Report 2010-5075
The Fry Canyon uranium/copper project site in San Juan County, southeastern Utah, was affected by the historical (1957–68) processing of uranium and copper-uranium ores. Relict uranium tailings and related ponds, and a large copper heap-leach pile at the site represent point sources of uranium and copper to local soils, surface...
Aligning USGS senior leadership structure with the USGS science strategy
Water Resources Division, U.S. Geological Survey
2010, Fact Sheet 2010-3066
The U.S. Geological Survey (USGS) is realigning its management and budget structure to further enhance the work of its science programs and their interdisciplinary focus areas related to the USGS Science Strategy as outlined in 'Facing Tomorrow's Challenges-U.S. Geological Survey Science in the Decade 2007-2017' (U.S. Geological Survey, 2007). In...
A geologic and anthropogenic journey from the Precambrian to the new energy economy through the San Juan volcanic field
Douglas B. Yager, Alison Burchell Alison, Raymond H. Johnson
2010, Book chapter, Through the generations: Geologic and anthropogenic field excursions in the Rocky Mountains from modern to ancient
The San Juan volcanic field comprises 25,000 km2 of intermediate composition mid-Tertiary volcanic rocks and dacitic to rhyolitic calderas including the San Juan–Uncompahgre and La Garita caldera-forming super-volcanoes. The region is famous for the geological, ecological, hydrological, archeological, and climatological diversity. These characteristics supported ancestral Puebloan populations....
Delineation and Prediction Uncertainty of Areas Contributing Recharge to Selected Well Fields in Wetland and Coastal Settings, Southern Rhode Island
Paul J. Friesz
2010, Scientific Investigations Report 2010-5060
Areas contributing recharge to four well fields in two study sites in southern Rhode Island were delineated on the basis of steady-state groundwater-flow models representing average hydrologic conditions. The wells are screened in sand and gravel deposits in wetland and coastal settings. The groundwater-flow models were calibrated by inverse modeling...
Spatial Databases of Geological, Geophysical, and Mineral Resource Data Relevant to Sandstone-Hosted Copper Deposits in Central Kazakhstan
Boris Syusyura, Stephen E. Box, John C. Wallis
2010, Open-File Report 2010-1124
Central Kazakhstan is host to one of the world's giant sandstone-hosted copper deposits, the Dzhezkazgan deposit, and several similar, smaller deposits. The United Stated Geological Survey (USGS) is assessing the potential for other, undiscovered deposits of this type in the surrounding region of central Kazakhstan. As part of this effort,...
Rock Geochemistry and Mineralogy from Fault Zones and Polymetallic Fault Veins of the Central Front Range, Colorado
Jonathan S. Caine, Dana J. Bove
2010, Data Series 492
During the 2004 to 2008 field seasons, approximately 200 hand samples of fault and polymetallic vein-related rocks were collected for geochemical and mineralogical analyses. The samples were collected by the U.S. Geological Survey as part of the Evolution of Brittle Structures Task under the Central Colorado Assessment Project (CCAP) of...
Reconnaissance geologic map of the Hyampom 15' quadrangle, Trinity County, California
William P. Irwin
2010, Scientific Investigations Map 3129
The Hyampom 15' quadrangle lies west of the Hayfork 15' quadrangle in the southern part of the Klamath Mountains geologic province of northern California. It spans parts of four generally northwest-trending tectono- stratigraphic terranes of the Klamath Mountains, the Eastern Hayfork, Western Hayfork, Rattlesnake Creek, and Western Jurassic terranes, as...
Visible and near-infrared multispectral analysis of geochemically measured rock fragments at the Opportunity landing site in Meridiani Planum
Catherine M. Weitz, William H. Farrand, Jeffrey R. Johnson, Iris Fleischer, Christian Schroder, Aileen Yingst, Bradley L. Jolliff, Ralf Gellert, Jim Bell, Kenneth E. Herkenhoff, G. Klingelhoefer, Barbara Cohen, Wendy M. Calvin, Malcolm Rutherford, James W. Ashley
2010, Journal of Geophysical Research E: Planets (115)
We have used visible and near‐infrared Panoramic Camera (Pancam) spectral data acquired by the Opportunity rover to analyze 15 rock fragments at the Meridiani Planum landing site. These spectral results were then compared to geochemistry measurements made by the in situ instruments Mössbauer (MB) and Alpha Particle X‐ray Spectrometer (APXS)...
Microbial carbon cycling in oligotrophic regional aquifers near the Tono Uranium Mine, Japan as inferred from δ13C and Δ14C values of in situ phospholipid fatty acids and carbon sources
Christopher T. Mills, Yuki Amano, Gregory F. Slater, Robert F. Dias, Teruki Iwatsuki, Kevin W. Mandernack
2010, Geochimica et Cosmochimica Acta (74) 3785-3805
Microorganisms are ubiquitous in deep subsurface environments, but their role in the global carbon cycle is not well-understood. The natural abundance δ13C and Δ14C values of microbial membrane phospholipid fatty acids (PLFAs) were measured and used to assess the carbon sources of bacteria in sedimentary and granitic groundwaters sampled from...
Sources of aerosol nitrate to the Gulf of Aqaba: Evidence from δ15N and δ18O of nitrate and trace metal chemistry
Scott D. Wankel, Ying Chen, Carol Kendall, A.F. Post, Adina Paytan
2010, Marine Chemistry (120) 90-99
The nitrogen (N) and oxygen (O) isotopic composition (δ15N and δ18O) of water soluble aerosol nitrate was measured in aerosol samples collected in Eilat, Israel, from August 2003 to November 2004. During this period δ15N values ranged from − 6.9‰ to + 1.9‰ and δ18O from + 65.1‰ to + 84.9‰ and exhibited strong...
PHAST version 2-A program for simulating groundwater flow, solute transport, and multicomponent geochemical reactions
David L. Parkhurst, Kenneth L. Kipp, Scott R. Charlton
2010, Techniques and Methods 6-A35
The computer program PHAST (PHREEQC And HST3D) simulates multicomponent, reactive solute transport in three-dimensional saturated groundwater flow systems. PHAST is a versatile groundwater flow and solute-transport simulator with capabilities to model a wide range of equilibrium and kinetic geochemical reactions. The flow and transport calculations are based on a modified...
Mineralogy and stratigraphy of phyllosilicate-bearing and dark mantling units in the greater Mawrth Vallis/west Arabia Terra area: Constraints on geological origin
E.Z. Noe Dobrea, J.L. Bishop, N.K. McKeown, R. Fu, C.M. Rossi, J.R. Michalski, C. Heinlein, V. Hanus, F. Poulet, R.J.F. Mustard, S. Murchie, A. S. McEwen, G. Swayze, J.-P. Bibring, E. Malaret, C. Hash
2010, Journal of Geophysical Research (115)
Analyses of MRO/CRISM images of the greater Mawrth Vallis region of Mars affirm the presence of two primary phyllosilicate assemblages throughout a region ∼1000 × 1000 km. These two units consist of an Fe/Mg-phyllosilicate assemblage overlain by an Al-phyllosilicate and hydrated silica assemblage. The lower unit contains Fe/Mg-smectites, sometimes combined...
Gas, oil, and water production from Grand Valley, Parachute, Rulison, and Mamm Creek fields in the Piceance Basin, Colorado
Philip H. Nelson, Stephen L. Santus
2010, Open-File Report 2010-1110
Gas, oil, and water production data for tight gas reservoirs were compiled from selected wells in western Colorado. These reservoir rocks—the relatively shallow Paleogene Wasatch G sandstone interval in the Parachute and Rulison fields and fluvial sandstones in the deeper Upper Cretaceous Mesaverde Group in the Grand Valley, Parachute, Rulison,...
Ecosystem health in mineralized terrane — Data from podiform chromite (Chinese Camp mining district, California), quartz alunite (Castle Peak and Masonic mining districts, Nevada/California), and Mo/Cu porphyry (Battle Mountain mining district, Nevada) deposits
Steve W. Blecker, Lisa L. Stillings, Michael C. Amacher, James A. Ippolito, Nicole M. DeCrappeo
2010, Open-File Report 2010-1040
The myriad definitions of soil/ecosystem quality or health are often driven by ecosystem and management concerns, and they typically focus on the ability of the soil to provide functions relating to biological productivity and/or environmental quality. A variety of attempts have been made to create indices that quantify the complexities...
Temporal chemical data for sediment, water, and biological samples from the Lava Cap Mine Superfund site, Nevada County, California— 2006–2008
Andrea L. Foster, Georges Ona-Nguema, Kate Tufano, Richard III White
2010, Open-File Report 2009-1268
The Lava Cap Mine is located about 6 km east of the city of Grass Valley, Nevada County, California, at an elevation of about 900 m. Gold was hosted in quartz-carbonate veins typical of the Sierran Gold Belt, but the gold grain size was smaller and the abundance of sulfide...
