Sediment-hosted lead-zinc deposits in Earth history
David L Leach, Dwight Bradley, David Huston, Sergei A. Pisarevsky, Ryan D. Taylor, S. Gardoll
2010, Economic Geology (105) 593-625
Sediment-hosted Pb-Zn deposits can be divided into two major subtypes. The first subtype is clastic-dominated lead-zinc (CD Pb-Zn) ores, which are hosted in shale, sandstone, siltstone, or mixed clastic rocks, or occur as carbonate replacement, within a CD sedimentary rock sequence. This subtype includes deposits that have been traditionally referred...
Secular variation in economic geology
Richard J. Goldfarb, Dwight Bradley, David L Leach
2010, Economic Geology (105) 459-465
The temporal pattern of ore deposits on a constantly evolving Earth reflects the complex interplay between the evolving global tectonic regime, episodic mantle plume events, overall changes in global heat flow, atmospheric and oceanic redox states, and even singular impact and glaciation events. Within...
Modeling the production, decomposition, and transport of dissolved organic carbon in boreal soils
Zhaosheng Fan, Jason C. Neff, Kimberly P. Wickland
2010, Soil Science (175) 223-232
The movement of dissolved organic carbon (DOC) through boreal ecosystems has drawn increased attention because of its potential impact on the feedback of OC stocks to global environmental change in this region. Few models of boreal DOC exist. Here we present a one-dimensional model with simultaneous production, decomposition, sorption/desorption, and...
Digital tabulation of geologic and hydrologic data from wells in the northern San Francisco Bay region, northern California
D. S. Sweetkind, E. M. Taylor
2010, Open-File Report 2010-1063
Downhole lithologic information and aquifer pumping test data are reported from 464 wells from a broad area of the northern part of the Coast Ranges in California. These data were originally published in paper form as numerous tables within three USGS Water-Supply Papers describing geology and groundwater conditions in Napa...
Mercury assessment and monitoring protocol for the Bear Creek Watershed, Colusa County, California
Thomas H. Suchanek, Roger L. Hothem, James J. Rytuba, Julie L. Yee
2010, Scientific Investigations Report 2010-5018
This report summarizes the known information on the occurrence and distribution of mercury (Hg) in physical/chemical and biological matrices within the Bear Creek watershed. Based on these data, a matrix-specific monitoring protocol for the evaluation of the effectiveness of activities designed to remediate Hg contamination in the Bear Creek watershed...
Estimated Withdrawals and Use of Water in Colorado, 2005
Tamara Ivahnenko, Jennifer L. Flynn
2010, Scientific Investigations Report 2010-5002
The future health and economic welfare of the people and environment of Colorado depend on a continuous supply of fresh water. Detailed, comprehensive information on the use of water from Colorado's diverse surface-water and groundwater resources is important to water managers and planners by providing information they need to quantify...
Reconnaissance geochronology of tuffs in the Miocene Barstow Formation: implications for basin evolution and tectonics in the central Mojave Desert
D. M. Miller, S.R. Leslie, John W. Hillhouse, J. L. Wooden, J.A. Vazquez, R. E. Reynolds
2010, Book, Overboard in the Mojave: 20 million years of lakes and wetlands
Early to middle Miocene lacustrine strata of the Barstow Formation are well dated in just a few places, limiting our ability to infer basin evolution and regional tectonics. At the type section in the Mud Hills, previous studies have shown that the lacustrine interval of the Barstow Formation is...
Stratigraphy, age, and depositional setting of the Miocene Barstow Formation at Harvard Hill, central Mojave Desert, California
Shannon R. Leslie, David M. Miller, Joseph L. Wooden, Jorge A. Vazquez
2010, Conference Paper, Overboard in the Mojave: 20 million years of lakes and wetlands
New detailed geologic mapping and geochronology of the Barstow Formation at Harvard Hill, 30 km east of Barstow, CA, help to constrain Miocene paleogeography and tectonics of the central Mojave Desert. A northern strand of the Quaternary ENE-striking, sinistral Manix fault divides the Barstow Formation at Harvard Hill into two...
Abandoned mine drainage in the Swatara Creek Basin, southern anthracite coalfield, Pennsylvania, USA: 1. stream quality trends coinciding with the return of fish
Charles A. Cravotta III, Robin A. Brightbill, Michael J. Langland
2010, Mine Water and the Environment (29) 176-199
Acidic mine drainage (AMD) from legacy anthracite mines has contaminated Swatara Creek in eastern Pennsylvania. Intermittently collected base-flow data for 1959–1986 indicate that fish were absent immediately downstream from the mined area where pH ranged from 3.5 to 7.2 and concentrations of sulfate, dissolved iron, and dissolved aluminum were as...
Abandoned mine drainage in the Swatara Creek Basin, southern anthracite coalfield, Pennsylvania, USA: 2. performance of treatment systems
Charles A. Cravotta III
2010, Mine Water and the Environment (29) 200-216
A variety of passive and semi-passive treatment systems were constructed by state and local agencies to neutralize acidic mine drainage (AMD) and reduce the transport of dissolved metals in the upper Swatara Creek Basin in the Southern Anthracite Coalfield in eastern Pennsylvania. To evaluate the effectiveness of selected treatment systems...
Reconnaissance geochronology of tuffs in the Miocene Barstow Formation: Implications for basin evolution and tectonics in the central Mojave Desert
David M. Miller, Shannon R. Leslie, John W. Hillhouse, Joseph L. Wooden, Jorge A. Vazquez, R. E. Reynolds
2010, Conference Paper, Overboard in the Mojave: 20 million years of lakes and wetlands
Early to middle Miocene lacustrine strata of the Barstow Formation are well dated in just a few places, limiting our ability to infer basin evolution and regional tectonics. At the type section in the Mud Hills, previous studies have shown that the lacustrine interval of the Barstow Formation is between...
Geologic Map of MTM -40277, -45277, -40272, and -45272 Quadrangles, Eastern Hellas Planitia Region of Mars
Leslie F. Bleamaster III, David A. Crown
2010, Scientific Investigations Map 3096
Hellas Planitia comprises the floor deposits of the Hellas basin, more than 2,000 km across and 8 km deep, which is located in the southern hemisphere's cratered highlands and is the largest well-preserved impact structure on the Martian surface. The circum-Hellas highlands represent a significant percentage of the southern hemisphere...
Evaluation of Methods for Delineating Zones of Transport for Production Wells in Karst and Fractured-Rock Aquifers of Minnesota
Perry M. Jones
2010, Scientific Investigations Report 2010-5005
Assessment of groundwater-flow conditions in the vicinity of production wells in karst and fractured-rock settings commonly is difficult due in part to the lack of detailed hydrogeologic information and the resources needed to collect it. To address this concern and to better understand the hydrogeology and aquifer properties of karst...
Geophysical characterization of subsurface properties relevant to the hydrology of the Standard Mine in Elk Basin, Colorado
Burke J. Minsley, Lyndsay B. Ball, Bethany L. Burton, Jonathan S. Caine, Erika Curry-Elrod, Andrew H. Manning
2010, Open-File Report 2009-1284
Geophysical data were collected at the Standard Mine in Elk Basin near Crested Butte, Colorado, to help improve the U.S. Environmental Protection Agency's understanding of the hydrogeologic controls in the basin and how they affect surface and groundwater interactions with nearby mine workings. These data are discussed in the context...
Changes in the chemistry of shallow groundwater related to the 2008 injection of CO2 at the ZERT field site, Bozeman, Montana
Yousif K. Kharaka, James J. Thordsen, Evangelos Kakouros, Gil Ambats, William N. Herkelrath, Sarah R. Beers, J.T. Birkholzer, J. A. Apps, Nicholas F. Spycher, Liange Zheng, Robert C. Trautz, Henry W. Rauch, K.S. Gullickson
2010, Environmental Earth Sciences (60) 273-284
Approximately 300 kg/day of food-grade CO2 was injected through a perforated pipe placed horizontally 2–2.3 m deep during July 9–August 7, 2008 at the MSU-ZERT field test to evaluate atmospheric and near-surface monitoring and detection techniques applicable to the subsurface storage and potential leakage of CO2. As part of this multidisciplinary research project,...
The Quaternary Silver Creek Fault Beneath the Santa Clara Valley, California
Carl M. Wentworth, Robert A. Williams, Robert C. Jachens, Russell W. Graymer, William J. Stephenson
2010, Open-File Report 2010-1010
The northwest-trending Silver Creek Fault is a 40-km-long strike-slip fault in the eastern Santa Clara Valley, California, that has exhibited different behaviors within a changing San Andreas Fault system over the past 10-15 Ma. Quaternary alluvium several hundred meters thick that buries the northern half of the Silver Creek Fault,...
Gas, oil, and water production from Jonah, Pinedale, Greater Wamsutter, and Stagecoach Draw fields in the Greater Green River Basin, Wyoming
Philip H. Nelson, Shauna M. Ewald, Stephen L. Santus, Patrick K. Trainor
2010, Open-File Report 2009-1290
Gas, oil, and water production data were compiled from selected wells in four gas fields in rocks of Late Cretaceous age in southwestern Wyoming. This study is one of a series of reports examining fluid production from tight-gas reservoirs, which are characterized by low permeability, low porosity, and the presence...
To reactivate or not to reactivate: nature and varied behavior of structural inheritance in the Proterozoic basement of the Eastern Colorado mineral belt over 1.7 billion years of earth history
Jonathan S. Caine, John Ridley, Zachary R. Wessel
2010, GSA Field Guides (18) 119-140
The eastern central Front Range of the Rocky Mountains in Colorado has long been a region of geologic interest because of Laramide-age hydrothermal polymetallic vein-related ores. The region is characterized by a well-exposed array of geologic structures associated with ductile and brittle deformation, which record crustal strain over 1.7 billion...
Stress, fracture, and fluid-flow analysis using acoustic and electrical image logs in hot fractured granites of the Coso geothermal field, California, U.S.A.
Nicholas C. Davatzes, Stephen H. Hickman
M. Poppelreiter, C. Garcia-Carballido, M. Kraaijveld, editor(s)
2010, Book chapter, Dipmeter and borehole image log technology
Acoustic and electrical image logs in fractured granitic rocks penetrated by U.S. Navy well 58A-10, Coso Wash, in the eastern margin of the Coso geothermal field, California, were compared to evaluate their relative ability to characterize fractures and fault rock textures and to measure stress orientations from borehole failure. Electrical...
In situ sulfur isotope analysis of sulfide minerals by SIMS: Precision and accuracy, with application to thermometry of ~3.5Ga Pilbara cherts
R. Kozdon, N.T. Kita, J.M. Huberty, J.H. Fournelle, C. A. Johnson, J.W. Valley
2010, Chemical Geology (275) 243-253
Secondary ion mass spectrometry (SIMS) measurement of sulfur isotope ratios is a potentially powerful technique for in situ studies in many areas of Earth and planetary science. Tests were performed to evaluate the accuracy and precision of sulfur isotope analysis by SIMS in a set of seven well-characterized, isotopically homogeneous...
A review of silver-rich mineral deposits and their metallogeny
Frederick Graybeal, Peter G. Vikre
2010, Book chapter, The challenge of finding new mineral resources: Global metallogeny, innovative exploration, and new discoveries; SEG Special Publication 15 Vol. 1
Mineral deposits with large inventories or high grades of silver are found in four genetic groups: (1) volcanogenic massive sulfide (VMS), (2) sedimentary exhalative (SEDEX), (3) lithogene, and, (4) magmatichydrothermal. Principal differences between the four groups relate to source rocks and regions, metal associations, process and timing of mineralization, and...
Laboratory-based maximum slip rates in earthquake rupture zones and radiated energy
Art McGarr, Joe B. Fletcher, M. Boettcher, N. Beeler, J. Boatwright
2010, Bulletin of the Seismological Society of America (100) 3250-3260
Laboratory stick-slip friction experiments indicate that peak slip rates increase with the stresses loading the fault to cause rupture. If this applies also to earthquake fault zones, then the analysis of rupture processes is simplified inasmuch as the slip rates depend only on the local yield stress and are independent...
11-Deoxycortisol is a corticosteroid hormone in the lamprey
D.A. Close, S.-S. Yun, S. D. McCormick, A.J. Wildbill, W. Li
2010, Proceedings of the National Academy of Sciences of the United States of America (107) 13942-13947
Corticosteroid hormones are critical for controlling metabolism, hydromineral balance, and the stress response in vertebrates. Although corticosteroid hormones have been well characterized in most vertebrate groups, the identity of the earliest vertebrate corticosteroid hormone has remained elusive. Here we provide evidence that 11-deoxycortisol is the corticosteroid hormone in the lamprey,...
Reactive transport modeling to study changes in water chemistry induced by CO2 injection at the Frio-I Brine Pilot
T. Xu, Y.K. Kharaka, C. Doughty, B.M. Freifeld, T.M. Daley
2010, Chemical Geology (271) 153-164
To demonstrate the potential for geologic storage of CO2 in saline aquifers, the Frio-I Brine Pilot was conducted, during which 1600 tons of CO2 were injected into a high-permeability sandstone and the resulting subsurface plume of CO2 was monitored using a variety of hydrogeological, geophysical, and geochemical techniques. Fluid samples...
The Sudbury impact layer in the paleoproterozoiciron ranges of northern Michigan, USA
W.F. Cannon, K. J. Schulz, J. Wright Horton Jr., David A. King
2010, Geological Society of America Bulletin (122) 50-75
A layer of breccia that contains fragments of impact ejecta has been found at 10 sites in the Paleoproterozoic iron ranges of northern Michigan, in the Lake Superior region of the United States. Radiometric age constraints from events predating and postdating deposition of the breccia are ca. 1875 Ma and...
