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Year Published: 2015

Physical subdivision and description of the water-bearing sediments of the Santa Clara Valley, California

A thick Quaternary alluvial section fills a sedimentary basin beneath the Santa Clara Valley, California, located within the San Andreas Fault system at the south end of San Francisco Bay. This section consists of an upper sequence about 1,000 feet thick containing eight sedimentary cycles and a lower fine-grained unit as thick as several hundred...

Wentworth, Carl M.; Jachens, Robert C.; Williams, Robert A.; Tinsley, John C.; Hanson, Randall T.
Wentworth, C.M., Jachens, R.C., Williams, R.A., Tinsley, J.C., and Hanson, R.T., 2015, Physical subdivision and description of the water-bearing sediments of the Santa Clara Valley, California: U.S. Geological Survey Scientific Investigations Report 2015–5017, 73 p., 2 plates, http://dx.doi.org/10.3133/sir20155017.

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Year Published: 2015

Expanding metal mixture toxicity models to natural stream and lake invertebrate communities

A modeling approach that was used to predict the toxicity of dissolved single and multiple metals to trout is extended to stream benthic macroinvertebrates, freshwater zooplankton, and Daphnia magna. The approach predicts the accumulation of toxicants (H, Al, Cd, Cu, Ni, Pb, and Zn) in organisms using 3 equilibrium accumulation models that define...

Balistrieri, Laurie S.; Mebane, Christopher A.; Schmidt, Travis S.; Keller, William (Bill)
Balistrieri, L.S., Mebane, C.A., Schmidt, T.S., and Kellerk, W. 2015, Expanding metal mixture toxicity models to natural stream and lake invertebrate communities: Environmental Toxicology and Chemistry, v. 34, n. 4, p. 761-776, doi:10.1002/etc.2824

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Year Published: 2015

Porphyry copper assessment of the Central Asian Orogenic Belt and eastern Tethysides: China, Mongolia, Russia, Pakistan, Kazakhstan, Tajikistan, and India: Chapter X in Global mineral resource assessment

The U.S. Geological Survey collaborated with international colleagues to assess undiscovered resources in porphyry copper deposits in the Central Asian Orogenic Belt and eastern Tethysides. These areas host 20 known porphyry copper deposits, including the world class Oyu Tolgoi deposit in Mongolia that was discovered in the late 1990s. The study...

Mihalasky, Mark J.; Ludington, Stephen; Hammarstrom, Jane M.; Alexeiev, Dmitriy V.; Frost, Thomas P.; Light, Thomas D.; Robinson, Gilpin R.; Briggs, Deborah A.; Wallis, John C.; Miller, Robert J.; Bookstrom, Arthur A.; Panteleyev, Andre; Chitalin, Andre; Seltmann, Reimar; Guangsheng, Yan; Changyun, Lian; Jingwen, Mao; Jinyi, Li; Keyan, Xiao; Ruizhao, Qiu; Jianbao, Shao; Gangyi, Shai; Yuliang, Du
Mihalasky, M.J., Ludington, Steve, Hammarstrom, J.M., Alexeiev, D.V., Frost, T.P., Light, T.D., Robinson, G.R., Jr., Briggs, D.A., Wallis, J.C., and Miller, R.J., with contributions from Bookstrom, A.A., Panteleyev, Andre, Chitalin, Andre, Seltmann, Reimar, Guangsheng, Y., Changyun, L., Jingwen, M., Jinyi, L., Keyan, X., Ruizhao, Q., Jianbao, S., Gangyi, S., and Yuliang, D., 2015, Porphyry Copper Assessment of the Central Asian Orogenic Belt and eastern Tethysides—China, Mongolia, Russia, Pakistan, Kazakhstan, Tajikistan, and India: U.S. Geological Survey Scientific Investigations Report 2010–5090–X, 106 p. and spatial data, http://dx.doi.org/10.3133/sir20105090X.

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Year Published: 2015

Detailed interpretation of aeromagnetic data from the Patagonia Mountains area, southeastern Arizona

The induced magnetic field and the remanent magnetic field of rock masses are important to geologic modeling based on Earth’s magnetic field data. The orientation of the induced magnetic field is approximately parallel to the orientation of Earth’s geomagnetic field and its intensity can be derived from measured magnetic...

Bultman, Mark W.
Bultman, M.W., 2015, Detailed interpretation of aeromagnetic data from the Patagonia Mountains area, southeastern Arizona: U.S. Geological Survey Scientific Investigations Report 2015-5029, 25 p., http://dx.doi.org/10.3133/sir20155029.

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Year Published: 2015

Laboratory electrical resistivity analysis of geologic samples from Fort Irwin, California

Correlating laboratory resistivity measurements with geophysical resistivity models helps constrain these models to the geology and lithology of an area. Throughout the Fort Irwin National Training Center area, 111 samples from both cored boreholes and surface outcrops were collected and processed for laboratory measurements. These samples...

Buesch, David C.; Bloss, Benjamin R.; Bedrosian, Paul A.
Bloss, B.R., and Bedrosian, P.A, 2015, Laboratory electrical resistivity analysis of geologic samples from Fort Irwin, California, chap. E of Buesch, D.C., ed., Geology and geophysics applied to groundwater hydrology at Fort Irwin, California: U.S. Geological Survey Open-file Report 2013-1024, 104 p., https://doi.org/10.3133/ofr20131024E.

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Year Published: 2015

Metal Mixture Modeling Evaluation project: 2. Comparison of four modeling approaches

As part of the Metal Mixture Modeling Evaluation (MMME) project, models were developed by the National Institute of Advanced Industrial Science and Technology (Japan), the U.S. Geological Survey (USA), HDR⎪HydroQual, Inc. (USA), and the Centre for Ecology and Hydrology (UK) to address the effects of metal mixtures on biological responses of...

Farley, Kevin J.; Meyer, Joe; Balistrieri, Laurie S.; DeSchamphelaere, Karl; Iwasaki, Yuichi; Janssen, Colin; Kamo, Masashi; Lofts, Steve; Mebane, Christopher A.; Naito, Wataru; Ryan, Adam C.; Santore, Robert C.; Tipping, Edward

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Year Published: 2015

Environmental assessment of water, sediment, and biota collected from the Bear Creek watershed, Colusa County, California

The Cache Creek watershed lies within California's North Coast Range, an area with abundant geologic sources of mercury (Hg) and a long history of Hg contamination (Rytuba, 2000). Bear Creek, Cache Creek, and the North Fork of Cache Creek are the major streams of the Cache Creek watershed, encompassing 2978 km2. The Cache Creek watershed contains...

Rytuba, James J.; Hothem, Roger L.; Brussee, Brianne E.; Goldstein, Daniel; May, Jason T.
Rytuba, J.J., Hothem, R.L., Brussee, B.E., Goldstein, D.N., and May, J.T., 2015, Environmental assessment of water, sediment, and biota collected from the Bear Creek watershed, Colusa County, California: U.S. Geological Survey Open-File Report 2013–1070, 83 p., http://dx.doi.org/10.3133/ofr20131070.

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Year Published: 2015

Detrital zircon U-Pb reconnaissance of the Franciscan subduction complex in northwestern California

In northwestern California, the Franciscan subduction complex has been subdivided into seven major tectonostratigraphic units. We report U-Pb ages of ≈2400 detrital zircon grains from 26 sandstone samples from 5 of these units. Here, we tabulate each unit's interpreted predominant sediment source areas and depositional age range, ordered...

Dimitru, Trevor; Ernst, W. Gary; Hourigan, Jeremy K.; McLaughlin, Robert J.

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Year Published: 2015

Geologic map of the Patagonia Mountains, Santa Cruz County, Arizona

The Patagonia Mountains contain two large porphyry Cu-Mo systems each with separate associated hypogene and supergene zones, two high-grade Cu-Mo breccia pipes, one large epithermal Ag-Pb-Zn-Mn deposit, and numerous additional areas of base- and precious-metal mineralization all zoned around a Laramide-age composite batholith of intermediate...

Graybeal, Frederick T.; Moyer, Lorre A.; Vikre, Peter G.; Dunlap, Pamela; Wallis, John C.
Graybeal, F.T., Moyer, L.A., Vikre, P.G., Dunlap, P., and Wallis, J.C., 2015, Geologic map of the Patagonia Mountains, Santa Cruz County, Arizona: U.S. Geological Survey Open-File Report 2015–1023, 10 p., 1 sheet, scale 1:48,000, http://dx.doi.org/10.3133/20151023.

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Year Published: 2015

Natural or Induced: Identifying Natural and Induced Swarms from Pre-production and Co-production Microseismic Catalogs at the Coso Geothermal Field

Increased levels of seismicity coinciding with injection of reservoir fluids have prompted interest in methods to distinguish induced from natural seismicity. Discrimination between induced and natural seismicity is especially difficult in areas that have high levels of natural seismicity, such as the geothermal fields at the Salton Sea and Coso,...

Schoenball, Martin; Kaven, J. Ole; Glen, Jonathan M. G.; Davatzes, Nicholas C.
M. Schoenball, J.O. Kaven, J.M.G. Glen and N.C. Davatzes (2015), Natural or Induced: Identifying Natural and Induced Swarms from Pre-production and Coproduction Microseismic Catalogs at the Coso Geothermal Field. In 39th Workshop on Geothermal Reservoir Engineering, Stanford, California.

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Year Published: 2015

A summary of the late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley, California

The late Cenozoic stratigraphic and tectonic history of the Santa Clara Valley illustrates the dynamic nature of the North American–Pacific plate boundary and its effect on basin and landscape development. Prior to early Miocene time, the area that became Santa Clara Valley consisted of eroding Franciscan complex basement structurally interleaved...

Langenheim, V.E.; Jachens, Robert C.; Wentworth, Carl M.; Graymer, Russell W.; Stanley, Richard G.; McLaughlin, Robert J.; Simpson, Robert W.; Williams, Robert A.; Andersen, D. W.; Ponce, David A.

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Year Published: 2015

Composite Sunrise Butte pluton: Insights into Jurassic–Cretaceous collisional tectonics and magmatism in the Blue Mountains Province, northeastern Oregon

The composite Sunrise Butte pluton, in the central part of the Blue Mountains Province, northeastern Oregon, preserves a record of subduction-related magmatism, arc-arc collision, crustal thickening, and deep-crustal anatexis. The earliest phase of the pluton (Desolation Creek unit) was generated in a subduction zone environment, as the oceanic...

Johnson, Kenneth H.; Schwartz, J.J.; Žák, Jiří; Verner, Krystof; Barnes, Calvin G.; Walton, Clay; Wooden, Joseph L.; Wright, James E.; Kistler, Ronald W.