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Year Published: 2016

High-resolution gravity and seismic-refraction surveys of the Smoke Tree Wash area, Joshua Tree National Park, California

We describe high-resolution gravity and seismic refraction surveys acquired to determine the thickness of valley-fill deposits and to delineate geologic structures that might influence groundwater flow beneath the Smoke Tree Wash area in Joshua Tree National Park. These surveys identified a sedimentary basin that is fault-controlled. A profile...

Langenheim, Victoria E.; Rymer, Michael J.; Catchings, Rufus D.; Goldman, Mark R.; Watt, Janet T.; Powell, Robert E.; Matti, Jonathan C.
Langenheim, V.E., Rymer, M.J., Catchings, R.D., Goldman, M.R., Watt, J.T., Powell, R.E., and Matti, J.C., 2016, High-resolution gravity and seismic-refraction surveys of the Smoke Tree Wash Area, Joshua Tree National Park, California: U.S. Geological Survey Open-File Report 2016–1027, 15 p., http://dx.doi.org/10.3133/ofr20161027.

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Year Published: 2016

Holocene climate variability and anthropogenic impacts from Lago Paixban, a perennial wetland in Peten, Guatemala

Analyses of an ~ 6 m sediment core from Lago Paixban in Peten, Guatemala, document the complex evolution of a perennial wetland over the last 10,300 years. The basal sediment is comprised of alluvial/colluvial fill deposited in the early Holocene. The absence of pollen and gastropods in the basal sediments suggests intermittently dry conditions...

Wahl, David B.; Hansen, Richard D.; Byrne, Roger; Anderson, Lysanna; Schreiner, T.
Wahl, D., Hansen, R.D., Byrne, R., Anderson, L., 2015. Holocene Climate Variability and Anthropogenic Impacts from Lago Paixban, a Perennial Wetland in Peten, Guatemala. Global and Planetary Change 138, 70-81. http://dx.doi.org/10.1016/j.gloplacha.2015.09.011

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Year Published: 2016

Structure of the Hat Creek graben region: Implications for the structure of the Hat Creek graben and transfer of right-lateral shear from the Walker Lane north of Lassen Peak, northern California, from gravity and magnetic anomalies

Interpretation of magnetic and new gravity data provides constraints on the geometry of the Hat Creek Fault, the amount of right-lateral offset in the area between Mt. Shasta and Lassen Peak, and confirmation of the influence of pre-existing structure on Quaternary faulting. Neogene volcanic rocks coincide with short-wavelength magnetic anomalies...

Langenheim, Victoria; Jachens, Robert C.; Clynne, Michael A.; Muffler, L. J. Patrick
Langenheim, V.E., Jachens, R.C., Muffler, L.P.J., and Clynne, M.A., 2015, Structure of the Hat Creek graben region: Implications for the structure of the Hat Creek graben and transfer of right-lateral shear from the Walker Lane north of Lassen Peak, northern California, from gravity and magnetic anomalies: Geosphere, v. 12, no. 3, 19 p.

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Year Published: 2016

Wetting and drying of soil in response to precipitation: Data analysis, modeling, and forecasting

This paper investigates methods to analyze and forecast soil moisture time series. We extend an existing Antecedent Water Index (AWI) model, which expresses soil moisture as a function of time and rainfall. Unfortunately, the existing AWI model does not forecast effectively for time periods beyond a few hours. To overcome this limitation, we...

Basak, Aniruddha; Kulkarni, Chinmay; Schmidt, Kevin M.; Mengshoel, Ole

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Year Published: 2016

Book review: Mineral resource estimation

Mineral Resource Estimation is about estimating mineral resources at the scale of an ore deposit and is not to be mistaken with mineral resource assessment, which is undertaken at a significantly broader scale, even if similar data and geospatial/geostatistical methods are used. The book describes geological, statistical, and geostatistical tools...

Mihalasky, Mark J.

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Year Published: 2016

Apatite fission-track evidence for regional exhumation in the subtropical Eocene, block faulting, and localized fluid flow in east-central Alaska

The origin and antiquity of the subdued topography of the Yukon–Tanana Upland (YTU), the physiographic province between the Denali and Tintina faults, are unresolved questions in the geologic history of interior Alaska and adjacent Yukon. We present apatite fission-track (AFT) results for 33 samples from the 2300 km2 western Fortymile...

Dusel-Bacon, Cynthia; Bacon, Charles R.; O'Sullivan, Paul B.; Day, Warren C.
Dusel-Bacon, C., Bacon, C.R., O’Sullivan, P.B., and Day, W.C., 2016, Apatite fission-track evidence for regional exhumation in the subtropical Eocene, block faulting, and localized fluid flow in east-central Alaska. Canadian Journal of Earth Sciences, v.53, p. 260–280, dx.doi.org/10.1139/cjes-2015-0138. http://www.nrcresearchpress.com/doi/pdf/10.1139/cjes-2015-0138

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Year Published: 2016

Relations between rainfall–runoff-induced erosion and aeolian deposition at archaeological sites in a semi-arid dam-controlled river corridor

Process dynamics in fluvial-based dryland environments are highly complex with fluvial, aeolian, and alluvial processes all contributing to landscape change. When anthropogenic activities such as dam-building affect fluvial processes, the complexity in local response can be further increased by flood- and sediment-limiting flows. Understanding...

Collins, Brian D.; Bedford, David; Corbett, Skye C.; Fairley, Helen C.; Cronkite-Ratcliff, Collin
Collins, B. D., Bedford, D. R., Corbett, S. C., Cronkite-Ratcliff, C., and Fairley, H. C. (2016) Relations between rainfall–runoff-induced erosion and aeolian deposition at archaeological sites in a semi-arid dam-controlled river corridor. Earth Surf. Process. Landforms, 41(7): 899–917. doi: 10.1002/esp.3874.

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Year Published: 2016

Reconnaissance sediment budget for selected watersheds of West Maui, Hawai‘i

Episodic runoff brings suspended sediment to the nearshore waters of West Maui, Hawaiʻi. Even small rainfalls create visible plumes over a few hours. We used mapping, field experiments, and analysis of recent (July 19–20, 2014) and historic rainfall to estimate sources of land-based pollution for two watersheds in West Maui: Honolua, and...

Stock, Jonathan D.; Falinski, Kim A.; Callender, Tova
Stock, J.D., Falinksi, K.A., Callender, T., 2015, Reconnaissance sediment budget for selected watersheds of West Maui, Hawai‘i: U.S. Geological Survey Open-File Report 2015–1190, 42 p., http://www.dx.doi.org/10.3133/ofr20151190.

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Year Published: 2016

Paleomagnetic record determined in cores from deep research wells in the Quaternary Santa Clara basin, California

Paleomagnetic study of cores from six deep wells provides an independent temporal framework for much of the alluvial stratigraphy of the Quaternary basin beneath the Santa Clara Valley. This stratigraphy consists of 8 upward-fining cycles in the upper 300 m of section and an underlying 150 m or more of largely fine-grained sediment. The eight...

Mankinen, Edward A.; Wentworth, Carl M.

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Year Published: 2016

Copper speciation in variably toxic sediments at the Ely Copper Mine, Vermont, United States

At the Ely Copper Mine Superfund site, Cu concentrations exceed background values in both streamwater (160–1200 times) and sediments (15–79 times). Previously, these sediment samples were incubated with laboratory test organisms, and they exhibited variable toxicity for different stream sites. In this study we combined bulk- and...

Kimball, Bryn E.; Foster, Andrea L.; Seal, Robert R. ; Piatak, Nadine M.; Webb, Samuel M.; Hammarstrom, Jane M.

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Year Published: 2016

Analysis and interpretation of stress indicators in deviated wells of the Coso Geothermal Field

Characterizing the tectonic stress field is an integral part of the development of hydrothermal systems and especially for enhanced geothermal systems (EGS). With a well characterized stress field the propensity of fault slip on faults with known location and orientation can be identified. Faults that are critically oriented for faulting with...

Schoenball, Martin; Glen, Jonathan M. G.; Davatzes, Nicholas C.
Schoenball, M., Glen, J. M. G., & Davatzes, N. C. (2016). Analysis and Interpretation of Stress Indicators in Deviated Wells of the Coso Geothermal Field. In 41st Workshop on Geiothermal Reservoir Engineering. Stanford, California.

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Year Published: 2016

By-products of porphyry copper and molybdenum deposits: Chapter 7

Porphyry Cu and porphyry Mo deposits are large to giant deposits ranging up to >20 and 1.6 Gt of ore, respectively, that supply about 60 and 95% of the world’s copper and molybdenum, as well as significant amounts of gold and silver. These deposits form from hydrothermal systems that affect 10s to >100 km3 of the upper crust and result...

Verplanck, Philip L.; Hitzman, Murray W.; John, David A.; Taylor, Ryan D.