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ASARCO Incorporated’s Car Project, 1990-94, western Gabbs Valley, Mineral Co., Nevada: precious metal exploration transitioned to geothermal exploration ASARCO Incorporated’s Car Project, 1990-94, western Gabbs Valley, Mineral Co., Nevada: precious metal exploration transitioned to geothermal exploration
No abstract available.
Authors
Peter G. Vikre, Fleetwood Koutz
Paleomagnetic contributions to the Klamath Mountains terrane puzzle-a new piece from the Ironside Mountain batholith, northern California Paleomagnetic contributions to the Klamath Mountains terrane puzzle-a new piece from the Ironside Mountain batholith, northern California
We obtained paleomagnetic samples from six sites within the Middle Jurassic Ironside Mountain batholith (~170 Ma), which constitutes the structurally lowest part of the Western Hayfork terrane, in the Klamath Mountains province of northern California and southern Oregon. Structural attitudes measured in the coeval Hayfork Bally Meta-andesite were used to correct paleomagnetic data from...
Authors
Edward Mankinen, C. Gromme, W. Irwin
Physical, chemical, and isotopic data from groundwater in the watershed of Mirror Lake, and in the vicinity of Hubbard Brook, near West Thornton, New Hampshire, 1983 to 1997 Physical, chemical, and isotopic data from groundwater in the watershed of Mirror Lake, and in the vicinity of Hubbard Brook, near West Thornton, New Hampshire, 1983 to 1997
Research on the hydrogeologic setting of Mirror Lake near West Thornton, New Hampshire (43° 56.5’ N, 71° 41.5’ W), includes the study of the physical, chemical, and isotopic characteristics of groundwater in the vicinity of the lake and nearby Hubbard Brook. Presented here are those physical, chemical, and isotopic data for the period 1983 to 1997. Data were collected from observation...
Authors
James LaBaugh, Philip Harte, Allen Shapiro, Paul Hsieh, Carole Johnson, Daniel J. Goode, Warren W. Wood, Donald Buso, Gene Likens, Thomas Winter
Principal facts and an approach to collecting gravity data using near-real-time observations in the vicinity of Barstow, California Principal facts and an approach to collecting gravity data using near-real-time observations in the vicinity of Barstow, California
A gravity survey was done in the vicinity of Barstow, California, in which data were processed and analyzed in the field. The purpose of the data collection was to investigate possible changes in gravity across mapped Quaternary faults and to improve regional gravity coverage, adding to the existing national gravity database. Data were collected, processed, analyzed, and interpreted in...
Authors
G. Phelps, C. Cronkite-Ratcliff, L. Klofas
Crustal-scale recycling in caldera complexes and rift zones along the Yellowstone hotspot track: O and Hf isotopic evidence in diverse zircons from voluminous rhyolites of the Picabo volcanic field, Idaho Crustal-scale recycling in caldera complexes and rift zones along the Yellowstone hotspot track: O and Hf isotopic evidence in diverse zircons from voluminous rhyolites of the Picabo volcanic field, Idaho
Rhyolites of the Picabo volcanic field (10.4–6.6 Ma) in eastern Idaho are preserved as thick ignimbrites and lavas along the margins of the Snake River Plain (SRP), and within a deep (>3 km) borehole near the central axis of the Yellowstone hotspot track. In this study we present new O and Hf isotope data and U–Pb geochronology for individual zircons, O isotope data for major phenocrysts...
Authors
Dana Drew, Ilya Bindeman, Kathryn Watts, Axel K. Schmitt, Bin Fu, Michael McCurry
Simulated tsunami inundation for a range of Cascadia megathrust earthquake scenarios at Bandon, Oregon, USA Simulated tsunami inundation for a range of Cascadia megathrust earthquake scenarios at Bandon, Oregon, USA
Characterizations of tsunami hazards along the Cascadia subduction zone hinge on uncertainties in megathrust rupture models used for simulating tsunami inundation. To explore these uncertainties, we constructed 15 megathrust earthquake scenarios using rupture models that supply the initial conditions for tsunami simulations at Bandon, Oregon. Tsunami inundation varies with the amount and
Authors
Robert C. Witter, Yinglong Zhang, Kelin Wang, George R. Priest, Chris Goldfinger, Laura Stimely, John English, Paul Ferro
Chronology and provenance of last-glacial (Peoria) loess in western Iowa and paleoclimatic implications Chronology and provenance of last-glacial (Peoria) loess in western Iowa and paleoclimatic implications
Geologic archives show that the Earth was dustier during the last glacial period. One model suggests that increased gustiness (stronger, more frequent winds) enhanced dustiness. We tested this at Loveland, Iowa, one of the thickest deposits of last-glacial-age (Peoria) loess in the world. Based on K/Rb and Ba/Rb, loess was derived not only from glaciogenic sources of the Missouri River...
Authors
Daniel Muhs, E. Arthur Bettis, Helen Roberts, Stephen Harlan, James Paces, Richard L. Reynolds
Colorado geology then and now: Following the route of the Colorado Scientific Society’s 1901 trip through central Colorado Colorado geology then and now: Following the route of the Colorado Scientific Society’s 1901 trip through central Colorado
In 1901, Charles Van Hise asked Samuel Emmons and Whitman Cross to organize a grand excursion across Colorado as part of the combined meeting of the American Association for the Advancement of Science, GSA, and the Colorado Scientific Society (CSS). This trip replays part of that 10-day excursion across Colorado. Shortened to three days, this trip takes in some of the same sites as the...
Authors
Beth Simmons
Climate change's impact on key ecosystem services and the human well-being they support in the US Climate change's impact on key ecosystem services and the human well-being they support in the US
Climate change alters the functions of ecological systems. As a result, the provision of ecosystem services and the well-being of people that rely on these services are being modified. Climate models portend continued warming and more frequent extreme weather events across the US. Such weather-related disturbances will place a premium on the ecosystem services that people rely on. We...
Authors
Erik Nelson, Peter Kareiva, Mary Ruckelshaus, Katie Arkema, Gary Geller, Evan Girvetz, Dave Goodrich, Virginia Matzek, Malin Pinsky, Walt Reid, Martin Saunders, Darius Semmens, Heather Tallis
Evaluation of Pleistocene groundwater flow through fractured tuffs using a U-series disequilibrium approach, Pahute Mesa, Nevada, USA Evaluation of Pleistocene groundwater flow through fractured tuffs using a U-series disequilibrium approach, Pahute Mesa, Nevada, USA
Groundwater flow through fractured felsic tuffs and lavas at the Nevada National Security Site represents the most likely mechanism for transport of radionuclides away from underground nuclear tests at Pahute Mesa. To help evaluate fracture flow and matrix–water exchange, we have determined U-series isotopic compositions on more than 40 drill core samples from 5 boreholes that represent...
Authors
James Paces, Paul Nichols, Leonid Neymark, Harihar Rajaram
Oceanographic controls on sedimentary and geochemical facies on the Peru outer shelf and upper slope Oceanographic controls on sedimentary and geochemical facies on the Peru outer shelf and upper slope
Concentrations and characteristics of organic matter in surface sediments deposited under an intense oxygen-minimum zone (OMZ) on the Peru margin were mapped and studied in samples from deck-deployed box cores and push cores acquired by submersible on two east-west transects spanning depths of 75 to 1,000 meters (m) at 12°S and 13.5°S. On the basis of sampling and analyses of the top 1–2
Authors
Michael Arthur, Walter Dean
Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data Previously unrecognized regional structure of the Coastal Belt of the Franciscan Complex, northern California, revealed by magnetic data
Magnetic anomalies provide surprising structural detail within the previously undivided Coastal Belt, the westernmost, youngest, and least-metamorphosed part of the Franciscan Complex of northern California. Although the Coastal Belt consists almost entirely of arkosic graywacke and shale of mainly Eocene age, new detailed aeromagnetic data show that it is pervasively marked by long...
Authors
Victoria E. Langenheim, Robert Jachens, Carl Wentworth, Robert McLaughlin