Geology, Minerals, Energy, and Geophysics Science Center

Publications

Filter Total Items: 2,228
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Year Published: 2021

Redefining the age of the lower Colorado River, southwestern United States

Sanidine dating and magnetostratigraphy constrain the timing of integration of the lower Colorado River (southwestern United States and northern Mexico) with the evolving Gulf of California. The Colorado River arrived at Cottonwood Valley (Nevada and Arizona) after 5.24 Ma (during or after the Thvera subchron). The river reached the proto–Gulf of...

Crow, Ryan S.; Schwing, J.; Karlstrom, K. E.; Heizler, M.; Pearthree, P. A.; House, P. K.; Dulin, S.; Janecke, S. U.; Stelten, Mark E.; Crossey, L. J.

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Year Published: 2021

A combined microbial and ecosystem metric of carbon retention efficiency explains land cover-dependent soil microbial biodiversity–ecosystem function relationships

While soil organic carbon (C) is the foundation of productive and healthy ecosystems, the impact of the ecology of microorganisms on C-cycling remains unknown. We manipulated the diversity, applied here as species richness, of the microbial community present in similar soils on two contrasting land-covers—an adjacent pasture and forest—and...

Ernakovich, Jessica G.; Baldock, Jeffrey R; Creamer, Courtney; Sanderman, Jonathan; Kalbitz, Karsten; Farrell, Mark

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Year Published: 2021

National-scale reservoir thermal energy storage pre-assessment for the United States

The U.S. Geological Survey is performing a pre-assessment of the cooling potential for reservoir thermal energy storage (RTES) in five generalized geologic regions (Basin and Range, Coastal Plains, Illinois Basin, Michigan Basin, Pacific Northwest) across the United States. Reservoir models are developed for the metropolitan areas of eight cities...

Pepin, Jeff D.; Burns, Erick; Dickinson, Jesse E.; Duncan, Leslie L.; Kuniansky, Eve L.; Reeves, Howard W.

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Year Published: 2021

Subsurface characterization and machine learning predictions at Brady Hot Springs

Subsurface data analysis, reservoir modeling, and machine learning (ML) techniques have been applied to the Brady Hot Springs (BHS) geothermal field in Nevada, USA to further characterize the subsurface and assist with optimizing reservoir management. Hundreds of reservoir simulations have been conducted in TETRAD-G and CMG STARS to explore...

Koenraad F. Beckers; Duplyakin, Dmitry; Martin, Michael J.; Johnston, Henry E.; Siler, Drew L.

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Year Published: 2021

Airborne geophysical imaging of weak zones on Iliamna Volcano, Alaska: Implications for slope stability

Water‐saturated, hydrothermally altered rocks reduce the strength of volcanic edifices and increase the potential for sector collapses and far‐traveled mass flows of unconsolidated debris. Iliamna Volcano is an andesitic stratovolcano located on the western side of the Cook Inlet, ∼225 km southwest of Anchorage and is a source of repeated...

Peterson, Dana Elise; Finn, Carol A.; Bedrosian, Paul A.

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Year Published: 2021

Aeromagnetic map of Burney and the surrounding area, northeastern California

An aeromagnetic survey was conducted to improve understanding of the geology and structure in the area around Burney, northeastern California. The new data are a substantial improvement over existing data and reveal a prominent north northwest-trending magnetic grain that allows extension of mapped faults, delineation of plutons within the...

Langenheim, Victoria E.
Langenheim, V.E., 2021, Aeromagnetic map of Burney and the surrounding area, northeastern California: U.S. Geological Survey Open-File Report 2021–1006, 8 p., 1 sheet, scale 1:250:000, https://doi.org/10.3133/ofr20211006.

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Year Published: 2021

Paleoseismic trenching reveals late quaternary kinematics of the Leech River Fault: Implications for forearc strain accumulation in Northern Cascadia

New paleoseismic trenching indicates late Quaternary oblique right‐lateral slip on the Leech River fault, southern Vancouver Island, Canada, and constrains permanent forearc deformation in northern Cascadia. A south‐to‐north reduction in northward Global Navigation Satellite System velocities and seismicity across the Olympic Mountains, Strait of...

Harrichhausen, Nicolas; Morell, Kristin D.; Regalla, Christine; Bennett, Scott E. K.; Leonard, Lucinda J.; Lynch, Emerson M.; Nissen, Edwin

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Year Published: 2021

USGS permafrost research determines the risks of permafrost thaw to biologic and hydrologic resources

The U.S. Geological Survey (USGS), in collaboration with university, Federal, Tribal, and independent partners, conducts fundamental research on the distribution, vulnerability, and importance of permafrost in arctic and boreal ecosystems. Scientists, land managers, and policy makers use USGS data to help make decisions for development, wildlife...

Waldrop, Mark P.; Anderson, Lesleigh; Dornblaser, Mark; Erikson, Li H.; Gibbs, Ann E.; Herman-Mercer, Nicole M.; James, Stephanie R.; Jones, Miriam C.; Koch, Joshua C.; Leewis, Mary-Cathrine; Manies, Kristen L.; Minsley, Burke J.; Pastick, Neal J.; Patil, Vijay; Urban, Frank; Walvoord, Michelle A.; Wickland, Kimberly P.; Zimmerman, Christian
Waldrop, M.P., Anderson, L., Dornblaser, M., Erikson, L.H., Gibbs, A.E., Herman-Mercer, N.M., James, S.R., Jones, M.C., Koch, J.C., Leewis, M.-C., Manies, K.L., Minsley, B.J., Pastick, N.J., Patil, V., Urban, F., Walvoord, M.A., Wickland, K.P., and Zimmerman, C., 2021, USGS permafrost research determines the risks of permafrost thaw to biologic and hydrologic resources: U.S. Geological Survey Fact Sheet 2020-3058, 6 p., https://doi.org/10.3133/fs20203058.

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Year Published: 2021

Influence of pre-existing structure on pluton emplacement and geomorphology: The Merrimac plutons, northern Sierra Nevada, California (USA)

In much of the western Cordillera of North America, the geologic framework of crustal structure generated in the Mesozoic leaves an imprint on later plutonic emplacement, subsequent structural setting, and present landscape morphology. The Merrimac plutons in the northern Sierra Nevada (California, USA) are a good example of the influence of pre-...

Langenheim, Victoria; Vazquez, Jorge A.; Schmidt, Kevin; Guglielmo, Giovanni Jr.; Sweetkind, Donald S.

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Year Published: 2021

Linking modern pollen accumulation rates to biomass: Quantitative vegetation reconstruction in the western Klamath Mountains, NW California, USA

Quantitative reconstructions of vegetation abundance from sediment-derived pollen systems provide unique insights into past ecological conditions. Recently, the use of pollen accumulation rates (PAR, grains cm−2 year−1) has shown promise as a bioproxy for plant abundance. However, successfully reconstructing region-specific vegetation dynamics...

Knight, Clarke A.; Baskaran, Mark; Bunting, M. Jane; Champagne, Marie Rhondelle; Potts, Matthew D.; Wahl, David; Wanket, James; Battles, John J.

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Year Published: 2021

Eroding Cascadia— Sediment and solute transport and landscape denudation in western Oregon and northwestern California

Riverine measurements of sediment and solute transport give empirical basin-scale estimates of bed-load, suspended-sediment, and silicate-solute fluxes for 100,000 km2 of northwestern California and western Oregon. This spatially explicit sediment budget shows the multifaceted control of geology and physiography on the rates and processes of...

O'Connor, Jim E.; Mangano, Joseph F.; Wise, Daniel R.; Roering, Joshua R.

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Year Published: 2021

Oases: Finding hidden biodiversity gems in the southern Sonoran Desert

In the arid southern Sonoran Desert, the rugged canyons of the Sierra El Aguaje contain numerous freshwater oases. These habitats are supported by small springs which are usually located along geologic faults in volcanic and granitic bedrock. Genetic evidence from freshwater-obligate species (e.g., fish and frogs) suggests these or similar spring-...

Bogan, Michael T.; Ballesteros-Córdova, Carlos; Bennett, S.; Darin, Michael H.; Findley, Lloyd T.; Varela-Romero, Alejandro