Geology, Minerals, Energy, and Geophysics Science Center

Publications

Filter Total Items: 2,228
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Year Published: 2020

Cordilleran subduction initiation: Retro-arc timing and basinal response in the Inyo Mountains, eastern California

Subduction zones drive plate tectonics on Earth, yet subduction initiation and the related upper plate depositional and structural kinematics remain poorly understood because upper plate records are rare and often strongly overprinted by magmatism and deformation. During the late Paleozoic time, Laurentia’s western margin was truncated by a...

Lodes, Emma; Riggs, Nancy R.; Smith, Michael E.; Stone, Paul

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Year Published: 2020

Phasing of millennial-scale climate variability in the Pacific and Atlantic Oceans

New radiocarbon and sedimentological results from the Gulf of Alaska document recurrent millennial-scale episodes of reorganized Pacific Ocean ventilation synchronous with rapid Cordilleran Ice Sheet discharge, indicating close coupling of ice-ocean dynamics spanning the past 42,000 years. Ventilation of the intermediate-depth North Pacific tracks...

Walczak, Maureen; Mix, Alan; Cowan, Ellen; Fallon, Stewart; Fitfield, Keith; Alder, Jay R.; Du, Jianghui; Haley, Brian; Hobern, Tim; Padman, June; Praetorius, Summer K.; Schmittner, Andreas; Stoner, Joseph; Zellers, Sarah

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Year Published: 2020

Meeting the challenge: U.S. Geological Survey North Atlantic and Appalachian Region fiscal year 2020 in review

The utilization, preservation, and conservation of the Nation’s resources requires well-informed management decisions. The North Atlantic and Appalachian Region (NAAR) of the U.S. Geological Survey (USGS) supports science-based decision making for Federal, State, and local policymakers to meet the challenges of today and into the future. The...

U.S. Geological Survey, 2020, Meeting the challenge—U.S. Geological Survey North Atlantic and Appalachian Region fiscal year 2020 in review: U.S. Geological Survey General Information Product 207, 20 p., https://doi.org/10.3133/gip207.

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Year Published: 2020

Deglaciation of the Puget Lowland, Washington

Recently obtained radiocarbon ages from the southern Puget Lowland and reevaluation of limiting ages from the Olympic Peninsula in the light of new light detection and ranging (LiDAR) data suggest that the Juan de Fuca and Puget lobes of the Cordilleran ice sheet reached their maximum extents after 16,000 calibrated yr B.P. Source areas for both...

Haugerud, Ralph

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Year Published: 2020

Diverse cataclysmic floods from Pleistocene glacial Lake Missoula

In late Wisconsin time, the Purcell Trench lobe of the Cordilleran ice sheet dammed the Clark Fork of the Columbia River in western Montana, creating glacial Lake Missoula. During part of this epoch, the Okanogan lobe also dammed the Columbia River downstream, creating glacial Lake Columbia in northeast Washington. Repeated failure of the Purcell...

Denlinger, Roger P.; George, David L.; Cannon, Charles; O'Connor, Jim E.; Waitt, Richard B.

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Year Published: 2020

Getting to the root of plant‐mediated methane emissions and oxidation in a thermokarst bog

Vascular plants are important in the wetland methane cycle, but their effect on production, oxidation, and transport has high uncertainty, limiting our ability to predict emissions. In a permafrost‐thaw bog in Interior Alaska, we used plant manipulation treatments, field‐deployed planar optical oxygen sensors, direct measurements of methane...

Turner, Jesse C; Moorberg, Colby J; Wong, Andrea; Shea, Kathleen; Waldrop, Mark; Turetsky, Merritt R.; Neumann, Rebecca B.

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Year Published: 2020

Surficial geologic map of the Spirit Mountain SE and part of the Spirit Mountain NE 7.5' quadrangles, Nevada and Arizona

This geologic map includes a trove of stratigraphic and geomorphic information that chronicles the inception and evolution of the lower Colorado River. The map area is located near the south end of the Lake Mead National Recreation Area about 80 km (50 mi) downstream from Hoover Dam. It spans parts of northwestern Arizona and southern Nevada near...

House, Kyle; Crow, Ryan S.; Pearthree, Philip A; Brock-Hon, Amy L.; Schwing, Jonathan; Thacker, Jacob O.; Gootee, Brian F.
House, P.K., Crow, R.S., Pearthree, P.A., Brock-Hon, A.L., Schwing, J., Thacker, J.O., and Gootee, B.F., 2020, Surficial geologic map of the Spirit Mountain SE and part of the Spirit Mountain NE 7.5' quadrangles, Nevada and Arizona: U.S. Geological Survey Scientific Investigations Map 3448, pamphlet 30 p., scale 1:24,000, https://doi.org/10.3133/sim3448.

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Year Published: 2020

Geologic map of the greater Portland metropolitan area and surrounding region, Oregon and Washington

The Portland-Vancouver-Hillsboro Metropolitan Area (metro area) has great scenic, natural, and cultural resources and is the major economic hub of Oregon. The metro area is subject to a variety of geologic hazards. Underthrusting of the oceanic plate along the Cascadia plate boundary fault, or megathrust, deforms the leading edge of North America...

Wells, Ray; Haugerud, Ralph A.; Niem, Alan R.; Niem, Wendy A.; Ma, Lina; Evarts, Russell C.; O'Connor, Jim E.; Madin, Ian P.; Sherrod, David R.; Beeson, Marvin H.; Tolan, Terry L.; Wheeler, Karen L.; Hanson, William B.; Sawlan, Michael G.
Wells, R.E., Haugerud, R.A., Niem, A.R., Niem, W.A., Ma, L., Evarts, R.C., O’Connor, J.E., Madin, I.P., Sherrod, D.R., Beeson, M.H., Tolan, T.L., Wheeler, K.L., Hanson, W.B., and Sawlan, M.G., 2020, Geologic map of the greater Portland metropolitan area and surrounding region, Oregon and Washington: U.S. Geological Survey Scientific Investigations Map 3443, pamphlet 55 p., 2 sheets, scale 1:63,360, https://doi.org/10.3133/sim3443.

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Year Published: 2020

Linking mesoscale meteorology with extreme landscape response: Effects of narrow cold frontal rainbands (NCFR)

Landscapes evolve in response to prolonged and/or intense precipitation resulting from atmospheric processes at various spatial and temporal scales. Whereas synoptic (large‐scale) features (e.g., atmospheric rivers and hurricanes) govern regional‐scale hydrologic hazards such as widespread flooding, mesoscale features such as thunderstorms or...

Collins, Brian D.; Oakley, N. S.; Perkins, Jonathan P; East, Amy E.; Corbett, Skye C.; Hatchett, Benjamin J.

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Year Published: 2020

A multiproxy database of western North American Holocene paleoclimate records

Holocene climate reconstructions are useful for understanding the diverse features and spatial heterogeneity of past and future climate change. Here we present a database of western North American Holocene paleoclimate records. The database gathers paleoclimate time series from 209 terrestrial and marine sites, including 382 individual proxy...

Routson, Cody C.; Kaufman, Darrell S.; McKay, Nicholas P.; Erb, Michael; Arcusa, S. H.; Brown, Kendrick; Kirby, Matthew E.; Marsicek, Jeremiah; Anderson, R. Scott; Jimenez-Moreno, Gonzalo; Rodysill, Jessica R. ; Lachniet, M. S.; Fritz, Sherilyn C.; Bennett, Joseph; Goman, Michelle F.; Metcalfe, Sarah E.; Galloway, J. M.; Schoups, G.; Wahl, David; Morris, Jesse L.; Staines-Urias, F.; Dawson, A.; Shuman, B. N.; Gavin, Daniel G.

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Year Published: 2020

Why did Great Basin Eocene magmatism generate Carlin-type gold deposits when extensive Jurassic to Middle Miocene magmatism did not? Lessons from the Cortez Region, Northern Nevada, USA

No abstract available.

Henry, Christopher D.; John, David A.; Heizler, Matt T.; Leonardson, Robert W.; Colgan, Joseph P.; Watts, Kathryn E.; Ressel, Michael W.; Cousens, Brian L.