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Year Published: 2015

Reconnaissance stratigraphic studies in the Susitna basin, Alaska, during the 2014 field season

The Susitna basin is a poorly-understood Cenozoic successor basin immediately north of Cook Inlet in south-central Alaska (Kirschner, 1994). The basin is bounded by the Castle Mountain fault and Cook Inlet basin on the south, the Talkeetna Mountains on the east, the Alaska Range on the north, and the Alaska–Aleutian Range on the west (fig. 2-1)....

LePain, David L.; Stanley, Richard G.; Harun, Nina T.; Helmold, Kenneth P.; Tsigonis, Rebekah
LePain, D.L., Stanley, R.G., Harun, N.T., Helmold, K.P., and Tsigonis, R.M., 2015, Reconnaissance stratigraphic studies in the Susitna basin, Alaska, during the 2014 field season, in Gillis, R.J., Overview of 2014 energy-focused studies in Susitna basin, south-central Alaska, and preliminary results: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2015-3-2, p. 5-10. doi: 10.14509/29466 , http://dggs.alaska.gov/pubs/id/29466

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Year Published: 2015

Stratigraphic reconnaissance of the Middle Jurassic Red Glacier Formation, Tuxedni Group, at Red Glacier, Cook Inlet, Alaska

The Alaska Division of Geological & Geophysical Surveys (DGGS) and U.S. Geological Survey (USGS) are implementing ongoing programs to characterize the petroleum potential of Cook Inlet basin. Since 2009 this program has included work on the Mesozoic stratigraphy of lower Cook Inlet, including the Middle Jurassic Tuxedni Group between Tuxedni...

LePain, David L.; Stanley, Richard G.
LePain, D.L., and Stanley, R.G., 2015, Stratigraphic reconnaissance of the Middle Jurassic Red Glacier Formation, Tuxedni Group, at Red Glacier, Cook Inlet, Alaska, in Wartes, M.A., Energy-related studies during the 2014 field season, western Cook Inlet, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2015-5-5, p. 23-28. doi:10.14509/29460, http://dggs.alaska.gov/pubs/id/29460

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Year Published: 2015

Geologic maps of the eastern Alaska Range, Alaska (1:63,360 scale)

This report provides a description of map units for a suite of 44 inch-to-mile (1:63,360-scale) geologic quadrangle maps of the eastern Alaska Range. This report also contains a geologic and tectonic summary and a comprehensive list of references pertaining to geologic mapping and specialized studies of the region. In addition to the geologic maps...

Nokleberg, Warren J.; Aleinikoff, John N.; Bond, Gerard C.; Ferrians, Oscar J.; Herzon, Paige L.; Lange, Ian M.; Miyaoka, Ronny T.; Richter, Donald H.; Schwab, Carl E.; Silva, Steven R.; Smith, Thomas E.; Zehner, Richard E.
Nokleberg, W.J., Aleinikoff, J.N., Bond, G.C., Ferrians, O.J., Jr., Lange, I.M., Miyaoka, R.T., Richter, D.H., Silva, S.R., Schwab, C.E., Smith, T.E., Stout, J.H., and Zehner, R.E., 2014, Geologic maps of the eastern Alaska Range, Alaska: Alaska Division of Geological & Geophysical Surveys Report of Investigations 2014-XX, 75 p., 45 sheets, scale 1:63,360.

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Year Published: 2015

Architecture and evolution of an Early Permian carbonate complex on a tectonically active island in east-central California

The newly named Upland Valley Limestone represents a carbonate complex that developed on and adjacent to a tectonically active island in east-central California during a brief interval of Early Permian (late Artinskian) time. This lithologically unique, relatively thin limestone unit lies within a thick sequence of predominantly siliciclastic...

Stevens, Calvin H.; Magginetti, Robert T.; Stone, Paul
Stevens, C.H., Magginetti, R.T., and Stone, P., 2015, Architecture and evolution of an Early Permian carbonate complex on a tectonically active island in east-central California: Stratigraphy, v. 12, no. 2, p. 167-182.

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Year Published: 2015

Regional implications of new chronostratigraphic and paleogeographic data from the Early Permian Darwin Basin, east-central California

The Darwin Basin developed in response to episodic subsidence of the western margin of the Cordilleran continental shelf from Late Pennsylvanian (Gzhelian) to Early Permian (late Artinskian) time. Subsidence of the basin was initiated in response to continental truncation farther to the west and was later augmented by thrust emplacement of the...

Stevens, Calvin H.; Stone, Paul; Magginetti, Robert T.
Stevens, C.H., Stone, P., and Magginetti, R.T., 2015, Regional implications of new chronostratigraphic and paleogeographic data from the Early Permian Darwin Basin, east-central California: Stratigraphy, v. 12, no. 2, p. 149-166.

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Year Published: 2015

Stratigraphy and paleogeographic significance of a Late Pennsylvanian to Early Permian channeled slope sequence in the Darwin Basin, southern Darwin Hills, east-central California

The complex stratigraphy of late Paleozoic rocks in the southern Darwin Hills consists of regionally extensive Mississippian and Early to Middle Pennsylvanian rocks overlain by latest Pennsylvanian to Early Permian rocks, herein called the Darwin Hills sequence. Deposition of this latter sequence marked the beginning of the Darwin Basin. In...

Stevens, Calvin H.; Stone, Paul; Magginetti, Robert T.; Ritter, Scott M.
Stevens, C.H., Stone, P., Magginetti, R.T., and Ritter, S.M., Stratigraphy and paleogeographic significance of a Late Pennsylvanian to Early Permian channeled slope sequence in the Darwin Basin, southern Darwin Hills, east-central California: Stratigraphy, v. 12, no. 2, p. 185-196.

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Year Published: 2015

Petrology and reservoir quality of the Gaikema Sandstone: Initial impressions

The Division of Geological & Geophysical Surveys (DGGS) and Division of Oil & Gas (DOG) are currently conducting a study of the hydrocarbon potential of Cook Inlet basin (LePain and others, 2011). The Tertiary stratigraphic section of the basin includes coal-bearing units that are prolific gas reservoirs, particularly the Neogene...

Helmold, Kenneth P.; Stanley, Richard G.
Helmold, K.P., and Stanley, R.G., 2015, Petrology and reservoir quality of the Gaikema Sandstone: initial impressions, in Wartes, M.A., Energy-related studies during the 2014 field season, western Cook Inlet, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2015-5-7, p. 43-48. doi:10.14509/29462, http://dggs.alaska.gov/pubs/id/29462

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Year Published: 2015

Probabilistic 3-D time-lapse inversion of magnetotelluric data: Application to an enhanced geothermal system

Surface-based monitoring of mass transfer caused by injections and extractions in deep boreholes is crucial to maximize oil, gas and geothermal production. Inductive electromagnetic methods, such as magnetotellurics, are appealing for these applications due to their large penetration depths and sensitivity to changes in fluid conductivity and...

Rosas-Carbajal, Marina; Linde, Nicolas; Peacock, Jared R.; Zyserman, F. I.; Kalscheuer, Thomas; Thiel, Stephan

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Year Published: 2015

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in Global mineral resource assessment

A probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in the Tethys region of western and southern Asia was carried out as part of a global mineral resource assessment led by the U.S. Geological Survey (USGS). The purpose of the study was to delineate geographic areas as permissive tracts for the...

Zientek, Michael L.; Hammarstrom, Jane M.; Johnson, Kathleen M.; Zürcher, Lukas; Bookstrom, Arthur A.; Hammarstrom, Jane M.; Mars, John C.; Ludington, Stephen; Zientek, Michael L.; Dunlap, Pamela; Wallis, John C.; Drew, Lawrence J.; Sutphin, David M.; Berger, Byron R.; Herrington, Richard J.; Billa, Mario; Kuşcu, Ilkay; Moon, Charles J.; Richards, Jeremy P.
Zürcher, L., Bookstrom A.A., Hammarstrom, J.M., Mars, J.C., Ludington, S., Zientek, M.L., Dunlap, P., and Wallis, J.C., with contributions from Drew, L.J., Sutphin, D.M., Berger, B.R., Herrington, R.J., Billa, M., Kuşcu, I., Moon, C.J. ,and Richards, J.P., 2015, Porphyry copper assessment of the Tethys region of western and southern Asia: U.S. Geological Survey Scientific Investigations Report 2010–5090–V, 232 p., and spatial data, http://dx.doi.org/10.3133/sir20105090V.

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Year Published: 2015

Holocene environmental changes inferred from biological and sedimentological proxies in a high elevation Great Basin lake in the northern Ruby Mountains, Nevada, USA

Multi-proxy analyses were conducted on a sediment core from Favre Lake, a high elevation cirque lake in the northern Ruby Mountains, Nevada, and provide a ca. 7600 year record of local and regional environmental change. Data indicate that lake levels were lower from 7600-5750 cal yr BP, when local climate was warmer and/or drier than today....

Wahl, David B.; Starratt, Scott W.; Anderson, Lysanna; Kusler, Jennifer E.; Fuller, Christopher C.; Addison, Jason A.; Wan, Elmira
Wahl, D., Starratt, S., Anderson, L., Kusler, J., Fuller, C., Addison, J., & Wan, E. (2015). Holocene environmental changes inferred from biological and sedimentological proxies in a high elevation Great Basin lake in the northern Ruby Mountains, Nevada, USA. Quaternary International, 387, 87-98

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Year Published: 2015

Limiting age for the Provo shoreline of Lake Bonneville

Pluvial Lake Bonneville features a prominent shoreline at the Provo level, which has been interpreted as having formed during a period of threshold-stabilized overflow. The timing of Provo shoreline development is important for paleoclimate interpretations and for inferences on geomorphic process rates. Estimates for the timing of the shoreline...

Miller, David M.; Wahl, David B.; McGeehin, John; Rosario, Jose J.; Oviatt, Charles G.; Anderson, Lysanna; Presnetsova, Liubov S.
David M. Miller, David B. Wahl, John P. McGeehin, Jose Rosario, Charles G. Oviatt, Lysanna Anderson, Liubov Presnetsova, Limiting age for the Provo shoreline of Lake Bonneville, Quaternary International, Volume 387, 2015, Pages 99-105, ISSN 1040-6182, http://dx.doi.org/10.1016/j.quaint.2015.01.001. (http://www.sciencedirect.com/science/article/pii/S1040618215000075)

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Year Published: 2015

Imaging the magmatic system of Mono Basin, California with magnetotellurics in three--dimensions

A three–dimensional (3D) electrical resistivity model of Mono Basin in eastern California unveils a complex subsurface filled with zones of partial melt, fluid–filled fracture networks, cold plutons, and regional faults. In 2013, 62 broadband magnetotelluric (MT) stations were collected in an array around southeastern Mono Basin from...

Peacock, Jared R.; Mangan, Margaret T.; McPhee, Darcy K.; Ponce, David A.