Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2337
Depth to basement and crustal structure of the northern Harrat Rahat volcanic field, Kingdom of Saudi Arabia, from gravity and aeromagnetic data
New gravity data reveal a prominent negative anomaly along the main vent axis of the northern Harrat Rahat volcanic field in the Kingdom of Saudi Arabia. The gravity low continues north of the volcanic field onto exposures of Proterozoic rocks, indicating that the low is caused not only by the volcanic field (and possibly underlying Cenozoic sediments), but also the underlying Proterozoic basement
Authors
Victoria E. Langenheim, Brent T. Ritzinger, Hani M. Zahran, Adel Shareef, Maher K. Al-Dhahry
Cenozoic tectonics of the western Arabia Plate related to harrat magmatism near Al Madīnah, Kingdom of Saudi Arabia
Sprawling volcanic fields, or harrats, in western Saudi Arabia have been emplaced during the past 30 million years following effusions of flood basalts in Ethiopia and Yemen. Although broadly associated with volcanism in three rift valleys (Red Sea, Gulf of Aden, and East African Rift Zone) radiating from the Afar depression, harrat abundance on the Arabian Peninsula indicates that volcanism is di
Authors
Andrew T. Calvert, Thomas W. Sisson
The Saudi Geological Survey-U.S. Geological Survey northern Harrat Rahat project—Styles, rates, causes, and hazards of volcanism near Al Madīnah al Munawwarah, Kingdom of Saudi Arabia
Active volcanic systems pose serious hazards to people and property including inundation and incineration by lava, blanketing by tephra (volcanic ash), exposure to noxious volcanic gases, and damage from shallow earthquakes triggered by ascending molten material (magma). To improve understanding of volcanism and associated seismicity on the western Arabia Plate, the Saudi Geological Survey and the
Authors
Thomas W. Sisson, Andrew T. Calvert, Walter D. Mooney
The magmatic origin of the Columbia River Gorge, USA
Along subduction zones, high-relief topography is associated with sustained volcanism parallel to the plate margin. However, the relationship between magmatism and mountain building in arcs is poorly understood. Here, we study patterns of surface deformation and correlated fluvial knickpoints in the Columbia River Gorge to link long-term magmatism to the uplift and ensuing topographic development
Authors
Nathaniel Klema, Leif Karlstrom, Charles M. Cannon, Chengxin Jiang, Jim E. O'Connor, Ray Wells, Brandon Schmandt
Preliminary geologic map of the Southern Santa Rosa Mountains and Borrego Badlands, San Diego County, Southern California
This investigation delineates the geologic framework of an area of 75 square kilometers (km2) located west of the Salton Sea in southern California (fig. 1, on sheet 1). The study area encompasses the south flank of the Santa Rosa Mountains and the eastern part of the Borrego Badlands (sheet 1). In this study area, regionally important stratigraphic and structural elements collectively inform the
Authors
Jarg R. Pettinga, Stephanie L. Dudash, Pamela M. Cossette
Neogene faulting, basin development, and relief generation in the southern Klamath Mountains (USA)
Development and evaluation of models for tectonic evolution in the Cascadia forearc require understanding of along-strike heterogeneity of strain distribution, uplift, and upper-plate characteristics. Here, we investigated the Neogene geologic record of the Klamath Mountains province in southernmost Cascadia and obtained apatite (U-Th)/He (AHe) thermochronology of Mesozoic plutons, Neogene graben
Authors
Melanie J. Michalak, Susan M. Cashman, Victoria Langenheim, Taylor C. Team, Dana J. Christensen
Geothermal Play Fairway Analysis, Part 2: GIS methodology
Play Fairway Analysis (PFA) in geothermal exploration originates from a systematic methodology developed within the petroleum industry and is based on a geologic, geophysical, and hydrologic framework of identified geothermal systems. We tailored this methodology to study the geothermal resource potential of the Snake River Plain and surrounding region, but it can be adapted to other geothermal re
Authors
Jacob DeAngelo, John W. Shervais, Jonathan M.G. Glen, Dennis Nielson, Sabodh Garg, Patrick Dobson, Erika Gasperikova, Eric Sonnenthal, Lee M. Liberty, Drew Lorenz Siler, James P. Evans
Unifying the Neoarchean Lac des Iles Complex and implications for the petrogenesis of Pd-enriched noritic breccia pipes in ancient arcs
No abstract available.
Authors
William D. Smith, L. Fay, M.L. Djon, Michael Jenkins, Y. Lin, Z. S. Yao, James E. Mungall
Melting at the base of the J-M Reef Package, Stillwater Complex
No abstract available.
Authors
Michael Jenkins, Stephen J. Barnes
Detrending Great Basin elevation to identify structural patterns for identifying geothermal favorability
Topography provides information about the structural controls of the Great Basin and therefore information that may be used to identify favorable structural settings for geothermal systems. The Nevada Machine Learning Project (NVML) tested the use of a digital elevation map (DEM) of topography as an input feature to predict geothermal system favorability. A recent study re-examines the NVML data,
Authors
Jacob DeAngelo, Erick Burns, Stanley Paul Mordensky, Cary Ruth Lindsey
Micropaleontological evidence of a submarine fan in the lower Coaledo Formation, Southwestern Oregon, USA
The middle Eocene lower Coaledo Formation was interpreted as ten shoaling upward delta-margin cycles based on sediments and macrofauna. The strata, however, contains deep-water foraminifers. Explanations to resolve this anomaly included reworking, bathymetric range extension, or upward migration of water masses. Paleoecology analysis of foraminifers indicates that the few shelf species are poorly
Authors
Kristin McDougall-Reid
Integrated geologic and geophysical modeling across the Bartlett Springs fault zone, northern California (USA): Implications for fault creep and regional structure
The rate and location at depth of fault creep are important, but difficult to characterize, parameters needed to assess seismic hazard. Here we take advantage of the magnetic properties of serpentinite, a rock type commonly associated with fault creep, to model its depth extent along the Bartlett Springs fault zone, an important part of the San Andreas fault system north of the San Francisco Bay,
Authors
Victoria Langenheim, Robert J. McLaughlin, Benjamin Melosh