Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2481
Magnetic effects of maghemitization of oceanic crust Magnetic effects of maghemitization of oceanic crust
Both theoretical considerations and available experimental results indicate that magnetic effects of maghemitization are strongly dependent on the grain size of the originally unoxidized titanomagnetite. Maghemitization of single‐domain titanomagnetite results in a decrease in coercivity, an increase in susceptibility, and a large decrease in Q ratio. Maghemitization of multidomain...
Authors
M. Prevot, A. Lecaille, Edward A. Mankinen
Physical factors that could restrict mineral supply Physical factors that could restrict mineral supply
Stages in the metal supply process are affected by each of the following physical (geologic) factors: (1) geographic distribution of concentrations of potential ore minerals, (2) depth of these concentrations, (3) mineralogy, (4) grain size of the minerals, and (5) grade and (6) tonnages of the concentrations. For mineral deposits of each type in each geologic and political environment...
Authors
John H. DeYoung, Donald A. Singer
The relation between exploration economics and the characteristics of mineral deposits The relation between exploration economics and the characteristics of mineral deposits
No abstract available.
Authors
Donald A. Singer, D.L. Mosier
Research in the Geysers-Clear Lake geothermal area, Northern California Research in the Geysers-Clear Lake geothermal area, Northern California
The Geysers-Clear Lake area is one of two places in the world where major vapor-dominated hydrothermal reservoirs are commercially exploited for electric power production. Because energy can be extracted more efficiently from steam than from hot water, vapor-dominated systems are preferable for electric power generation, although most geothermal electric power facilities tap water...
Goals, strategies, priorities, and tasks of a national landslide hazard-reduction program Goals, strategies, priorities, and tasks of a national landslide hazard-reduction program
No abstract available.
Authors
Water Resources Division U.S. Geological Survey
By
Geology, Energy, and Minerals Mission Area, Natural Hazards Mission Area, Energy Resources Program, Landslide Hazards Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Geologic Hazards Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Regenerate faults of small Cenozoic offset as probable earthquake sources in the southeastern United States Regenerate faults of small Cenozoic offset as probable earthquake sources in the southeastern United States
No abstract available.
Authors
Carl M. Wentworth, Marcia Mergner-Keefer
Two examples of seismic zonation in the San Francisco Bay region Two examples of seismic zonation in the San Francisco Bay region
The science of earthquakes in complex, requiring data and research in seismology, geology, soil mechanics, geophysics, hydrology, and engineering. Nevertheless, if earthquake hazards are to be reduced, earth science information must be translated from scientific and technical language into a form that can be effectively used by planners and decisionmakers. Out of the need to use earth...
Authors
W. J. Kockelman, E. E. Brabb
Reconnaissance geologic map of the Topaz Lake 15 minute quadrangle, California and Nevada, with Quaternary geology Reconnaissance geologic map of the Topaz Lake 15 minute quadrangle, California and Nevada, with Quaternary geology
No abstract available.
Authors
David A. John, James Giusso, W. J. Moore, R. A. Armin, J. C. Dohrenwend
Drake Peak — A structurally complex rhyolite center in southeastern Oregon Drake Peak — A structurally complex rhyolite center in southeastern Oregon
The Drake Peak volcanic center of middle Miocene age, located about 25 km northeast of Lakeview, Oreg., is a structurally complex eruptive center that resulted from several episodes of intrusion and extrusion of rhyolite. Two thousand meters of andesite and basalt flows, lahars, and volcaniclastic rocks of late Eocene age, and of basaltic andesite, tuff, and flood basalts of Eocene to...
Authors
Ray E. Wells
Annual review of environmental geology Annual review of environmental geology
No abstract available.
Authors
R.N. Passero, E. E. Brabb
Tectonic relations of carbon dioxide discharges and earthquakes Tectonic relations of carbon dioxide discharges and earthquakes
CO2‐rich springs occur worldwide along major zones of seismicity. They are mostly in young orogenic belts, but some are in areas of rifting continental platforms. Analyses of 13C content indicate that much of the CO2 is derived from the mantle and that other important sources are the metamorphism of marine carbonate‐bearing sedimentary rocks and the degradation of organic material. The...
Authors
W. P. Irwin, Ivan Barnes