Aeromagnetic and gravity surveys in the Coso Range, California

Journal Article · Sat May 10 04:00:00 EDT 1980 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB085iB05p02491· OSTI ID:5195793

Plouff, D; Isherwood, W F

The effect of an underlying magma reservoir cannot be identified within the complex gravity pattern in the Coso Range, California. Rather, linear gravity contours, which suggest a regional tectonic origin, enclose the location of most of the volcanic activity of the Coso Range. Faults along the edges of northwest trending, magnetic blocks probably provided paths of minimum resistance to the ascending viscous magma that was extruded as rhyolite domes. Dense, magnetic rocks associated with a complex mafic pluton 9 km in diameter form a relatively impermeable north border of the Pleistocene volcanic field. A heat flow high nearly coincides with the west half of a 6-km-diameter magnetic low. A 2-km-diameter outcrop of a pre-Cenozoic silicic pluton, which has low magnetization compared to the surrounding metamorphic rocks, presumably typifies the rocks that underlie the magnetic low and heat flow high. Hydrothermal fluids may have destroyed some magnetite in the more magnetic wall rock, further reducing the magnetic intensity.

• Research Organization: U.S. Geological Survey, Menlo Park, California 94025
• OSTI ID: 5195793
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 85:B5; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
CALIFORNIA
COSO HOT SPRINGS
GEOLOGIC FAULTS
GEOLOGIC STRUCTURES
GEOMAGNETIC FIELD
GEOPHYSICAL SURVEYS
GRAVITY SURVEYS
HEAT FLOW
MAGMA
MAGNETIC FIELDS
MAGNETIC SURVEYS
NORTH AMERICA
SURVEYS
USA
WESTERN REGION