Aeromagnetic and gravity surveys in the Coso Range, California

Journal of Geophysical Research B: Solid Earth
By:  and 

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Abstract

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.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Aeromagnetic and gravity surveys in the Coso Range, California
Series title Journal of Geophysical Research B: Solid Earth
DOI 10.1029/JB085iB05p02491
Volume 85
Issue B5
Year Published 1980
Language English
Publisher Wiley
Description 11 p.
First page 2491
Last page 2501
Country United States
State California
Other Geospatial Coso Range
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