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Patterns and modes of early Miocene crustal extension, central Mojave Desert, California

By
Roy K. Dokka
Roy K. Dokka
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Published:
January 01, 1986

The upper crust of the central Mojave Desert was extended and thinned during early Miocene time by three processes (1) low-angle normal faulting; (2) high-angle normal faulting in several episodes; and (3) extension fracturing. The first two processes appear to have affected the entire breadth of the extended area, but the third process was restricted to narrow zones. Processes 1 and 2 developed in at least two half-grabens that were kinematically linked by a transform fault. Each half-graben contains a family of similarly oriented high-angle normal faults that facilitated the extension of the upper crust. Evidence from one of the half-grabens suggests that the high-angle faults originally dipped at higher angles and were mechanically linked with a gently northeast-dipping normal fault (detachment).

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Contents

GSA Special Papers

Extensional Tectonics of the Southwestern United States: A Perspective on Processes and Kinematics

Larry Mayer
Larry Mayer
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Geological Society of America
Volume
208
ISBN print:
9780813722085
Publication date:
January 01, 1986

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