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Northwest margin of California continental borderland: marine geology and tectonic evolution.

American Association of Petroleum Geologists Bulletin

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Abstract

The NW margin of the California continental border land consists of 2 NW-trending pre-Neogene lithologic belts blanketed by Miocene and younger strata. These represent facies corresponding to the subduction complex and forearc-basin deposits of a late Mesozoic and Paleogene continental-margin arc-trench system. The outer belt, which forms the acoustic basement is characterized by: 1) moderately high compressional velocities; 2) discordant and discontinuous seismic reflectors; and 3) nonfossiliferous and diverse rock types. Landward, the inner Great Valley sequence belt is characterized by: 1) intermediate compressional velocities; 2) concordant and relatively continuous reflectors, and 3) a thick turbidite sequence. Well-developed wrench-fault structures in overlying Miocene strata record a transition from Paleogene subduction to Neogene transform faulting. The timing of volcanism and uplift, and of the younger wrenching event, closely matches the plate-tectonic model of Atwater and Molnar.-from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Northwest margin of California continental borderland: marine geology and tectonic evolution.
Series title:
American Association of Petroleum Geologists Bulletin
Volume
65
Issue:
2
Year Published:
1981
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
191
Last page:
218
Number of Pages:
28