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Passive-roof thrust model for the emplacement of the Pelona-Orocopia Schist in Southern California, United States

An Yin
Passive-roof thrust model for the emplacement of the Pelona-Orocopia Schist in Southern California, United States
Geology (Boulder) (February 2002) 30 (2): 183-186

Abstract

The early Tertiary Orocopia-Chocolate fault in southern California was originally interpreted as a southwest-directed thrust assisting tectonic underplating of the Orocopia Schist beneath North America during subduction. However, the predicted thrusting direction is opposite to that observed for the fault. Although this problem appeared to be resolved by interpreting the Orocopia-Chocolate fault as a normal fault, this alternative is inconsistent with the fact that neither an early Tertiary breakaway nor early Tertiary upper plate extension has been observed. I suggest that the fault was a northeast-directed passive-roof thrust that linked with a southwest-directed basal decollement (the Vincent thrust) during early Tertiary flat subduction of the Farallon plate beneath North America. This model may also explain a similar structural relationship between the Main Central thrust and the South Tibet detachment fault in the Himalaya.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 30
Serial Issue: 2
Title: Passive-roof thrust model for the emplacement of the Pelona-Orocopia Schist in Southern California, United States
Author(s): Yin, An
Affiliation: University of California at Los Angeles, Department of Earth and Space Sciences, Los Angeles, CA, United States
Pages: 183-186
Published: 200202
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 29
Accession Number: 2002-014653
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., sects., sketch maps
N32°49'60" - N33°40'00", W116°00'00" - W114°00'00"
N34°00'00" - N34°30'00", W118°00'00" - W117°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200206
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