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Intra-arc strike-slip fault exposed at batholithic levels in the southern Sierra Nevada, California

Busby-Spera, Cathy J. and Saleeby, Jason (1990) Intra-arc strike-slip fault exposed at batholithic levels in the southern Sierra Nevada, California. Geology, 18 (3). pp. 255-259. ISSN 0091-7613. doi:10.1130/0091-7613(1990)018<0255:IASSFE>2.3.CO;2.

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The Kern Canyon fault is a major north-trending fault that is continuous for a distance of 140 km in the southern Sierra Nevada, California. Previous geologic mapping and geochronological work along the northern third of the fault indicate that dextral offset occurred sometime after 80 Ma and before 3.5 Ma; this offset was interpreted to be the result of Cenozoic basin-and-range extension. Our new results from the central third of the fault (Kernville-Lake Isabella region) indicate an earlier right-lateral movement history, contemporaneous with emplacement of the largest plutons in the Sierra Nevada. The older structure is termed the proto-Kern Canyon fault zone. The Cenozoic fault trace is a narrow zone of brittle deformation, whereas the Cretaceous fault zone is a broad zone of ductile deformation. U-Pb zircon geochronology on plutonic and metavolcanic rocks involved in the ductile deformation, as well as a pluton that postdates ductile deformation, demonstrate that the proto-Kern Canyon fault zone was active at 85 Ma, and may have begun to move as early as 105 Ma. Longitudinal strike-slip faults are common in modern magmatic arcs where convergence is oblique. The proto-Kern Canyon fault zone may have originated in response to a moderate northward component in subduction of the Farallon plate or perhaps a strong northward component for the Kula plate.

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Additional Information:© 1990 Geological Society of America. Manuscript received May 24, 1989; Revised manuscript received September 25, 1989; Manuscript accepted October 10, 1989. Supported by National Science Foundation Grants EAR-8519124 and EAR-8803769 to Busby-Spera and EAR-8218460 and EAR-8419731 to Saleeby. Field mapping was partly accomplished in conjunction with California Institute of Technology field courses. We thank R. Kistler, J. Wright, and J. Moore for reviews of the manuscript.
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Issue or Number:3
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Official Citation:Cathy J. Busby-Spera and Jason B. Saleeby Intra-arc strike-slip fault exposed at batholithic levels in the southern Sierra Nevada, California Geology, March, 1990, v. 18, p. 255-259, doi:10.1130/0091-7613(1990)018<0255:IASSFE>2.3.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48837
Deposited By: Tony Diaz
Deposited On:25 Aug 2014 16:58
Last Modified:10 Nov 2021 18:36

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