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Pre-Pliocene Extension around the Gulf of California and the transfer of Baja California to the Pacific Plate

Stock, J. M. and Hodges, K. V. (1989) Pre-Pliocene Extension around the Gulf of California and the transfer of Baja California to the Pacific Plate. Tectonics, 8 (1). pp. 99-115. ISSN 0278-7407. doi:10.1029/TC008i001p00099.

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Late Miocene (12–5 Ma) extension around the edges of the Gulf of California has been alternatively attributed to “Basin and Range” extension, back arc extension, or development of the Pacific-North America plate boundary. This extension was ENE directed and similar in structural style to extension in the Basin and Range province. Timing constraints permit nearly synchronous onset of this deformation in a belt extending SSE from northernmost Baja California to the mouth of the gulf. Where this extensional faulting continued through Pliocene time to the present, synchronous with motion on the modern transform plate boundary in the Gulf of California, no change in direction of extension can be resolved. Revised constraints on Pacific-North America plate motion support the development of this late Miocene extension as a component of Pacific-North America displacement that could not be accommodated by strike-slip displacement along the existing plate boundary west of the Baja California peninsula. This scenario implies that transfer of Baja California from the North America plate to the Pacific plate was a gradual process, beginning about 12–10 Ma, when motion of the Pacific plate relative to North America was partitioned into separate regimes of strike-slip and dip-slip displacement on opposite sides of Baja California.

Item Type:Article
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URLURL TypeDescription
Stock, J. M.0000-0003-4816-7865
Hodges, K. V.0000-0003-2805-8899
Additional Information:© 1989 by the American Geophysical Union. (Received July 11, 1988; revised September 27, 1988; accepted September 30, 1988. Paper number 88TC03753. Tanya Atwater, Christopher Henry, and Peter Lonsdale provided preprints in advance of publication. Jeff Severinghaus provided magnetic anomaly identifications in advance of publication. Gordon Gastil, Dick Sedlock, and Hugh McLean reviewed the manuscript. T. Byrne, B.C. Burchfiel, W. F. Brace, and T. Grove made helpful suggestions J. M. Stock was supported by a Fannie and John Hertz Foundation Fellowship. Acknowledgment is made to the Donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
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Fannie and John Hertz FoundationUNSPECIFIED
American Chemical Society Petroleum Research FundUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20140905-141154013
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Official Citation:Stock, J. M., and K. V. Hodges (1989), Pre-Pliocene Extension around the Gulf of California and the transfer of Baja California to the Pacific Plate, Tectonics, 8(1), 99–115, doi:10.1029/TC008i001p00099.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49299
Deposited By: Ruth Sustaita
Deposited On:05 Sep 2014 21:56
Last Modified:10 Nov 2021 18:42

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