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Rapid localization of Pacific–North America plate motion in the Gulf of California

Oskin, Michael and Stock, Joann and Martín-Barajas, Arturo (2001) Rapid localization of Pacific–North America plate motion in the Gulf of California. Geology, 29 (5). pp. 459-462. ISSN 0091-7613. doi:10.1130/0091-7613(2001)029<0459:RLOPNA>2.0.CO;2.

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Correlation of late Miocene volcaniclastic strata across the northern Gulf of California shows that the Pacific–North America plate boundary localized east of the Baja California peninsula ca. 6 Ma. Dextral offset of the 12.6 Ma Tuff of San Felipe and a pair of overlying ca. 6.3 Ma pyroclastic flows indicate at least 255 ± 10 km of displacement along an azimuth of 310°. Isopach and facies trends of the Tuff of San Felipe support no more than a few tens of kilometers of additional dextral displacement between 12.6 and 6.3 Ma. These constraints indicate that nearly all of the dextral displacement between the Pacific and North American plates prior to 6.3 Ma was accommodated outside of the gulf region, and by 4.7 Ma, the plate boundary motion was localized in the Gulf of California. Although continental extension has accounted for a component of plate boundary motion in northwestern Mexico since cessation of subduction offshore of southern Baja California at 12.5 Ma, transfer of Baja California to the Pacific plate was delayed by at least 6–7 m.y.

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URLURL TypeDescription<0459:RLOPNA>2.0.CO;2DOIArticle
Oskin, Michael0000-0002-6631-5326
Stock, Joann0000-0003-4816-7865
Additional Information:© 2001 Geological Society of America. Manuscript received August 17, 2000. Revised manuscript received January 22, 2001. Manuscript accepted January 29, 2001. Support was provided by National Science Foundation grants EAR-9614674 and EAR-0001248. We thank R.G. Gastil and C. Lewis for guidance with initial reconnaissance in Sonora, and J. Kirschvink for use of the Caltech Paleomagnetics Laboratory. We also appreciate the support of J. Roldán-Quintana and C. González-Leόn of the Universidad Nacional Autόnoma de México. Permission to enter Isla Tiburόn was granted by the Secretaría de Medio Ambiente y Recursos Naturales and the Cumcaác (Seri) Indian Tribe. Prescott College Research Station, Bahia Kino, generously provided logistical support during field studies. We are especially grateful to our Cumcaác guide, Ernesto Molina. S. Dobner, M. Bachman, R. Houston, J. Wise, N. Marks, and L. Perg assisted with field studies. Discussions with G. Axen, E. Nagy, and C. Lewis and reviews by J. Vallance and J. Ruiz contributed to the development of this paper. California Institute of Technology, Division of Geological and Planetary Sciences Contribution 8712.
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Subject Keywords:Gulf of California, Mexico, rifting, plate motion, ignimbrite, correlation.
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Caltech Division of Geological and Planetary Sciences8712
Issue or Number:5
Record Number:CaltechAUTHORS:20140415-110426833
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Official Citation: Michael Oskin, Joann Stock, and Arturo Martín-Barajas Rapid localization of Pacific–North America plate motion in the Gulf of California Geology, , v. 29, p. 459-462, doi:10.1130/0091-7613(2001)029<0459:RLOPNA>2.0.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44953
Deposited By: Ruth Sustaita
Deposited On:15 Apr 2014 18:31
Last Modified:10 Nov 2021 16:58

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