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Marine incursion synchronous with plate-boundary localization in the Gulf of California

Oskin, Michael and Stock, Joann (2003) Marine incursion synchronous with plate-boundary localization in the Gulf of California. Geology, 31 (1). pp. 23-26. ISSN 0091-7613. doi:10.1130/0091-7613(2003)031<0023:MISWPB>2.0.CO;2.

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Volcanic strata on southwest Isla Tiburón define the age of interstratified marine rocks and, through revision of existing correlations, the age of the proto–Gulf of California marine incursion. A 5.7 ± 0.2 Ma ash flow was emplaced at the base of the marine section. A rhyodacite dike and its related lava flow, dated as 11.2 ± 1.3 Ma, 3.7 ± 0.9 Ma, and 4.2 ± 1.8 Ma, intrudes and overlies, respectively, the marine rocks. The 11.2 Ma age, which was the core datum for a middle Miocene proto–Gulf of California origin for the underlying rocks, is discordant with all other isotopic and microfossil ages. An alternative interpretation, utilizing all available geologic and geochronologic data except this discordant age, is that marine strata on Isla Tiburón are latest Miocene to early Pliocene age. Reinterpretation of these strata supports a simplified history of marine incursion into the Gulf of California. Marine rocks as old as 8.2 Ma in the southern Gulf of California indicate an early marine incursion, perhaps flooding a region of more intense proto–Gulf of California continental extension. Flooding of the entire basin by 6.5–6.3 Ma correlates to the sudden onset of significant Pacific–North American plate-boundary motion within the Gulf of California.

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URLURL TypeDescription<0023:MISWPB>2.0.CO;2 DOIArticle
Oskin, Michael0000-0002-6631-5326
Stock, Joann0000-0003-4816-7865
Additional Information:© 2003 Geological Society of America. Received 9 July 2002; Revision received 19 September 2002; Accepted 22 September 2002. Supported by National Science Foundation grants EAR-9614674 and EAR-0001248 and a grant from the University of California MEXUS program. We also appreciate the support of C. González-León of the Universidad Nacional Autónoma de México. Permission to enter Isla Tiburón was granted by the Secretaría de Medio Ambiente y Recursos Naturales and the Cumcaác (Seri) Indian Tribe. E. Molina, C. Lewis, A. Martín-Barajas, S. Dobner, R. Houston, J. Wise, and L. Perg assisted with field studies. Discussions with J.T. Smith and A. Carreño and reviews by W. Normark and J. Helenes contributed to the development of this paper. California Institute of Technology, Division of Geological and Planetary Sciences contribution 8890.
Group:Seismological Laboratory
Funding AgencyGrant Number
University of California MEXUS programUNSPECIFIED
Subject Keywords:Gulf of California; Salton Trough; Mexico; marine sediments; rifting
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Caltech Division of Geological and Planetary Sciences8890
Issue or Number:1
Record Number:CaltechAUTHORS:20140416-103726426
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Official Citation:Oskin, M., & Stock, J. (2003). Marine incursion synchronous with plate-boundary localization in the Gulf of California. Geology, 31(1), 23-26. doi: 10.1130/0091-7613(2003)031<0023:miswpb>;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44977
Deposited On:16 Apr 2014 22:58
Last Modified:10 Nov 2021 16:58

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