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

Research Article| January 01, 2003 Marine incursion synchronous with plate-boundary localization in the Gulf of California Michael Oskin; Michael Oskin 1Institute for Crustal Studies, University of California, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar Joann Stock Joann Stock 2California Institute of Technology, Pasadena, California 91125, USA Search for other works by this author on: GSW Google Scholar Geology (2003) 31 (1): 23–26. https://doi.org/10.1130/0091-7613(2003)031<0023:MISWPB>2.0.CO;2 Article history received: 09 Jul 2002 rev-recd: 19 Sep 2002 accepted: 22 Sep 2002 first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Michael Oskin, Joann Stock; Marine incursion synchronous with plate-boundary localization in the Gulf of California. Geology 2003;; 31 (1): 23–26. doi: https://doi.org/10.1130/0091-7613(2003)031<0023:MISWPB>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract 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. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.