Pacific–North America plate motion and opening of the Upper Delfín basin, northern Gulf of California, Mexico
2003; Geological Society of America; Volume: 115; Issue: 10 Linguagem: Inglês
10.1130/b25154.1
ISSN1943-2674
Autores Tópico(s)Geology and Paleoclimatology Research
ResumoResearch Article| October 01, 2003 Pacific–North America plate motion and opening of the Upper Delfín basin, northern Gulf of California, Mexico Michael Oskin; Michael Oskin 1Institute for Crustal Studies, University of California, Santa Barbara, California 93106-1100, 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 Author and Article Information Michael Oskin 1Institute for Crustal Studies, University of California, Santa Barbara, California 93106-1100, USA Joann Stock 2California Institute of Technology, Pasadena, California 91125, USA Publisher: Geological Society of America Received: 18 Mar 2002 Revision Received: 26 Dec 2002 Accepted: 17 Feb 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2003) 115 (10): 1173–1190. https://doi.org/10.1130/B25154.1 Article history Received: 18 Mar 2002 Revision Received: 26 Dec 2002 Accepted: 17 Feb 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Michael Oskin, Joann Stock; Pacific–North America plate motion and opening of the Upper Delfín basin, northern Gulf of California, Mexico. GSA Bulletin 2003;; 115 (10): 1173–1190. doi: https://doi.org/10.1130/B25154.1 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 SocietyGSA Bulletin Search Advanced Search Abstract Correlation of conjugate rifted margins of the Upper Delfín basin constrains the timing and amount of transtensional opening along the Pacific–North America plate boundary in the northern Gulf of California. Lithologic, geochemical, paleomagnetic, and geochronologic data from a set of four ignimbrites, consisting of eight distinctive cooling units, are shown to correlate from northeastern Baja California to Isla Tiburón and adjacent areas of western Sonora. These matching ignimbrites are the ca. 12.6 Ma tuff of San Felipe, the 6.3 ± 0.2 Ma tuffs of Mesa Cuadrada (Tmr3 and Tmr4), the tuffs of Dead Battery Canyon (Tmr5), and the 6.1 ± 0.5 Ma tuffs of Arroyo El Canelo. Offset distributions and facies patterns of these ignimbrites support 255 ± 10 km of opening between conjugate rifted margins of the Upper Delfín basin. Addition of deformation from the continental margins of this basin indicates at least 276 ± 13 km of Pacific–North America plate motion between coastal Sonora and the main gulf escarpment in Baja California since ca. 6 Ma; a further 20 ± 10 km of northwestward displacement of Isla Tiburón relative to coastal Sonora occurred sometime after 12.6 Ma. These reconstructions agree with earlier estimates of slip across the Gulf of California and on the San Andreas fault system of southern California, but require that the Pacific–North America plate boundary became localized in the gulf at ca. 6 Ma. The restored continental margins of the Upper Delfín basin show that only a 20–25 km width of upper continental crust has foundered beneath this part of the northern Gulf of California. This result suggests that most of the crustal area formed by opening of the Upper Delfín basin was either exhumed from lower-crustal levels or is new transitional oceanic crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Referência(s)