The Mesozoic La Mula Island, Coahuila, Mexico

Research Article| October 01, 1984 The Mesozoic La Mula Island, Coahuila, Mexico NORRIS W. JONES; NORRIS W. JONES 1Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin 54901 Search for other works by this author on: GSW Google Scholar JAMES W. McKEE; JAMES W. McKEE 1Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin 54901 Search for other works by this author on: GSW Google Scholar BENJAMIN MÁRQUEZ D; BENJAMIN MÁRQUEZ D 2Petróleos Mexicanos, Mexico D.F., Mexico Search for other works by this author on: GSW Google Scholar JORGE TOVAR; JORGE TOVAR 3Petróleos Mexicanos, Distrito Exploración de San Luis Potosí, Benigno Arriaga 601-B Depto. 4, Apdo. Postal 1549-B, 78250 San Luis Potosí, S.L.P., Mexico Search for other works by this author on: GSW Google Scholar LEON E. LONG; LEON E. LONG 4Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712 Search for other works by this author on: GSW Google Scholar THOMAS S. LAUDON THOMAS S. LAUDON 1Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin 54901 Search for other works by this author on: GSW Google Scholar Author and Article Information NORRIS W. JONES 1Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin 54901 JAMES W. McKEE 1Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin 54901 BENJAMIN MÁRQUEZ D 2Petróleos Mexicanos, Mexico D.F., Mexico JORGE TOVAR 3Petróleos Mexicanos, Distrito Exploración de San Luis Potosí, Benigno Arriaga 601-B Depto. 4, Apdo. Postal 1549-B, 78250 San Luis Potosí, S.L.P., Mexico LEON E. LONG 4Department of Geological Sciences, The University of Texas at Austin, Austin, Texas 78712 THOMAS S. LAUDON 1Department of Geology, University of Wisconsin-Oshkosh, Oshkosh, Wisconsin 54901 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1984) 95 (10): 1226–1241. https://doi.org/10.1130/0016-7606(1984)95<1226:TMLMIC>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation NORRIS W. JONES, JAMES W. McKEE, BENJAMIN MÁRQUEZ D, JORGE TOVAR, LEON E. LONG, THOMAS S. LAUDON; The Mesozoic La Mula Island, Coahuila, Mexico. GSA Bulletin 1984;; 95 (10): 1226–1241. doi: https://doi.org/10.1130/0016-7606(1984)95<1226:TMLMIC>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 SocietyGSA Bulletin Search Advanced Search Abstract Granitic rocks at Potrero de La Mula and Sierra del Fuste, Coahuila, Mexico, are the only known exposures of a Late Triassic pluton that, by the Late Jurassic, stood as a topographically high area until it was inundated by the Cretaceous sea. The principal igneous rock at Potrero de La Mula is a two-feldspar, biotite-hornblende, I-type granite that is cut by comagmatic dikes of six ages and by several shear zones. A Rb-Sr age of 213 ± 14 m.y. and an initial ratio of 0.705 ± .0004 were obtained from nine whole-rock samples. A shallow depth of emplacement is inferred from textural and mineralogical evidence. Mineralogy, chemistry, and isotopes suggest emplacement above a subduction zone, which is consistent with the hypothesis that a late Paleozoic-earliest Mesozoic convergent plate boundary existed in northern Mexico.After being unroofed, the pluton contributed sediment to the adjoining Sabinas Gulf until the mid-Neocomian. By the Hauterivian, the pluton supported, a deeply weathered terrain of moderate relief flanked on its northeastern side by lagoonal environments (Oballos Member, Padilla Formation). Farther south, uplift by faulting along the northern flank of the Coahuila Island produced a clastic wedge, the finer-grained paralic components of which (La Mula Formation) prograded northeastward and eventually covered La Mula Island. Subsequent deposits at Potrero de La Mula, beginning with gypsum, reflect gradually deepening water and include the La Virgen, Cupido, La Peña, and Tamaulipas Formations. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.