Variation of Cenozoic extension and volcanism across the southern Sierra Madre Occidental volcanic province, Mexico

Research Article| March 01, 1999 Variation of Cenozoic extension and volcanism across the southern Sierra Madre Occidental volcanic province, Mexico Ángel F. Nieto-Samaniego; Ángel F. Nieto-Samaniego 1Unidad de Ciencias de la Tierra, Universidad Nacional Autónoma de México, Campus Juriquilla, Apdo. Postal 1-742, Querétaro, Qro., 76001, México Search for other works by this author on: GSW Google Scholar Luca Ferrari; Luca Ferrari 1Unidad de Ciencias de la Tierra, Universidad Nacional Autónoma de México, Campus Juriquilla, Apdo. Postal 1-742, Querétaro, Qro., 76001, México Search for other works by this author on: GSW Google Scholar Susana A. Alaniz-Alvarez; Susana A. Alaniz-Alvarez 1Unidad de Ciencias de la Tierra, Universidad Nacional Autónoma de México, Campus Juriquilla, Apdo. Postal 1-742, Querétaro, Qro., 76001, México Search for other works by this author on: GSW Google Scholar Guillermo Labarthe-Hernández; Guillermo Labarthe-Hernández 2Instituto de Geología, Universidad Autónoma de San Luis Potosí, Dr. Manuel Nava 5, Zona Universitaria, San Luis Potosí, S. L. P., 78240, México Search for other works by this author on: GSW Google Scholar José Rosas-Elguera José Rosas-Elguera 3Centro de Ciencias de la Tierra, Universidad de Guadalajara, Blvd. M. García Barragán y Calz. Olímpica, 44840, Guadalajara, Jalisco, México Search for other works by this author on: GSW Google Scholar GSA Bulletin (1999) 111 (3): 347–363. https://doi.org/10.1130/0016-7606(1999)111<0347:VOCEAV>2.3.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 Ángel F. Nieto-Samaniego, Luca Ferrari, Susana A. Alaniz-Alvarez, Guillermo Labarthe-Hernández, José Rosas-Elguera; Variation of Cenozoic extension and volcanism across the southern Sierra Madre Occidental volcanic province, Mexico. GSA Bulletin 1999;; 111 (3): 347–363. doi: https://doi.org/10.1130/0016-7606(1999)111<0347:VOCEAV>2.3.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 The middle to late Cenozoic tectonic-magmatic evolution of the Sierra Madre Occidental volcanic province south of the Tropic of Cancer is summarized and analyzed for the first time, based on new geologic and structural work and published information. In the eastern part of the study region (Mesa central physiographic province) silicic volcanism occurred in a short-lived episode culminating at ca. 30 Ma and was followed by crustal-scale extension between 30 and 27 Ma. In the western part of the study area (Sierra Madre Occidental physiographic province) a voluminous episode of ignimbrite volcanism at 24–21 Ma was succeeded by east-west extension that produced regularly spaced grabens affecting only the upper crust. In the westernmost part of the study region, an andesitic to rhyolitic arc, formed between 17 and 12 Ma, was affected by crustal-scale, north-northwest–trending, extensional faulting, leading to the formation of the Gulf of California. In the Mesa central the maximum extension was oriented approximately east-west and amounted to ∼20%. In the eastern Sierra Madre Occidental physiographic province extension was only 8% and oriented approximately east-west. We observe that trenchward shifting of the climax of subduction volcanism and extension occurred during late Oligocene, early Miocene, and late Miocene time. Comparison with the offshore tectonics indicates that the first two tectonic-magmatic pulses coincide with periods of fast spreading at the Pacific-Farallon boundary, south of the Shirley fracture zone. We propose that increases in the spreading rate are related to periods of high subduction rate, which in turn correspond to episodes of retreating subduction. A retreating slab may have generated a flux of hotter asthenospheric material into the mantle wedge, producing widespread melting at the base of the crust as well as intraarc extension in the overriding plate. Boundary conditions (i.e., plate tectonics) ultimately determined timing, magnitude, and orientation of extension, whereas volcanic and tectonic styles are controlled by the internal structure of crustal blocks and by the gravitational and thermal effects of magmatism. This content is PDF only. Please click on the PDF icon to access. 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.