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Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlan Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans

2007; Geological Society of America; Volume: 119; Issue: 9-10 Linguagem: Inglês

10.1130/b226031.1

1943-2674

Ricardo Vega‐Granillo, Óscar Talavera-Mendoza, Diana Meza‐Figueroa, J. Ruíz, G. E. Gehrels, Margarita López‐Martínez, J. C. de la Cruz-Vargas,

Geological and Tectonic Studies in Latin America

Research Article| September 01, 2007 Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlán Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans Ricardo Vega-Granillo; Ricardo Vega-Granillo 1Departamento de Geología, Universidad de Sonora, Rosales y Encinas S/N, Hermosillo, Sonora, México 83000 Search for other works by this author on: GSW Google Scholar Oscar Talavera-Mendoza; Oscar Talavera-Mendoza 2Unidad Académica de Ciencias de la Tierra, Universidad Autónoma de Guerrero, A.P. 197, Taxco, Guerrero, México 40200 Search for other works by this author on: GSW Google Scholar Diana Meza-Figueroa; Diana Meza-Figueroa 3Departamento de Geología, Universidad de Sonora, Rosales y Encinas S/N, Hermosillo, Sonora, México 83000 Search for other works by this author on: GSW Google Scholar Joaquin Ruiz; Joaquin Ruiz 4Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar George E. Gehrels; George E. Gehrels 4Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Margarita López-Martínez; Margarita López-Martínez 5Departamento de Geología, CICESE, Km 107 Carr, Tijuana–Ensenada, Ensenada, Baja California, México Search for other works by this author on: GSW Google Scholar Julio C. de la Cruz-Vargas Julio C. de la Cruz-Vargas 6Departamento de Geología, Universidad de Sonora, Rosales y Encinas S/N, Hermosillo, Sonora, México 83000 Search for other works by this author on: GSW Google Scholar Author and Article Information Ricardo Vega-Granillo 1Departamento de Geología, Universidad de Sonora, Rosales y Encinas S/N, Hermosillo, Sonora, México 83000 Oscar Talavera-Mendoza 2Unidad Académica de Ciencias de la Tierra, Universidad Autónoma de Guerrero, A.P. 197, Taxco, Guerrero, México 40200 Diana Meza-Figueroa 3Departamento de Geología, Universidad de Sonora, Rosales y Encinas S/N, Hermosillo, Sonora, México 83000 Joaquin Ruiz 4Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA George E. Gehrels 4Department of Geosciences, University of Arizona, Tucson, Arizona 85721, USA Margarita López-Martínez 5Departamento de Geología, CICESE, Km 107 Carr, Tijuana–Ensenada, Ensenada, Baja California, México Julio C. de la Cruz-Vargas 6Departamento de Geología, Universidad de Sonora, Rosales y Encinas S/N, Hermosillo, Sonora, México 83000 Publisher: Geological Society of America Received: 29 Aug 2006 Revision Received: 12 Apr 2007 Accepted: 01 May 2007 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2007) 119 (9-10): 1249–1264. https://doi.org/10.1130/B226031.1 Article history Received: 29 Aug 2006 Revision Received: 12 Apr 2007 Accepted: 01 May 2007 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Ricardo Vega-Granillo, Oscar Talavera-Mendoza, Diana Meza-Figueroa, Joaquin Ruiz, George E. Gehrels, Margarita López-Martínez, Julio C. de la Cruz-Vargas; Pressure-temperature-time evolution of Paleozoic high-pressure rocks of the Acatlán Complex (southern Mexico): Implications for the evolution of the Iapetus and Rheic Oceans. GSA Bulletin 2007;; 119 (9-10): 1249–1264. doi: https://doi.org/10.1130/B226031.1 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 New thermobarometric and U/Pb and 40Ar/39Ar geochronologic data coupled with ages obtained from the Acatlán Complex, the basement of the Mixteco terrane of southern Mexico, reveal the existence of three distinctive high-pressure metamorphic events of early to middle Paleozoic age, each recorded in a separate lithological suite. Xayacatlán suite eclogites with oceanic affinity underwent peak metamorphism at 609–491 °C and 13–12 kb during the Early Ordovician (ca. 490–477 Ma, U-Pb zircon), followed by a partial overprint at 600 °C and ∼9.6 kb and then at 500 °C and ∼6.7 kb. An overprinting event at 525–500 °C and ∼9.5 kb is ascribed to the Devonian. The pressure-temperature (P-T) path of the Xayacatlán suite indicates a subduction-exhumation process followed by tectonically related reburial. Ixcamilpa suite blueschists with oceanic affinity underwent epidote-blueschist metamorphism (T, 200–390 °C; P, 6–9 kb) and then epidote-amphibolite (T, 390–580 °C; P, 9–6 kb) events ascribed to the Late Ordovician–Early Silurian. Esperanza suite eclogites with continental affinity underwent peak metamorphism at 830–730 °C and 17–15 kb. Amphibole from eclogite yields a 430 ± 5 Ma 40Ar/39Ar age, dating the high-pressure (HP) event. P-T paths of high-temperature (HT) eclogites like those of the Esperanza suite have been related to the collision of continental blocks. Partial overprinting occurred at 690–640 °C and 14–10 kb prior to 374 ± 2 Ma (40Ar/39Ar, phengite). The three HP suites were tectonically juxtaposed at different times before the Mississippian Period, resulting in the closure of the Iapetus Ocean. Phengite 40Ar/39Ar geochronology reveals the existence of a widespread tectonothermal event between 345 and 323 Ma, which may be related to the juxtaposition of the HP-composed block and the Gondwanan-affinity Cosoltepec suite, causing the closure of the Rheic Ocean. The tectonothermal events in the Acatlán Complex coincide in time, physical conditions, and tectonic setting with events in the Appalachian-Caledonian orogen, suggesting their relation. On that basis the geology of the Acatlán Complex can lead to a more comprehensive understanding of the tectonic evolution of the Appalachian orogen and of the Gondwana-Laurentia interactions preceding the Pangean assembly. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.