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Late Paleozoic to Triassic evolution of the Gondwana margin: Evidence from Chilean Frontal Cordilleran batholiths (28°S to 31°S)

1992; Geological Society of America; Volume: 104; Issue: 8 Linguagem: Inglês

10.1130/0016-7606(1992)104 2.3.co;2

1943-2674

Constantino Mpodozis, Suzanne Mahlburg Kay,

Geological formations and processes

Research Article| August 01, 1992 Late Paleozoic to Triassic evolution of the Gondwana margin: Evidence from Chilean Frontal Cordilleran batholiths (28°S to 31°S) CONSTANTINO MPODOZIS; CONSTANTINO MPODOZIS 1Servicio Nacional de Geología y Minería, Avenida Santa Maria 0104, Santiago, Chile Search for other works by this author on: GSW Google Scholar SUZANNE MAHLBURG KAY SUZANNE MAHLBURG KAY 2INSTOC, Snee Hall, Cornell University, Ithaca, New York 14853 Search for other works by this author on: GSW Google Scholar Author and Article Information CONSTANTINO MPODOZIS 1Servicio Nacional de Geología y Minería, Avenida Santa Maria 0104, Santiago, Chile SUZANNE MAHLBURG KAY 2INSTOC, Snee Hall, Cornell University, Ithaca, New York 14853 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1992) 104 (8): 999–1014. https://doi.org/10.1130/0016-7606(1992)104 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 Email Permissions Search Site Citation CONSTANTINO MPODOZIS, SUZANNE MAHLBURG KAY; Late Paleozoic to Triassic evolution of the Gondwana margin: Evidence from Chilean Frontal Cordilleran batholiths (28°S to 31°S). GSA Bulletin 1992;; 104 (8): 999–1014. doi: https://doi.org/10.1130/0016-7606(1992)104 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 Upper Paleozoic to Triassic Chilean granitoids in the Andean Frontal Cordillera between 28°S and 31°S record crustal and mantle conditions at the Gondwana margin during the final assembly and initial breakup of the Pangea supercontinent. This period overlaps the end of Paleozoic terrane accretion and precedes Andean subduction. Integration of new trace-element and isotopic data with other information on the granitoids and the regional geology leads to a tectonic model that has implications for other parts of the Gondwana margin. In the model, the Carboniferous to Early Permian is a period of oblique convergence. Associated Elqui complex granitoids are diverse. Those in the Guanta and Montosa units are predominantly related to subduction processes, whereas those in the Cochiguás and El Volcán units are dominated by melting of the subduction complex and older crust. Progressive oblique collision of the last pre-Pangea terrane (Equis) along the margin resulted in crustal thickening associated with shortening deformation of foreland basinal sedimentary rocks and uplift of the Elqui complex. Subsequent gravitational collapse of the inactive slab and lithospheric delamination resulted in the production of large amounts of basalt, which intruded and melted the crust, producing the post-collisional Ingaguás complex. The Los Carricitos granitoids formed in thickened crust, whereas the Chollay, El Colorado, and El León units formed in thinner crust. The Ingaguás complex is part of the Choiyoi granite-rhyolite province, whose formation, similar to that of other Gondwana silicic provinces, was probably accentuated by anomalously hot upper mantle associated with the Pangea supercontinent. 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.