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Artículo

The origin of the San Jorge Gulf Basin in the context of the Mesozoic-Cenozoic evolution of Patagonia

Folguera Telichevsky, AndresIcon ; Fernández Paz, LucíaIcon ; Iannelli, SofíaIcon ; Navarrete Granzotto, César RodrigoIcon ; Echaurren Gonzalez, AndresIcon ; Gianni, Guido MartinIcon ; Butler, Kristina L.; Horton, Brian K.; Litvak, Vanesa DafneIcon ; Encinas, Alfonso; Orts, Darío LeandroIcon
Fecha de publicación: 01/2020
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

The retroarc region of central Patagonia recorded three contractional stages (Late Triassic, Late Cretaceous, and Miocene) coincident with eastward broadening of arc magmatism. Inboard arc migration may be linked to shallowing of the subducted slab, subduction erosion of forearc regions, or a combination of both. Contractional episodes were followed by slab rollback, producing a series of extensional depocenters and magmatic belts across Patagonia at ~170-130 Ma, ~55-22 Ma and ~5 Ma. These rollback events weakened Patagonian crust through fracturing, mantle upwelling, and magmatic injection, favoring inception and propagation of subsequent contractional episodes. Phases of slab rollback and retroarc extension are reflected in εHf and εNd isotopic trends, with more juvenile trajectories corresponding to mantle upwelling into a broad asthenospheric wedge during slab retreat. Periods of crustal shortening are recorded by evolved εHf and εNd isotopic trajectories, demonstrating modified mantle sources. Mesozoic-Cenozoic extensional basins of Patagonia, such as the Chubut Basin, Cañadón Asfalto Basin, Río Mayo-Aysén Basin, Pilcaniyeu and Auca Pan-El Maitén magmatic belts/volcanogenic basins, and the Traiguén Basin were generated during episodes of slab rollback. In contrast, the extension-related San Jorge Gulf Basin constitutes an east-west-trending anomaly developed in an interval of the Cretaceous when the rest of western Patagonia experienced shortening. During this time, crustal evolution trends shifted from juvenile to more evolved and the arc expanded toward the continental interior most likely under a flat-slab regime. The San Jorge Gulf Basin is linked to Neocomian extensional structures in an intracratonic basin later influenced by compressional stresses linked to subduction zone in the west and incipient opening of the south Atlantic to east.
Palabras clave: FLARE-UPS , FLAT SUBDUCTION ZONE , MAGMATIC SHIFTING , PATAGONIA , ROLLBACK , SAN JORGE GULF BASIN , SYNOROGENIC RIFTING
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/118473
URL: https://linkinghub.elsevier.com/retrieve/pii/S0895981119304316
DOI: http://dx.doi.org/10.1016/j.jsames.2019.102422
Colecciones
Articulos(IDEAN)
Articulos de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Articulos(IIPG)
Articulos de INSTITUTO DE INVESTIGACION EN PALEOBIOLOGIA Y GEOLOGIA
Citación
Folguera Telichevsky, Andres; Fernández Paz, Lucía; Iannelli, Sofía; Navarrete Granzotto, César Rodrigo; Echaurren Gonzalez, Andres; et al.; The origin of the San Jorge Gulf Basin in the context of the Mesozoic-Cenozoic evolution of Patagonia; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 97; 102422; 1-2020; 1-13
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