Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions?
The Jurassic history of southern South America shows a complex geologic evolution which is the result of different processes that began along the western Gondwana margin during the initial stages of Pangea breakup. Andean subduction along the Pacific continental margin began in the Early Jurassic, a...
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ftunibueairesbd:paper:paper_00044822_v63_n4_p481_Mpodozis 2023-05-15T18:26:01+02:00 Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? Ramos, Victor Alberto 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p481_Mpodozis https://hdl.handle.net/20.500.12110/paper_00044822_v63_n4_p481_Mpodozis unknown https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p481_Mpodozis http://hdl.handle.net/20.500.12110/paper_00044822_v63_n4_p481_Mpodozis Andes Patagonia Rifting Subduction Weddell Sea backarc basin collision zone continental breakup continental margin extensional tectonics formation mechanism hot spot Jurassic large igneous province spreading center subduction zone tectonic evolution tectonic setting trend analysis uplift Argentina Chile South America Southern Ocean 2008 ftunibueairesbd https://doi.org/20.500.12110/paper_00044822_v63_n4_p481_Mpodozis 2023-02-16T02:13:27Z The Jurassic history of southern South America shows a complex geologic evolution which is the result of different processes that began along the western Gondwana margin during the initial stages of Pangea breakup. Andean subduction along the Pacific continental margin began in the Early Jurassic, after a period of continental-scale extension and rifting, which peaked by the end of the Triassic in central and northern Argentina and Chile. Renewal of subduction was the result of an episode of ocean growth along a series of spreading centers between North and South America when the separation of these continents began as a consequence of the activity of the Central Atlantic Magmatic Province hotspot. Motion along these spreading centers produced a component of oblique, SE-directed subduction along the western margin of South America and the reactivation of inherited orthogonal structural features as the N70°E trending Huincul ridge in the Neuquén Basin that was uplifted during Jurassic times. Subduction along the north-south trending Argentine-Chilean continental margin acelerated during the break-up between West and East Gondwana soon after the opening of the Indian Ocean, linked to the Karoo hot-spot. Subduction took place under extensional conditions probably associated with a negative trench roll-back, leading to the formation of a magmatic arc along the Coast Ranges from southern Peru to central Chile and, to the east, the Arequipa, Tarapacá and Neuquén extensional back-arc basins. In northern Patagonia, early Jurassic arc related magmatism occurred to the east of the present day Andean Cordillera along the short-lived (190-170 Ma) Subcordilleran Batholith and the associated Liassic intra arc basin. Arc magmatism ceased in northern Patagonia at ca 170 Ma to be replaced by huge volumes of Early to Middle Jurassic rhyolites and dacites of the Chon-Aike Large Igneous province produced as a result of crustal melting in an overheated crust during the initial stages of Gondwana breakup. Early rifting during ... Other/Unknown Material Southern Ocean Weddell Sea Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) Argentina Argentine Indian Pacific Patagonia Southern Ocean Weddell Weddell Sea |
institution |
Open Polar |
collection |
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires) |
op_collection_id |
ftunibueairesbd |
language |
unknown |
topic |
Andes Patagonia Rifting Subduction Weddell Sea backarc basin collision zone continental breakup continental margin extensional tectonics formation mechanism hot spot Jurassic large igneous province spreading center subduction zone tectonic evolution tectonic setting trend analysis uplift Argentina Chile South America Southern Ocean |
spellingShingle |
Andes Patagonia Rifting Subduction Weddell Sea backarc basin collision zone continental breakup continental margin extensional tectonics formation mechanism hot spot Jurassic large igneous province spreading center subduction zone tectonic evolution tectonic setting trend analysis uplift Argentina Chile South America Southern Ocean Ramos, Victor Alberto Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? |
topic_facet |
Andes Patagonia Rifting Subduction Weddell Sea backarc basin collision zone continental breakup continental margin extensional tectonics formation mechanism hot spot Jurassic large igneous province spreading center subduction zone tectonic evolution tectonic setting trend analysis uplift Argentina Chile South America Southern Ocean |
description |
The Jurassic history of southern South America shows a complex geologic evolution which is the result of different processes that began along the western Gondwana margin during the initial stages of Pangea breakup. Andean subduction along the Pacific continental margin began in the Early Jurassic, after a period of continental-scale extension and rifting, which peaked by the end of the Triassic in central and northern Argentina and Chile. Renewal of subduction was the result of an episode of ocean growth along a series of spreading centers between North and South America when the separation of these continents began as a consequence of the activity of the Central Atlantic Magmatic Province hotspot. Motion along these spreading centers produced a component of oblique, SE-directed subduction along the western margin of South America and the reactivation of inherited orthogonal structural features as the N70°E trending Huincul ridge in the Neuquén Basin that was uplifted during Jurassic times. Subduction along the north-south trending Argentine-Chilean continental margin acelerated during the break-up between West and East Gondwana soon after the opening of the Indian Ocean, linked to the Karoo hot-spot. Subduction took place under extensional conditions probably associated with a negative trench roll-back, leading to the formation of a magmatic arc along the Coast Ranges from southern Peru to central Chile and, to the east, the Arequipa, Tarapacá and Neuquén extensional back-arc basins. In northern Patagonia, early Jurassic arc related magmatism occurred to the east of the present day Andean Cordillera along the short-lived (190-170 Ma) Subcordilleran Batholith and the associated Liassic intra arc basin. Arc magmatism ceased in northern Patagonia at ca 170 Ma to be replaced by huge volumes of Early to Middle Jurassic rhyolites and dacites of the Chon-Aike Large Igneous province produced as a result of crustal melting in an overheated crust during the initial stages of Gondwana breakup. Early rifting during ... |
author |
Ramos, Victor Alberto |
author_facet |
Ramos, Victor Alberto |
author_sort |
Ramos, Victor Alberto |
title |
Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? |
title_short |
Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? |
title_full |
Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? |
title_fullStr |
Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? |
title_full_unstemmed |
Jurassic tectonics in Argentina and Chile: Extension, oblique subduction, rifting, drift and collisions? |
title_sort |
jurassic tectonics in argentina and chile: extension, oblique subduction, rifting, drift and collisions? |
publishDate |
2008 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p481_Mpodozis https://hdl.handle.net/20.500.12110/paper_00044822_v63_n4_p481_Mpodozis |
geographic |
Argentina Argentine Indian Pacific Patagonia Southern Ocean Weddell Weddell Sea |
geographic_facet |
Argentina Argentine Indian Pacific Patagonia Southern Ocean Weddell Weddell Sea |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_relation |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p481_Mpodozis http://hdl.handle.net/20.500.12110/paper_00044822_v63_n4_p481_Mpodozis |
op_doi |
https://doi.org/20.500.12110/paper_00044822_v63_n4_p481_Mpodozis |
_version_ |
1766207795824164864 |