The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia

Extensive fieldwork carried out in the inner sectors of the Cordillera Patagónica has revealed evidence of alternate of periods of crustal extension and orogen formation since the Jurassic. The Patagonian lithosphere was extended during the Mesozoic and fractured and collapsed into numerous depocent...

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Autores principales: Folguera, A., Iannizzotto, N.F.
Formato: JOUR
Materias:
Mountain building
Patagonian andes
Southern gondwana evolution
Tectonic inversion
fold and thrust belt
Gondwana
orogenic belt
suture zone
tectonic evolution
volcanism
Patagonia
South America
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v16_n7_p541_Folguera
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_08959811_v16_n7_p541_Folguera
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spelling todo:paper_08959811_v16_n7_p541_Folguera2023-10-03T15:42:36Z The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia Folguera, A. Iannizzotto, N.F. Mountain building Patagonian andes Southern gondwana evolution Tectonic inversion fold and thrust belt Gondwana orogenic belt suture zone tectonic evolution volcanism Patagonia South America Extensive fieldwork carried out in the inner sectors of the Cordillera Patagónica has revealed evidence of alternate of periods of crustal extension and orogen formation since the Jurassic. The Patagonian lithosphere was extended during the Mesozoic and fractured and collapsed into numerous depocenters within the arc and retroarc. The last pulse of extension during this period occurred in the Early Cretaceous, related to a series of Pacific transgressions that formed the embayment of the Ŕo Mayo basin, north of the Austral basin. The Río Mayo basin is part of a widespread Early Cretaceous synrift episode found throughout the Patagonian region between 155 and 140 Ma. The last part of this rifting episode, between 140 and 125 Ma, was spatially more limited, restricted to the arc and inner retroarc. The area of extension can be related to an early Paleozoic suture between the Somuncura Massif and the hanging wall of the Deseado Massif. The correct identification of this suture zone helps delimit distinctive volcanic provinces, as well as metallogenic ore districts. Thermal subsidence ceased as a consequence of a sudden tectonic inversion related to a major lithospheric reorganization at 120 Ma, during the breakup of southern Gondwana. The closure of the small Ŕo Mayo intra-arc-retroarc basin occurred as a result of a fold-and-thrust belt, mainly by tectonic inversion of previous normal faults, and was partially related to thin-skinned deformation. The emplacement of the Eastern Patagonian batholith between 100 and 80 Ma destroyed the inner sectors of the fold-and-thrust belt. During this time, the collapse of the inner sectors allowed for the development of a second, more limited intra-arc basin. The orogenic wedge grew through the inversion of progressively deeper decollements and out-of-sequence thrusts and lasted until the Late Paleogene, with a period of probable quiescence during the highly oblique subduction of the Aluk (Phoenix) Plate in the early Paleogene. © 2003 Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v16_n7_p541_Folguera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Mountain building
Patagonian andes
Southern gondwana evolution
Tectonic inversion
fold and thrust belt
Gondwana
orogenic belt
suture zone
tectonic evolution
volcanism
Patagonia
South America
spellingShingle Mountain building
Patagonian andes
Southern gondwana evolution
Tectonic inversion
fold and thrust belt
Gondwana
orogenic belt
suture zone
tectonic evolution
volcanism
Patagonia
South America
Folguera, A.
Iannizzotto, N.F.
The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia
topic_facet Mountain building
Patagonian andes
Southern gondwana evolution
Tectonic inversion
fold and thrust belt
Gondwana
orogenic belt
suture zone
tectonic evolution
volcanism
Patagonia
South America
description Extensive fieldwork carried out in the inner sectors of the Cordillera Patagónica has revealed evidence of alternate of periods of crustal extension and orogen formation since the Jurassic. The Patagonian lithosphere was extended during the Mesozoic and fractured and collapsed into numerous depocenters within the arc and retroarc. The last pulse of extension during this period occurred in the Early Cretaceous, related to a series of Pacific transgressions that formed the embayment of the Ŕo Mayo basin, north of the Austral basin. The Río Mayo basin is part of a widespread Early Cretaceous synrift episode found throughout the Patagonian region between 155 and 140 Ma. The last part of this rifting episode, between 140 and 125 Ma, was spatially more limited, restricted to the arc and inner retroarc. The area of extension can be related to an early Paleozoic suture between the Somuncura Massif and the hanging wall of the Deseado Massif. The correct identification of this suture zone helps delimit distinctive volcanic provinces, as well as metallogenic ore districts. Thermal subsidence ceased as a consequence of a sudden tectonic inversion related to a major lithospheric reorganization at 120 Ma, during the breakup of southern Gondwana. The closure of the small Ŕo Mayo intra-arc-retroarc basin occurred as a result of a fold-and-thrust belt, mainly by tectonic inversion of previous normal faults, and was partially related to thin-skinned deformation. The emplacement of the Eastern Patagonian batholith between 100 and 80 Ma destroyed the inner sectors of the fold-and-thrust belt. During this time, the collapse of the inner sectors allowed for the development of a second, more limited intra-arc basin. The orogenic wedge grew through the inversion of progressively deeper decollements and out-of-sequence thrusts and lasted until the Late Paleogene, with a period of probable quiescence during the highly oblique subduction of the Aluk (Phoenix) Plate in the early Paleogene. © 2003 Elsevier Ltd. All rights reserved.
format JOUR
author Folguera, A.
Iannizzotto, N.F.
author_facet Folguera, A.
Iannizzotto, N.F.
author_sort Folguera, A.
title The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia
title_short The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia
title_full The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia
title_fullStr The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia
title_full_unstemmed The lagos La Plata and Fontana fold-and-thrust belt: Long-lived orogenesis at the edge of western Patagonia
title_sort lagos la plata and fontana fold-and-thrust belt: long-lived orogenesis at the edge of western patagonia
url http://hdl.handle.net/20.500.12110/paper_08959811_v16_n7_p541_Folguera
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