Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif

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The origin of Patagonia and its relations with the South American crustal blocks to the north have been a matter of debate for decades. We report results from a multidisciplinary study centered on Paleozoic granitoids exposed in the northeastern corner of the North Patagonian Massif. Microstructural...

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Autores principales: Rapalini, Augusto Ernesto, Martinez Dopico, Carmen Irene
Publicado: 2010
Materias:
Collision
Gondwana
Late paleozoic
Magmatism
Patagonia
collision zone
deformation
emplacement
geobarometry
granitoid
magmatism
magnetic fabric
microstructure
Paleozoic
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v8_n4_p349_Rapalini
http://hdl.handle.net/20.500.12110/paper_16956133_v8_n4_p349_Rapalini
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_16956133_v8_n4_p349_Rapalini
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spelling paper:paper_16956133_v8_n4_p349_Rapalini2023-06-08T16:26:49Z Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif Rapalini, Augusto Ernesto Martinez Dopico, Carmen Irene Collision Gondwana Late paleozoic Magmatism Patagonia collision zone deformation emplacement geobarometry Gondwana granitoid magmatism magnetic fabric microstructure Paleozoic Patagonia The origin of Patagonia and its relations with the South American crustal blocks to the north have been a matter of debate for decades. We report results from a multidisciplinary study centered on Paleozoic granitoids exposed in the northeastern corner of the North Patagonian Massif. Microstructural and magnetofabric studies reveal two suites of granitoids. Late Carboniferous (?) granitoids (Yaminué Complex, Tardugno Granodiorite, Cabeza de Vaca leucogranite) were emplaced and subsequently deformed in a major NNE-SSW compressive stress regime that also provoked top-to-the-SW thrust deformation in shallow crustal levels. Gravity and geobarometric studies show that the same major deformation event has been recorded at different crustal levels. The age and type of deformation of this event recorded across the northern boundary of Patagonia strongly supports a Late Carboniferous - Early Permian frontal collision between Patagonia and Gondwana. This major deformation event ceased by 281 Ma when the Navarrete Plutonic Complex, which shows mainly magmatic fabrics, was emplaced under a far-field WNW-ESE stress regime. Crustal continuity between the North Patagonian Massif and the Pampia and Arequipa- Antofalla terranes is suggested by similar Late Paleoproterozoic crustal model ages, comparable detrital zircon ages in Early Paleozoic successions, the apparent continuity of an Early Ordovician continental magmatic arc and paleomagnetic data. Reconciliation of this evidence with the Late Paleozoic frontal collision is obtained in a tectonic model that suggests that the North Patagonian Massif is a parautochthonous crustal block. Fil:Rapalini, A.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Martínez Dopico, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2010 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v8_n4_p349_Rapalini http://hdl.handle.net/20.500.12110/paper_16956133_v8_n4_p349_Rapalini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Collision
Gondwana
Late paleozoic
Magmatism
Patagonia
collision zone
deformation
emplacement
geobarometry
Gondwana
granitoid
magmatism
magnetic fabric
microstructure
Paleozoic
Patagonia
spellingShingle Collision
Gondwana
Late paleozoic
Magmatism
Patagonia
collision zone
deformation
emplacement
geobarometry
Gondwana
granitoid
magmatism
magnetic fabric
microstructure
Paleozoic
Patagonia
Rapalini, Augusto Ernesto
Martinez Dopico, Carmen Irene
Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif
topic_facet Collision
Gondwana
Late paleozoic
Magmatism
Patagonia
collision zone
deformation
emplacement
geobarometry
Gondwana
granitoid
magmatism
magnetic fabric
microstructure
Paleozoic
Patagonia
description The origin of Patagonia and its relations with the South American crustal blocks to the north have been a matter of debate for decades. We report results from a multidisciplinary study centered on Paleozoic granitoids exposed in the northeastern corner of the North Patagonian Massif. Microstructural and magnetofabric studies reveal two suites of granitoids. Late Carboniferous (?) granitoids (Yaminué Complex, Tardugno Granodiorite, Cabeza de Vaca leucogranite) were emplaced and subsequently deformed in a major NNE-SSW compressive stress regime that also provoked top-to-the-SW thrust deformation in shallow crustal levels. Gravity and geobarometric studies show that the same major deformation event has been recorded at different crustal levels. The age and type of deformation of this event recorded across the northern boundary of Patagonia strongly supports a Late Carboniferous - Early Permian frontal collision between Patagonia and Gondwana. This major deformation event ceased by 281 Ma when the Navarrete Plutonic Complex, which shows mainly magmatic fabrics, was emplaced under a far-field WNW-ESE stress regime. Crustal continuity between the North Patagonian Massif and the Pampia and Arequipa- Antofalla terranes is suggested by similar Late Paleoproterozoic crustal model ages, comparable detrital zircon ages in Early Paleozoic successions, the apparent continuity of an Early Ordovician continental magmatic arc and paleomagnetic data. Reconciliation of this evidence with the Late Paleozoic frontal collision is obtained in a tectonic model that suggests that the North Patagonian Massif is a parautochthonous crustal block.
author Rapalini, Augusto Ernesto
Martinez Dopico, Carmen Irene
author_facet Rapalini, Augusto Ernesto
Martinez Dopico, Carmen Irene
author_sort Rapalini, Augusto Ernesto
title Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif
title_short Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif
title_full Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif
title_fullStr Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif
title_full_unstemmed Did Patagonia collide with Gondwana in the late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif
title_sort did patagonia collide with gondwana in the late paleozoic? some insights from a multidisciplinary study of magmatic units of the north patagonian massif
publishDate 2010
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v8_n4_p349_Rapalini
http://hdl.handle.net/20.500.12110/paper_16956133_v8_n4_p349_Rapalini
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