Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen

The Paleozoic pre-Carboniferous rocks of the San Rafael Block, located to the east of the Los Reyunos Gondwanan Thrust, show Chanic structures (Late Devonian–early Carboniferous) with east vergence, which were generated in the absence of metamorphism. This Paleozoic succession is unconformably locat...

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Autores principales: García-Sansegundo, Joaquín, Farias, Pedro, Rubio-Ordóñez, Álvaro, Clariana, Pilar, Cingolani, Carlos Alberto, Heredia, Nemesio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2023
Materias:
Geología
San Rafael Block
Andes
Paleozoic basement
Chanic deformation
Gondwanan deformation
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/160106
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-160106
record_format dspace
spelling I19-R120-10915-1601062023-11-14T20:08:19Z http://sedici.unlp.edu.ar/handle/10915/160106 Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen García-Sansegundo, Joaquín Farias, Pedro Rubio-Ordóñez, Álvaro Clariana, Pilar Cingolani, Carlos Alberto Heredia, Nemesio 2023 2023-11-14T11:58:54Z en Geología San Rafael Block Andes Paleozoic basement Chanic deformation Gondwanan deformation The Paleozoic pre-Carboniferous rocks of the San Rafael Block, located to the east of the Los Reyunos Gondwanan Thrust, show Chanic structures (Late Devonian–early Carboniferous) with east vergence, which were generated in the absence of metamorphism. This Paleozoic succession is unconformably located on the basement of Cuyania. The rocks, located to the west of the Los Reyunos Thrust, were deformed by two fold episodes, the first and main (D1) west verging, developed under low to very low-grade metamorphic conditions, and the second (D2) east verging and mainly developed near Los Reyunos Reservoir. Therefore, the Los Reyunos Thrust must be considered a reactivation of a Chanic structure during the Gondwanan Orogeny (late Carboniferous–early Permian). The ancient Chanic thrust could be responsible for the overlay of the hinterland of the western branch of the Chanic Orogen on the foreland of its eastern branch, at the end of the collision between the Cuyania and Chilenia subplates. The results of this work have been related to those of nearby areas located to the north and west, which has allowed the elaboration of a model that explains the characteristics of the Chanic Orogen in this area. During the Carboniferous, the Los Reyunos Thrust was reactivated as a normal fault, facilitating the sedimentation of carboniferous rocks thousands of meters thick in its hanging wall and later, during the Gondwanan deformation, it underwent a tectonic inversion. During the Andean cycle, the Permian–Triassic beds of the Choiyoi Group were deposited in relation to NW–SE trending normal faults, giving rise to rollover structures. Finally, during the Cenozoic, Andean compression gave rise to the formation of an open antiform, in whose core is the Mesoproterozoic–Paleozoic basement of the San Rafael Block. Facultad de Ciencias Naturales y Museo Articulo Articulo http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
San Rafael Block
Andes
Paleozoic basement
Chanic deformation
Gondwanan deformation
spellingShingle Geología
San Rafael Block
Andes
Paleozoic basement
Chanic deformation
Gondwanan deformation
García-Sansegundo, Joaquín
Farias, Pedro
Rubio-Ordóñez, Álvaro
Clariana, Pilar
Cingolani, Carlos Alberto
Heredia, Nemesio
Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen
topic_facet Geología
San Rafael Block
Andes
Paleozoic basement
Chanic deformation
Gondwanan deformation
description The Paleozoic pre-Carboniferous rocks of the San Rafael Block, located to the east of the Los Reyunos Gondwanan Thrust, show Chanic structures (Late Devonian–early Carboniferous) with east vergence, which were generated in the absence of metamorphism. This Paleozoic succession is unconformably located on the basement of Cuyania. The rocks, located to the west of the Los Reyunos Thrust, were deformed by two fold episodes, the first and main (D1) west verging, developed under low to very low-grade metamorphic conditions, and the second (D2) east verging and mainly developed near Los Reyunos Reservoir. Therefore, the Los Reyunos Thrust must be considered a reactivation of a Chanic structure during the Gondwanan Orogeny (late Carboniferous–early Permian). The ancient Chanic thrust could be responsible for the overlay of the hinterland of the western branch of the Chanic Orogen on the foreland of its eastern branch, at the end of the collision between the Cuyania and Chilenia subplates. The results of this work have been related to those of nearby areas located to the north and west, which has allowed the elaboration of a model that explains the characteristics of the Chanic Orogen in this area. During the Carboniferous, the Los Reyunos Thrust was reactivated as a normal fault, facilitating the sedimentation of carboniferous rocks thousands of meters thick in its hanging wall and later, during the Gondwanan deformation, it underwent a tectonic inversion. During the Andean cycle, the Permian–Triassic beds of the Choiyoi Group were deposited in relation to NW–SE trending normal faults, giving rise to rollover structures. Finally, during the Cenozoic, Andean compression gave rise to the formation of an open antiform, in whose core is the Mesoproterozoic–Paleozoic basement of the San Rafael Block.
format Articulo
Articulo
author García-Sansegundo, Joaquín
Farias, Pedro
Rubio-Ordóñez, Álvaro
Clariana, Pilar
Cingolani, Carlos Alberto
Heredia, Nemesio
author_facet García-Sansegundo, Joaquín
Farias, Pedro
Rubio-Ordóñez, Álvaro
Clariana, Pilar
Cingolani, Carlos Alberto
Heredia, Nemesio
author_sort García-Sansegundo, Joaquín
title Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen
title_short Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen
title_full Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen
title_fullStr Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen
title_full_unstemmed Polyorogenic structure of the San Rafael Block, Mendoza, Argentina: New data for the interpretation of the Chanic Orogen
title_sort polyorogenic structure of the san rafael block, mendoza, argentina: new data for the interpretation of the chanic orogen
publishDate 2023
url http://sedici.unlp.edu.ar/handle/10915/160106
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