The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region

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Small outcrops of biotitic-amphibolic schists and amphibolites found in two localities suggest that the Cushamen Formation is host rock of the Central Patagonian Batholith in Gastre. The characteristics of these rocks were investigated using structural, petrographic, magnetic fabric, and garnet chem...

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Autores principales:	Zaffarana, C.B., Montenegro, T., Somoza, R.
Formato:	JOUR
Materias:	Basement rocks Central patagonian batholith Garnet zonation Gastre Gastre fault system North-patagonian massif amphibolite basement rock batholith biotite deformation mechanism displacement fault zone garnet Jurassic low temperature schist structural geology Triassic Argentina Chubut Cushamen Patagonia
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v69_n1_p106_Zaffarana
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00044822_v69_n1_p106_Zaffarana
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spelling	todo:paper_00044822_v69_n1_p106_Zaffarana2023-10-03T13:58:56Z The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region Zaffarana, C.B. Montenegro, T. Somoza, R. Basement rocks Central patagonian batholith Garnet zonation Gastre Gastre fault system North-patagonian massif amphibolite basement rock batholith biotite deformation mechanism displacement fault zone garnet Jurassic low temperature schist structural geology Triassic Argentina Chubut Cushamen Patagonia Small outcrops of biotitic-amphibolic schists and amphibolites found in two localities suggest that the Cushamen Formation is host rock of the Central Patagonian Batholith in Gastre. The characteristics of these rocks were investigated using structural, petrographic, magnetic fabric, and garnet chemical-zonation studies. Garnet is observed as a late product of contact metamorphism. Structural data from the studied area and from other localities in the region are in conflict with models that invoke the occurrence of uniform, large-scale dextral displacements along the Gastre lineament in Mesosoic times. Rather, the data suggest that the Gastre granitoids record heterogeneous low-temperature deformation of likely Late Triassic age. This low-temperature deformation appears as small, localized outcrops, and we suggest that it is related to the accommodation of the successive magma batches that built the Central Patagonian Batholith. Fil:Zaffarana, C.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Montenegro, T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Somoza, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v69_n1_p106_Zaffarana
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Basement rocks Central patagonian batholith Garnet zonation Gastre Gastre fault system North-patagonian massif amphibolite basement rock batholith biotite deformation mechanism displacement fault zone garnet Jurassic low temperature schist structural geology Triassic Argentina Chubut Cushamen Patagonia
spellingShingle	Basement rocks Central patagonian batholith Garnet zonation Gastre Gastre fault system North-patagonian massif amphibolite basement rock batholith biotite deformation mechanism displacement fault zone garnet Jurassic low temperature schist structural geology Triassic Argentina Chubut Cushamen Patagonia Zaffarana, C.B. Montenegro, T. Somoza, R. The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
topic_facet	Basement rocks Central patagonian batholith Garnet zonation Gastre Gastre fault system North-patagonian massif amphibolite basement rock batholith biotite deformation mechanism displacement fault zone garnet Jurassic low temperature schist structural geology Triassic Argentina Chubut Cushamen Patagonia
description	Small outcrops of biotitic-amphibolic schists and amphibolites found in two localities suggest that the Cushamen Formation is host rock of the Central Patagonian Batholith in Gastre. The characteristics of these rocks were investigated using structural, petrographic, magnetic fabric, and garnet chemical-zonation studies. Garnet is observed as a late product of contact metamorphism. Structural data from the studied area and from other localities in the region are in conflict with models that invoke the occurrence of uniform, large-scale dextral displacements along the Gastre lineament in Mesosoic times. Rather, the data suggest that the Gastre granitoids record heterogeneous low-temperature deformation of likely Late Triassic age. This low-temperature deformation appears as small, localized outcrops, and we suggest that it is related to the accommodation of the successive magma batches that built the Central Patagonian Batholith.
format	JOUR
author	Zaffarana, C.B. Montenegro, T. Somoza, R.
author_facet	Zaffarana, C.B. Montenegro, T. Somoza, R.
author_sort	Zaffarana, C.B.
title	The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
title_short	The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
title_full	The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
title_fullStr	The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
title_full_unstemmed	The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region
title_sort	host rock of the central patagonian batholith in gastre: further insights on the late triassic to early jurassic deformation in the region
url	http://hdl.handle.net/20.500.12110/paper_00044822_v69_n1_p106_Zaffarana
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The host rock of the central Patagonian batholith in Gastre: Further insights on the late Triassic to early Jurassic deformation in the region

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