Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province

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The study of mineral assemblages and metamorphic facies in rocks exposed on the eastern margin of Brazo Huemul, Nahuel Huapi Lake, allowed the reconsideration of the temporal succession of units whose outcrops are isolated and difficult to locate due to the exuberant forest that covers the southeste...

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Autor principal:	Gargiulo, M.F.
Formato:	Artículo publishedVersion
Publicado:	2006
Materias:	Basic dikes Brazo Huemul Cordilleran Patagonian Batholite Subcordilleran Patagonian Batholite Thermal metamorphism batholith Cretaceous dike metamorphic facies metamorphism zeolite Argentina Nahuel Huapi Lake Neuquen South America Oxalis tuberosa
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v61_n2_p218_Gargiulo https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v61_n2_p218_Gargiulo_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_00044822_v61_n2_p218_Gargiulo_oai
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spelling	I28-R145-paper_00044822_v61_n2_p218_Gargiulo_oai2024-08-16 Gargiulo, M.F. 2006 The study of mineral assemblages and metamorphic facies in rocks exposed on the eastern margin of Brazo Huemul, Nahuel Huapi Lake, allowed the reconsideration of the temporal succession of units whose outcrops are isolated and difficult to locate due to the exuberant forest that covers the southestern part of Neuquén province. The rocks exposed in the study area are mainly of tonalitic composition and have been correlated with the Subcordilleran Patagonian Batholith because they are crosscut by two different types of dikes. One group of dikes shows an albite -chlorite - epidote - cummingtonite/grunerite -hornblende mineral assemblage as a consequence of a thermal metamorphic event transitional between albite - epidote hornfels facies and hornblende hornfels conditions. This process has been attributed to the emplacement of the Cordilleran Patagonian Batholith of Cretaceous age. Because of this, the hornfels dikes were correlated with Montes de Oca Formation. The other group of dikes shows a chlorite + pumpellyite + kumontite + chlorite/esmectite + iron oxides assemblage indicating metamorphism in zeolite facies of high temperature or, sometimes shows propilitic alteration and these dikes have been correlated with the Ventana Formation. The differences between these two types of dikes allow the discussion of the relative age of the tonalitic rocks that host them. In this paper it is proposed that this tonalitic body is of Low to Middle Jurassic age. © 2006 Asociación Geológica Argentina. Fil:Gargiulo, M.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v61_n2_p218_Gargiulo info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2006;61(2):218-230 Basic dikes Brazo Huemul Cordilleran Patagonian Batholite Subcordilleran Patagonian Batholite Thermal metamorphism batholith Cretaceous dike metamorphic facies metamorphism zeolite Argentina Brazo Huemul Nahuel Huapi Lake Neuquen South America Oxalis tuberosa Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v61_n2_p218_Gargiulo_oai
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-145
collection	Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic	Basic dikes Brazo Huemul Cordilleran Patagonian Batholite Subcordilleran Patagonian Batholite Thermal metamorphism batholith Cretaceous dike metamorphic facies metamorphism zeolite Argentina Brazo Huemul Nahuel Huapi Lake Neuquen South America Oxalis tuberosa
spellingShingle	Basic dikes Brazo Huemul Cordilleran Patagonian Batholite Subcordilleran Patagonian Batholite Thermal metamorphism batholith Cretaceous dike metamorphic facies metamorphism zeolite Argentina Brazo Huemul Nahuel Huapi Lake Neuquen South America Oxalis tuberosa Gargiulo, M.F. Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province
topic_facet	Basic dikes Brazo Huemul Cordilleran Patagonian Batholite Subcordilleran Patagonian Batholite Thermal metamorphism batholith Cretaceous dike metamorphic facies metamorphism zeolite Argentina Brazo Huemul Nahuel Huapi Lake Neuquen South America Oxalis tuberosa
description	The study of mineral assemblages and metamorphic facies in rocks exposed on the eastern margin of Brazo Huemul, Nahuel Huapi Lake, allowed the reconsideration of the temporal succession of units whose outcrops are isolated and difficult to locate due to the exuberant forest that covers the southestern part of Neuquén province. The rocks exposed in the study area are mainly of tonalitic composition and have been correlated with the Subcordilleran Patagonian Batholith because they are crosscut by two different types of dikes. One group of dikes shows an albite -chlorite - epidote - cummingtonite/grunerite -hornblende mineral assemblage as a consequence of a thermal metamorphic event transitional between albite - epidote hornfels facies and hornblende hornfels conditions. This process has been attributed to the emplacement of the Cordilleran Patagonian Batholith of Cretaceous age. Because of this, the hornfels dikes were correlated with Montes de Oca Formation. The other group of dikes shows a chlorite + pumpellyite + kumontite + chlorite/esmectite + iron oxides assemblage indicating metamorphism in zeolite facies of high temperature or, sometimes shows propilitic alteration and these dikes have been correlated with the Ventana Formation. The differences between these two types of dikes allow the discussion of the relative age of the tonalitic rocks that host them. In this paper it is proposed that this tonalitic body is of Low to Middle Jurassic age. © 2006 Asociación Geológica Argentina.
format	Artículo Artículo publishedVersion
author	Gargiulo, M.F.
author_facet	Gargiulo, M.F.
author_sort	Gargiulo, M.F.
title	Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province
title_short	Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province
title_full	Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province
title_fullStr	Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province
title_full_unstemmed	Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province
title_sort	metamorphic fades and relative ages of rocks on the eastern part of brazo huemul, neuquén province
publishDate	2006
url	http://hdl.handle.net/20.500.12110/paper_00044822_v61_n2_p218_Gargiulo https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v61_n2_p218_Gargiulo_oai
work_keys_str_mv	AT gargiulomf metamorphicfadesandrelativeagesofrocksontheeasternpartofbrazohuemulneuquenprovince
_version_	1809356853011808256

Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province

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