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
Lenguaje:Inglés
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
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v61_n2_p218_Gargiulo2023-06-12T16:40:09Z Metamorphic fades and relative ages of rocks on the eastern part of Brazo Huemul, Neuquén province Rev. Asoc. Geol. Argent. 2006;61(2):218-230 Gargiulo, M.F. 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 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. 2006 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v61_n2_p218_Gargiulo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
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
work_keys_str_mv AT gargiulomf metamorphicfadesandrelativeagesofrocksontheeasternpartofbrazohuemulneuquenprovince
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