Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication

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The Sierras Australes of Buenos Aires are located in the south-west corner Of the Province about 100 km west of Bahia Bianca. On the south-west flank of these hills, younger Palaeozoic sedimentary formations overlie poorly exposed granitic and volcanic basement rocks. Granitic Cerro Colorado outcrop...

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Autores principales: Massabie, A.C., Rossello, E.A., Linares, E., Párica, G., Powell, G.A.
Formato: Artículo publishedVersion
Publicado: 1997
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p281_Massabie
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v52_n4_p281_Massabie_oai
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id I28-R145-paper_00044822_v52_n4_p281_Massabie_oai
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spelling I28-R145-paper_00044822_v52_n4_p281_Massabie_oai2024-08-16 Massabie, A.C. Rossello, E.A. Linares, E. Párica, G. Powell, G.A. 1997 The Sierras Australes of Buenos Aires are located in the south-west corner Of the Province about 100 km west of Bahia Bianca. On the south-west flank of these hills, younger Palaeozoic sedimentary formations overlie poorly exposed granitic and volcanic basement rocks. Granitic Cerro Colorado outcrops, located 16 km strike to the south of the town of San Martin de Tours, and near Lago Los Chilenos, have been included in this broadly interpreted "basement" in many previous geological studies. This contribution is mainly based on detailed structural mapping of the cerro Colorado area, and systematic sampling of granitic and sedimentary rocks for petrographical, microtectonic and Rb/Sr isotopic age analysis. In contrast to previous studies, two Phanerozoic granitic units have been recognised and mapped in the cerro Colorado area of Sierras Australes. The older one, the Cerro Colorado Granite (CO, is composed of foliated and sheared anisotropic granitic rocks with a Rb/Sr isochron age of 381±9 Ma (ir= 0.7035 ). The younger one, Los Chilenos Granite (LCh), consists of isotropic granophiric microgranite with a Rb/Sr isochron age of 140 ±14 Ma (ir= 0.7126). This granite has intrusive contacts with both, the folded quartzite of the Mascota Formation and Cerro Colorado Granite (CC).The older tectomagmatic event (CO is correlated with the compressive Chanica Orogeny, which was associated in the Sierras Australes region, with the eruption of La Mascota - La Hermita rhyolites (360±21 Ma) and the unconformity between Lolén Formation (Middle Devonian) and Sauce Grande Formation (Carboniferous).The younger intrusive event of Los Chilenos Granite (LCh) is considered to be associated with an extensional tectonic regime during the Late Jurassic initial rifting of the Atlantic Ocean. O 1999 Asociación Gcológica. Fil:Massabie, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rossello, E.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Linares, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p281_Massabie info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 1997;52(4):281-289 Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication 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_v52_n4_p281_Massabie_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
description The Sierras Australes of Buenos Aires are located in the south-west corner Of the Province about 100 km west of Bahia Bianca. On the south-west flank of these hills, younger Palaeozoic sedimentary formations overlie poorly exposed granitic and volcanic basement rocks. Granitic Cerro Colorado outcrops, located 16 km strike to the south of the town of San Martin de Tours, and near Lago Los Chilenos, have been included in this broadly interpreted "basement" in many previous geological studies. This contribution is mainly based on detailed structural mapping of the cerro Colorado area, and systematic sampling of granitic and sedimentary rocks for petrographical, microtectonic and Rb/Sr isotopic age analysis. In contrast to previous studies, two Phanerozoic granitic units have been recognised and mapped in the cerro Colorado area of Sierras Australes. The older one, the Cerro Colorado Granite (CO, is composed of foliated and sheared anisotropic granitic rocks with a Rb/Sr isochron age of 381±9 Ma (ir= 0.7035 ). The younger one, Los Chilenos Granite (LCh), consists of isotropic granophiric microgranite with a Rb/Sr isochron age of 140 ±14 Ma (ir= 0.7126). This granite has intrusive contacts with both, the folded quartzite of the Mascota Formation and Cerro Colorado Granite (CC).The older tectomagmatic event (CO is correlated with the compressive Chanica Orogeny, which was associated in the Sierras Australes region, with the eruption of La Mascota - La Hermita rhyolites (360±21 Ma) and the unconformity between Lolén Formation (Middle Devonian) and Sauce Grande Formation (Carboniferous).The younger intrusive event of Los Chilenos Granite (LCh) is considered to be associated with an extensional tectonic regime during the Late Jurassic initial rifting of the Atlantic Ocean. O 1999 Asociación Gcológica.
format Artículo
Artículo
publishedVersion
author Massabie, A.C.
Rossello, E.A.
Linares, E.
Párica, G.
Powell, G.A.
spellingShingle Massabie, A.C.
Rossello, E.A.
Linares, E.
Párica, G.
Powell, G.A.
Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication
author_facet Massabie, A.C.
Rossello, E.A.
Linares, E.
Párica, G.
Powell, G.A.
author_sort Massabie, A.C.
title Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication
title_short Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication
title_full Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication
title_fullStr Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication
title_full_unstemmed Granito Los Chilenos: Una nueva unidad granitica jurásica en Cerro Colorado, Sierras Australes de Buenos Aires. Implicancias tectónicas Los Chilenos eranite: a new Jurassic granite unit in Cerro Colorado, Sierras Australes de Buenos Aires. Tectonic implication
title_sort granito los chilenos: una nueva unidad granitica jurásica en cerro colorado, sierras australes de buenos aires. implicancias tectónicas los chilenos eranite: a new jurassic granite unit in cerro colorado, sierras australes de buenos aires. tectonic implication
publishDate 1997
url http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p281_Massabie
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v52_n4_p281_Massabie_oai
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