Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis

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A major and trace element based characterization of the metasedimentary protoliths of three metamorphic units of Sierra de San Luis (Pringles Metamorphic Complex, San Luis Formation and Conlara Metamorphic Complex) is presented. Geochemistry indicates a dominance of shales in the protoliths of San L...

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Autores principales:	López de Luchi, M.G., Cerredo, M.E., Siegesmund, S., Steenken, A., Wemmer, K.
Formato:	Artículo publishedVersion
Publicado:	2003
Materias:	Early Paleozoic Gondwana margin Protoliths metamorphic units Provenance Tectonic setting continental margin crustal evolution Gondwana metamorphic facies Paleozoic protolith tectonic setting Argentina San Luis Sierra de San Luis South America Western Hemisphere World
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v58_n4_p525_LopezdeLuchi http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v58_n4_p525_LopezdeLuchi_oai
Aporte de:	Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires

id	I28-R145-paper_00044822_v58_n4_p525_LopezdeLuchi_oai
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spelling	I28-R145-paper_00044822_v58_n4_p525_LopezdeLuchi_oai2020-10-19 López de Luchi, M.G. Cerredo, M.E. Siegesmund, S. Steenken, A. Wemmer, K. 2003 A major and trace element based characterization of the metasedimentary protoliths of three metamorphic units of Sierra de San Luis (Pringles Metamorphic Complex, San Luis Formation and Conlara Metamorphic Complex) is presented. Geochemistry indicates a dominance of shales in the protoliths of San Luis Formation, whereas greywackes and shales made up the Conlara Metamorphic complex and mainly greywackes, the Pringles Metamorphic Complex. Both major element data and trace element ratios (i.e. Th/Sc, Th/U,) indicate a source with an average upper crustal composition for the protoliths of the Pringles Metamorphic Complex, the San Luis Formation and the shales of the Conlara Metamorphic complex. A component with less evolved signature may be inferred for the metagreywackes of the Conlara metamorphic Complex. Mixed sourced detritus are indicated for the three units with clastic material resulting mainly from both andesitic and acidic/recycled detritus. The overall data consistently suggest a continental island arc and/or active margin setting as the more probable geodynamic scenario for the deposition of the sedimentary precursors of the studied units. In this context, a back-arc setting can account for the mixed nature of the inferred source areas with uplifted old basement and arc-related detritus as the end members of the mixtures. The inferred back-arc basin would have evolved through the Cambrian receiving the sediments derived from the Pampean Orogen to the east combined with probably some old crust exposures and to the west the source might have been controlled by the active continental margin. © 2003 Asociación Geológica Argentina. Fil:Cerredo, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00044822_v58_n4_p525_LopezdeLuchi info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Rev. Asoc. Geol. Argent. 2003;58(4):525-540 Early Paleozoic Gondwana margin Protoliths metamorphic units Provenance Tectonic setting continental margin crustal evolution Gondwana metamorphic facies Paleozoic protolith tectonic setting Argentina San Luis Sierra de San Luis South America Western Hemisphere World Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v58_n4_p525_LopezdeLuchi_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	Early Paleozoic Gondwana margin Protoliths metamorphic units Provenance Tectonic setting continental margin crustal evolution Gondwana metamorphic facies Paleozoic protolith tectonic setting Argentina San Luis Sierra de San Luis South America Western Hemisphere World
spellingShingle	Early Paleozoic Gondwana margin Protoliths metamorphic units Provenance Tectonic setting continental margin crustal evolution Gondwana metamorphic facies Paleozoic protolith tectonic setting Argentina San Luis Sierra de San Luis South America Western Hemisphere World López de Luchi, M.G. Cerredo, M.E. Siegesmund, S. Steenken, A. Wemmer, K. Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
topic_facet	Early Paleozoic Gondwana margin Protoliths metamorphic units Provenance Tectonic setting continental margin crustal evolution Gondwana metamorphic facies Paleozoic protolith tectonic setting Argentina San Luis Sierra de San Luis South America Western Hemisphere World
description	A major and trace element based characterization of the metasedimentary protoliths of three metamorphic units of Sierra de San Luis (Pringles Metamorphic Complex, San Luis Formation and Conlara Metamorphic Complex) is presented. Geochemistry indicates a dominance of shales in the protoliths of San Luis Formation, whereas greywackes and shales made up the Conlara Metamorphic complex and mainly greywackes, the Pringles Metamorphic Complex. Both major element data and trace element ratios (i.e. Th/Sc, Th/U,) indicate a source with an average upper crustal composition for the protoliths of the Pringles Metamorphic Complex, the San Luis Formation and the shales of the Conlara Metamorphic complex. A component with less evolved signature may be inferred for the metagreywackes of the Conlara metamorphic Complex. Mixed sourced detritus are indicated for the three units with clastic material resulting mainly from both andesitic and acidic/recycled detritus. The overall data consistently suggest a continental island arc and/or active margin setting as the more probable geodynamic scenario for the deposition of the sedimentary precursors of the studied units. In this context, a back-arc setting can account for the mixed nature of the inferred source areas with uplifted old basement and arc-related detritus as the end members of the mixtures. The inferred back-arc basin would have evolved through the Cambrian receiving the sediments derived from the Pampean Orogen to the east combined with probably some old crust exposures and to the west the source might have been controlled by the active continental margin. © 2003 Asociación Geológica Argentina.
format	Artículo Artículo publishedVersion
author	López de Luchi, M.G. Cerredo, M.E. Siegesmund, S. Steenken, A. Wemmer, K.
author_facet	López de Luchi, M.G. Cerredo, M.E. Siegesmund, S. Steenken, A. Wemmer, K.
author_sort	López de Luchi, M.G.
title	Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
title_short	Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
title_full	Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
title_fullStr	Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
title_full_unstemmed	Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis
title_sort	provenance and tectonic setting of the protoliths of the metamorphic complexes of sierra de san luis
publishDate	2003
url	http://hdl.handle.net/20.500.12110/paper_00044822_v58_n4_p525_LopezdeLuchi http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00044822_v58_n4_p525_LopezdeLuchi_oai
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Provenance and tectonic setting of the protoliths of the Metamorphic Complexes of Sierra de San Luis

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