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

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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Detalles Bibliográficos
Autor principal: Cerredo, Maria Elena
Publicado: 2003
Materias:
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v58_n4_p525_LopezdeLuchi
http://hdl.handle.net/20.500.12110/paper_00044822_v58_n4_p525_LopezdeLuchi
Aporte de:
id paper:paper_00044822_v58_n4_p525_LopezdeLuchi
record_format dspace
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (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
Cerredo, Maria Elena
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.
author Cerredo, Maria Elena
author_facet Cerredo, Maria Elena
author_sort Cerredo, Maria Elena
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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v58_n4_p525_LopezdeLuchi
http://hdl.handle.net/20.500.12110/paper_00044822_v58_n4_p525_LopezdeLuchi
work_keys_str_mv AT cerredomariaelena provenanceandtectonicsettingoftheprotolithsofthemetamorphiccomplexesofsierradesanluis
bdutipo_str Repositorios
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