Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina

Major, trace, and rare-earth element data for Puncoviscana Formation metasediments were used to constrain their provenance and tectonic setting. This unit, which crops out in northwest Argentina, consists mainly of pelite-greywacke turbidite sequences. Incipient regional metamorphism and a polyphase...

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Autores principales: Do Campo, M., Ribeiro Guevara, S.
Formato: JOUR
Materias:
Geochemistry
Metasediments
Passive margin
Pre-cambrian
Turbidites
metasediment
Proterozoic
Argentina
South America
Western Hemisphere
World
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v19_n2_p143_DoCampo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v19_n2_p143_DoCampo2023-10-03T15:42:38Z Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina Do Campo, M. Ribeiro Guevara, S. Geochemistry Metasediments Passive margin Pre-cambrian Turbidites metasediment Proterozoic Argentina South America Western Hemisphere World Major, trace, and rare-earth element data for Puncoviscana Formation metasediments were used to constrain their provenance and tectonic setting. This unit, which crops out in northwest Argentina, consists mainly of pelite-greywacke turbidite sequences. Incipient regional metamorphism and a polyphase deformation, with a main deformation during the latest Proterozoic-earliest Cambrian Braziliano orogeny, affected the sedimentary sequences. The enrichment in light rare-earth and other incompatible trace elements over compatible ones, as well as the high and uniform Th/Sc ratios, indicate a predominance of upper-crust acid rocks as parental material. Some chemical characteristics of these rocks, such as their high Th/U, Rb/Sr, and Zr/Sc ratios, imply sedimentary recycling. On the basis of tectonic discriminant diagrams that employ trace elements considered relatively immobile during low-grade metamorphism, a passive margin setting can be inferred. Moreover, the comparison of the trace element contents of Puncoviscana metapelites with those of mudstones deposited in known tectonic settings shows the closest matching with passive margin shales. © 2005 Elsevier Ltd. All rights reserved. Fil:Do Campo, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_08959811_v19_n2_p143_DoCampo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Geochemistry
Metasediments
Passive margin
Pre-cambrian
Turbidites
metasediment
Proterozoic
Argentina
South America
Western Hemisphere
World
spellingShingle Geochemistry
Metasediments
Passive margin
Pre-cambrian
Turbidites
metasediment
Proterozoic
Argentina
South America
Western Hemisphere
World
Do Campo, M.
Ribeiro Guevara, S.
Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
topic_facet Geochemistry
Metasediments
Passive margin
Pre-cambrian
Turbidites
metasediment
Proterozoic
Argentina
South America
Western Hemisphere
World
description Major, trace, and rare-earth element data for Puncoviscana Formation metasediments were used to constrain their provenance and tectonic setting. This unit, which crops out in northwest Argentina, consists mainly of pelite-greywacke turbidite sequences. Incipient regional metamorphism and a polyphase deformation, with a main deformation during the latest Proterozoic-earliest Cambrian Braziliano orogeny, affected the sedimentary sequences. The enrichment in light rare-earth and other incompatible trace elements over compatible ones, as well as the high and uniform Th/Sc ratios, indicate a predominance of upper-crust acid rocks as parental material. Some chemical characteristics of these rocks, such as their high Th/U, Rb/Sr, and Zr/Sc ratios, imply sedimentary recycling. On the basis of tectonic discriminant diagrams that employ trace elements considered relatively immobile during low-grade metamorphism, a passive margin setting can be inferred. Moreover, the comparison of the trace element contents of Puncoviscana metapelites with those of mudstones deposited in known tectonic settings shows the closest matching with passive margin shales. © 2005 Elsevier Ltd. All rights reserved.
format JOUR
author Do Campo, M.
Ribeiro Guevara, S.
author_facet Do Campo, M.
Ribeiro Guevara, S.
author_sort Do Campo, M.
title Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
title_short Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
title_full Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
title_fullStr Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
title_full_unstemmed Provenance analysis and tectonic setting of late Neoproterozoic metasedimentary successions in NW Argentina
title_sort provenance analysis and tectonic setting of late neoproterozoic metasedimentary successions in nw argentina
url http://hdl.handle.net/20.500.12110/paper_08959811_v19_n2_p143_DoCampo
work_keys_str_mv AT docampom provenanceanalysisandtectonicsettingoflateneoproterozoicmetasedimentarysuccessionsinnwargentina
AT ribeiroguevaras provenanceanalysisandtectonicsettingoflateneoproterozoicmetasedimentarysuccessionsinnwargentina
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