Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance

The Caucete Group is a low-grade metasedimentary sequence of probable late Neoproterozoic-Cambrian age. It is exposed on the western flank of the Sierra de Pie de Palo, a basement block of the Cuyania terrane from western Argentina. The geochemical composition (major, trace and rare-earth elements,...

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Autores principales: Naipauer, M., Cingolani, C.A., Vujovich, G.I., Chemale Jr., F.
Formato: JOUR
Materias:
Caucete group
Cuyania terrane
Lithogeochemistry
Nd isotopic composition
Provenance
Cambrian
geochemistry
isotopic composition
metasedimentary rock
neodymium isotope
Proterozoic
provenance
rare earth element
trace element
Argentina
San Juan [Argentina]
Sierra de Pie de Palo
Sierras Pampeanas
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_08959811_v30_n2_p84_Naipauer
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_08959811_v30_n2_p84_Naipauer2023-10-03T15:42:56Z Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance Naipauer, M. Cingolani, C.A. Vujovich, G.I. Chemale Jr., F. Caucete group Cuyania terrane Lithogeochemistry Nd isotopic composition Provenance Cambrian geochemistry isotopic composition metasedimentary rock neodymium isotope Proterozoic provenance rare earth element trace element Argentina San Juan [Argentina] Sierra de Pie de Palo Sierras Pampeanas The Caucete Group is a low-grade metasedimentary sequence of probable late Neoproterozoic-Cambrian age. It is exposed on the western flank of the Sierra de Pie de Palo, a basement block of the Cuyania terrane from western Argentina. The geochemical composition (major, trace and rare-earth elements, and Sm-Nd isotopes) of the El Quemado, La Paz, El Desecho, and Angacos formations (Caucete Group) was used to characterize the sedimentary provenance. We recognized two types of sources: A felsic source (crustal signature) and another mafic source with juvenile signature. Provenance is interpreted to be the mixing between Paleoproterozoic felsic rocks and Mesoproterozoic-Neoproterozoic juvenile rocks sources. This is supported by previous geochronological studies. The Cuyania basement is interpreted to be the Mesoproterozoic and Neoproterozoic juvenile component defined in the Caucete Group (e.g.: ophiolite assemblage of Sierra de Pie de Palo). The Cuyania basement is also considered to be the felsic source (paragneisses and meta-greywackes of the Pie de Palo Complex). We do not consider Gondwana as a provenance source based on the discrepancies in the Sm-Nd isotopic signatures and the detrital zircon provenance ages between the Caucete Group and the surrounding units that are considered to be autochthonous to the southern margin of Gondwana. The Caucete Group Laurentian Sm-Nd isotopic signature suggests that this sector could have been part of the source area. Hence an allochthonous origin for the Caucete Group (Cuyania terrane), derived from southern Laurentia, is supported for the geochemical results presented in this contribution. © 2010 Elsevier Ltd. Fil:Naipauer, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vujovich, G.I. 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_v30_n2_p84_Naipauer
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Caucete group
Cuyania terrane
Lithogeochemistry
Nd isotopic composition
Provenance
Cambrian
geochemistry
isotopic composition
metasedimentary rock
neodymium isotope
Proterozoic
provenance
rare earth element
trace element
Argentina
San Juan [Argentina]
Sierra de Pie de Palo
Sierras Pampeanas
spellingShingle Caucete group
Cuyania terrane
Lithogeochemistry
Nd isotopic composition
Provenance
Cambrian
geochemistry
isotopic composition
metasedimentary rock
neodymium isotope
Proterozoic
provenance
rare earth element
trace element
Argentina
San Juan [Argentina]
Sierra de Pie de Palo
Sierras Pampeanas
Naipauer, M.
Cingolani, C.A.
Vujovich, G.I.
Chemale Jr., F.
Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
topic_facet Caucete group
Cuyania terrane
Lithogeochemistry
Nd isotopic composition
Provenance
Cambrian
geochemistry
isotopic composition
metasedimentary rock
neodymium isotope
Proterozoic
provenance
rare earth element
trace element
Argentina
San Juan [Argentina]
Sierra de Pie de Palo
Sierras Pampeanas
description The Caucete Group is a low-grade metasedimentary sequence of probable late Neoproterozoic-Cambrian age. It is exposed on the western flank of the Sierra de Pie de Palo, a basement block of the Cuyania terrane from western Argentina. The geochemical composition (major, trace and rare-earth elements, and Sm-Nd isotopes) of the El Quemado, La Paz, El Desecho, and Angacos formations (Caucete Group) was used to characterize the sedimentary provenance. We recognized two types of sources: A felsic source (crustal signature) and another mafic source with juvenile signature. Provenance is interpreted to be the mixing between Paleoproterozoic felsic rocks and Mesoproterozoic-Neoproterozoic juvenile rocks sources. This is supported by previous geochronological studies. The Cuyania basement is interpreted to be the Mesoproterozoic and Neoproterozoic juvenile component defined in the Caucete Group (e.g.: ophiolite assemblage of Sierra de Pie de Palo). The Cuyania basement is also considered to be the felsic source (paragneisses and meta-greywackes of the Pie de Palo Complex). We do not consider Gondwana as a provenance source based on the discrepancies in the Sm-Nd isotopic signatures and the detrital zircon provenance ages between the Caucete Group and the surrounding units that are considered to be autochthonous to the southern margin of Gondwana. The Caucete Group Laurentian Sm-Nd isotopic signature suggests that this sector could have been part of the source area. Hence an allochthonous origin for the Caucete Group (Cuyania terrane), derived from southern Laurentia, is supported for the geochemical results presented in this contribution. © 2010 Elsevier Ltd.
format JOUR
author Naipauer, M.
Cingolani, C.A.
Vujovich, G.I.
Chemale Jr., F.
author_facet Naipauer, M.
Cingolani, C.A.
Vujovich, G.I.
Chemale Jr., F.
author_sort Naipauer, M.
title Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
title_short Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
title_full Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
title_fullStr Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
title_full_unstemmed Geochemistry of Neoproterozoic-Cambrian metasedimentary rocks of the Caucete Group, Sierra de Pie de Palo, Argentina: Implications for their provenance
title_sort geochemistry of neoproterozoic-cambrian metasedimentary rocks of the caucete group, sierra de pie de palo, argentina: implications for their provenance
url http://hdl.handle.net/20.500.12110/paper_08959811_v30_n2_p84_Naipauer
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AT cingolanica geochemistryofneoproterozoiccambrianmetasedimentaryrocksofthecaucetegroupsierradepiedepaloargentinaimplicationsfortheirprovenance
AT vujovichgi geochemistryofneoproterozoiccambrianmetasedimentaryrocksofthecaucetegroupsierradepiedepaloargentinaimplicationsfortheirprovenance
AT chemalejrf geochemistryofneoproterozoiccambrianmetasedimentaryrocksofthecaucetegroupsierradepiedepaloargentinaimplicationsfortheirprovenance
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