Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina

Autores
Escayola, Monica Patricia; Pimentel, Márcio M.; Armstrong, Richard
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Eastern Pampean Ranges comprise high-grade supracrustal sequences with linear belts of mafic-ultramafic bodies representing ophiolite remnants. New U-Pb and Nd isotopic data suggest that the tectonic evolution of the Pampean Ranges started ca. 640 Ma with the deposition of supracrustal sequences in a backarc basin between a Neoproterozoic magmatic arc to the east and the Pampia terrane to the west. Ophiolite remnants of this backarc basin yielded a whole-rock isochron indicating the age of 647 ± 77 Ma (2σ) and εNd (initial time [T]) of +5.2. Sensitive high-resolution ion microprobe U-Pb data for detrital metasediments show provenance patterns with two main age populations: the older 1.1-0.9 Ga, and the younger between ca. 0.7 and 0.6 Ga. The Neoproterozoic population is relatively more abundant in sediments of the easternmost units of the Eastern Pampean Ranges and becomes less abundant toward the west. Depleted mantle ages show a similar pattern, with ages generally increasing from east (1.42 Ga) to west (1.76 Ga), suggesting the presence of Neoproterozoic sources to the east of the ranges. The provenance data do not support previous evolution models for the Eastern Pampean Ranges, according to which the supracrustal sequence represents the passive margin of the Río de la Plata craton. Early Cambrian collision and high-grade metamorphism mark the final stages of evolution of the belt and were shortly followed by calc-alkaline metaluminous and peraluminous granitic magmatism ca. 530-514 Ma. The results suggest that the geological evolution of the Eastern Pampean Ranges took place between ca. 640 and 514 Ma, coeval with other Brasiliano orogens in Brazil (e.g., the Paraguay and Araguaia fold belts).
Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Pimentel, Márcio M.. Universidade do Brasília; Brasil
Fil: Armstrong, Richard. Australian National University; Australia
Materia
NEOPROTEROZOIC SUBDUCTION
PAMPEAN RANGES
PROVENANCE
SHRIMP
SM-ND AGES
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/92819
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/92819
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, ArgentinaEscayola, Monica PatriciaPimentel, Márcio M.Armstrong, RichardNEOPROTEROZOIC SUBDUCTIONPAMPEAN RANGESPROVENANCESHRIMPSM-ND AGEShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Eastern Pampean Ranges comprise high-grade supracrustal sequences with linear belts of mafic-ultramafic bodies representing ophiolite remnants. New U-Pb and Nd isotopic data suggest that the tectonic evolution of the Pampean Ranges started ca. 640 Ma with the deposition of supracrustal sequences in a backarc basin between a Neoproterozoic magmatic arc to the east and the Pampia terrane to the west. Ophiolite remnants of this backarc basin yielded a whole-rock isochron indicating the age of 647 ± 77 Ma (2σ) and εNd (initial time [T]) of +5.2. Sensitive high-resolution ion microprobe U-Pb data for detrital metasediments show provenance patterns with two main age populations: the older 1.1-0.9 Ga, and the younger between ca. 0.7 and 0.6 Ga. The Neoproterozoic population is relatively more abundant in sediments of the easternmost units of the Eastern Pampean Ranges and becomes less abundant toward the west. Depleted mantle ages show a similar pattern, with ages generally increasing from east (1.42 Ga) to west (1.76 Ga), suggesting the presence of Neoproterozoic sources to the east of the ranges. The provenance data do not support previous evolution models for the Eastern Pampean Ranges, according to which the supracrustal sequence represents the passive margin of the Río de la Plata craton. Early Cambrian collision and high-grade metamorphism mark the final stages of evolution of the belt and were shortly followed by calc-alkaline metaluminous and peraluminous granitic magmatism ca. 530-514 Ma. The results suggest that the geological evolution of the Eastern Pampean Ranges took place between ca. 640 and 514 Ma, coeval with other Brasiliano orogens in Brazil (e.g., the Paraguay and Araguaia fold belts).Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Pimentel, Márcio M.. Universidade do Brasília; BrasilFil: Armstrong, Richard. Australian National University; AustraliaGeological Society of America2007-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/92819Escayola, Monica Patricia; Pimentel, Márcio M.; Armstrong, Richard; Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina; Geological Society of America; Geology; 35; 6; 6-2007; 495-4980091-7613CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/geology/article-abstract/35/6/495/129864/Neoproterozoic-backarc-basin-Sensitive-highinfo:eu-repo/semantics/altIdentifier/doi/10.1130/G23549A.1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:47:27Zoai:ri.conicet.gov.ar:11336/92819instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 09:47:28.027CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
title Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
spellingShingle Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
Escayola, Monica Patricia
NEOPROTEROZOIC SUBDUCTION
PAMPEAN RANGES
PROVENANCE
SHRIMP
SM-ND AGES
title_short Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
title_full Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
title_fullStr Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
title_full_unstemmed Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
title_sort Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina
dc.creator.none.fl_str_mv Escayola, Monica Patricia
Pimentel, Márcio M.
Armstrong, Richard
author Escayola, Monica Patricia
author_facet Escayola, Monica Patricia
Pimentel, Márcio M.
Armstrong, Richard
author_role author
author2 Pimentel, Márcio M.
Armstrong, Richard
author2_role author
author
dc.subject.none.fl_str_mv NEOPROTEROZOIC SUBDUCTION
PAMPEAN RANGES
PROVENANCE
SHRIMP
SM-ND AGES
topic NEOPROTEROZOIC SUBDUCTION
PAMPEAN RANGES
PROVENANCE
SHRIMP
SM-ND AGES
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Eastern Pampean Ranges comprise high-grade supracrustal sequences with linear belts of mafic-ultramafic bodies representing ophiolite remnants. New U-Pb and Nd isotopic data suggest that the tectonic evolution of the Pampean Ranges started ca. 640 Ma with the deposition of supracrustal sequences in a backarc basin between a Neoproterozoic magmatic arc to the east and the Pampia terrane to the west. Ophiolite remnants of this backarc basin yielded a whole-rock isochron indicating the age of 647 ± 77 Ma (2σ) and εNd (initial time [T]) of +5.2. Sensitive high-resolution ion microprobe U-Pb data for detrital metasediments show provenance patterns with two main age populations: the older 1.1-0.9 Ga, and the younger between ca. 0.7 and 0.6 Ga. The Neoproterozoic population is relatively more abundant in sediments of the easternmost units of the Eastern Pampean Ranges and becomes less abundant toward the west. Depleted mantle ages show a similar pattern, with ages generally increasing from east (1.42 Ga) to west (1.76 Ga), suggesting the presence of Neoproterozoic sources to the east of the ranges. The provenance data do not support previous evolution models for the Eastern Pampean Ranges, according to which the supracrustal sequence represents the passive margin of the Río de la Plata craton. Early Cambrian collision and high-grade metamorphism mark the final stages of evolution of the belt and were shortly followed by calc-alkaline metaluminous and peraluminous granitic magmatism ca. 530-514 Ma. The results suggest that the geological evolution of the Eastern Pampean Ranges took place between ca. 640 and 514 Ma, coeval with other Brasiliano orogens in Brazil (e.g., the Paraguay and Araguaia fold belts).
Fil: Escayola, Monica Patricia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Pimentel, Márcio M.. Universidade do Brasília; Brasil
Fil: Armstrong, Richard. Australian National University; Australia
description The Eastern Pampean Ranges comprise high-grade supracrustal sequences with linear belts of mafic-ultramafic bodies representing ophiolite remnants. New U-Pb and Nd isotopic data suggest that the tectonic evolution of the Pampean Ranges started ca. 640 Ma with the deposition of supracrustal sequences in a backarc basin between a Neoproterozoic magmatic arc to the east and the Pampia terrane to the west. Ophiolite remnants of this backarc basin yielded a whole-rock isochron indicating the age of 647 ± 77 Ma (2σ) and εNd (initial time [T]) of +5.2. Sensitive high-resolution ion microprobe U-Pb data for detrital metasediments show provenance patterns with two main age populations: the older 1.1-0.9 Ga, and the younger between ca. 0.7 and 0.6 Ga. The Neoproterozoic population is relatively more abundant in sediments of the easternmost units of the Eastern Pampean Ranges and becomes less abundant toward the west. Depleted mantle ages show a similar pattern, with ages generally increasing from east (1.42 Ga) to west (1.76 Ga), suggesting the presence of Neoproterozoic sources to the east of the ranges. The provenance data do not support previous evolution models for the Eastern Pampean Ranges, according to which the supracrustal sequence represents the passive margin of the Río de la Plata craton. Early Cambrian collision and high-grade metamorphism mark the final stages of evolution of the belt and were shortly followed by calc-alkaline metaluminous and peraluminous granitic magmatism ca. 530-514 Ma. The results suggest that the geological evolution of the Eastern Pampean Ranges took place between ca. 640 and 514 Ma, coeval with other Brasiliano orogens in Brazil (e.g., the Paraguay and Araguaia fold belts).
publishDate 2007
dc.date.none.fl_str_mv 2007-06
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/92819
Escayola, Monica Patricia; Pimentel, Márcio M.; Armstrong, Richard; Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina; Geological Society of America; Geology; 35; 6; 6-2007; 495-498
0091-7613
CONICET Digital
CONICET
url http://hdl.handle.net/11336/92819
identifier_str_mv Escayola, Monica Patricia; Pimentel, Márcio M.; Armstrong, Richard; Neoproterozoic backarc basin: Sensitive high-resolution ion microprobe U-Pb and Sm-Nd isotopic evidence from the Eastern Pampean Ranges, Argentina; Geological Society of America; Geology; 35; 6; 6-2007; 495-498
0091-7613
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/gsa/geology/article-abstract/35/6/495/129864/Neoproterozoic-backarc-basin-Sensitive-high
info:eu-repo/semantics/altIdentifier/doi/10.1130/G23549A.1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Geological Society of America
publisher.none.fl_str_mv Geological Society of America
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.13397

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