Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana

Autores
Robinson, Doug; Bevins, Richard E.; Rubinstein, Nora Alicia
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The metamorphic character of metabasites of the Precordillera terrane of western Argentina provides constraints which help to distinguish between contrasting models for the tectonic settings during the late stages of the accretion of this terrane onto the margin of Gondwana in late Lower Palaeozoic times. Metamorphic conditions are constrained to a low-temperature/low-pressure setting at ca. 250-350°C and 2-3 kbar, with geothermal gradients of between 30-35°C km -1 . The metamorphic character of the rocks and the derived P-T conditions demonstrate that the metamorphism did not develop in an ocean-floor setting as has been previously proposed. Neither is the metamorphic character compatible with being derived from enhanced heat flow in an extensional setting at the western edge of the Precordillera in the mid-Ordovician following docking against Gondwana. The most compatible model is one in which the metamorphism developed as a result of collision between the Chilenia and Precordillera terranes in early Devonian times. In addition, the metamorphism constrains the subduction depth to < ca. 15 km had the leading western edge of the Precordillera been subducted westwards beneath Chilenia. However, the metamorphic character is perhaps better linked to subduction of the leading edge of Chilenia eastwards against the Precordillera.
Fil: Robinson, Doug. University of Bristol; Reino Unido
Fil: Bevins, Richard E.. National Museums and Galleries of Wales; Reino Unido
Fil: Rubinstein, Nora Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Materia
Accretion
Gondwana
Laurentia
Low-Grade Metamorphism
Precordillera
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/76183
Acceder
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network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto GondwanaRobinson, DougBevins, Richard E.Rubinstein, Nora AliciaAccretionGondwanaLaurentiaLow-Grade MetamorphismPrecordillerahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The metamorphic character of metabasites of the Precordillera terrane of western Argentina provides constraints which help to distinguish between contrasting models for the tectonic settings during the late stages of the accretion of this terrane onto the margin of Gondwana in late Lower Palaeozoic times. Metamorphic conditions are constrained to a low-temperature/low-pressure setting at ca. 250-350°C and 2-3 kbar, with geothermal gradients of between 30-35°C km -1 . The metamorphic character of the rocks and the derived P-T conditions demonstrate that the metamorphism did not develop in an ocean-floor setting as has been previously proposed. Neither is the metamorphic character compatible with being derived from enhanced heat flow in an extensional setting at the western edge of the Precordillera in the mid-Ordovician following docking against Gondwana. The most compatible model is one in which the metamorphism developed as a result of collision between the Chilenia and Precordillera terranes in early Devonian times. In addition, the metamorphism constrains the subduction depth to < ca. 15 km had the leading western edge of the Precordillera been subducted westwards beneath Chilenia. However, the metamorphic character is perhaps better linked to subduction of the leading edge of Chilenia eastwards against the Precordillera.Fil: Robinson, Doug. University of Bristol; Reino UnidoFil: Bevins, Richard E.. National Museums and Galleries of Wales; Reino UnidoFil: Rubinstein, Nora Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaE Schweizerbartsche Verlags2005-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/76183Robinson, Doug; Bevins, Richard E.; Rubinstein, Nora Alicia; Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana; E Schweizerbartsche Verlags; European Journal Of Mineralogy (print); 17; 3; 5-2005; 441-4520935-1221CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.schweizerbart.de/papers/ejm/detail/17/56710/Subgreenschist_facies_metamorphism_of_metabasites_info:eu-repo/semantics/altIdentifier/doi/10.1127/0935-1221/2005/0017-0441info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:49:45Zoai:ri.conicet.gov.ar:11336/76183instacron: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 09:49:45.949CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
title Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
spellingShingle Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
Robinson, Doug
Accretion
Gondwana
Laurentia
Low-Grade Metamorphism
Precordillera
title_short Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
title_full Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
title_fullStr Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
title_full_unstemmed Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
title_sort Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana
dc.creator.none.fl_str_mv Robinson, Doug
Bevins, Richard E.
Rubinstein, Nora Alicia
author Robinson, Doug
author_facet Robinson, Doug
Bevins, Richard E.
Rubinstein, Nora Alicia
author_role author
author2 Bevins, Richard E.
Rubinstein, Nora Alicia
author2_role author
author
dc.subject.none.fl_str_mv Accretion
Gondwana
Laurentia
Low-Grade Metamorphism
Precordillera
topic Accretion
Gondwana
Laurentia
Low-Grade Metamorphism
Precordillera
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 metamorphic character of metabasites of the Precordillera terrane of western Argentina provides constraints which help to distinguish between contrasting models for the tectonic settings during the late stages of the accretion of this terrane onto the margin of Gondwana in late Lower Palaeozoic times. Metamorphic conditions are constrained to a low-temperature/low-pressure setting at ca. 250-350°C and 2-3 kbar, with geothermal gradients of between 30-35°C km -1 . The metamorphic character of the rocks and the derived P-T conditions demonstrate that the metamorphism did not develop in an ocean-floor setting as has been previously proposed. Neither is the metamorphic character compatible with being derived from enhanced heat flow in an extensional setting at the western edge of the Precordillera in the mid-Ordovician following docking against Gondwana. The most compatible model is one in which the metamorphism developed as a result of collision between the Chilenia and Precordillera terranes in early Devonian times. In addition, the metamorphism constrains the subduction depth to < ca. 15 km had the leading western edge of the Precordillera been subducted westwards beneath Chilenia. However, the metamorphic character is perhaps better linked to subduction of the leading edge of Chilenia eastwards against the Precordillera.
Fil: Robinson, Doug. University of Bristol; Reino Unido
Fil: Bevins, Richard E.. National Museums and Galleries of Wales; Reino Unido
Fil: Rubinstein, Nora Alicia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
description The metamorphic character of metabasites of the Precordillera terrane of western Argentina provides constraints which help to distinguish between contrasting models for the tectonic settings during the late stages of the accretion of this terrane onto the margin of Gondwana in late Lower Palaeozoic times. Metamorphic conditions are constrained to a low-temperature/low-pressure setting at ca. 250-350°C and 2-3 kbar, with geothermal gradients of between 30-35°C km -1 . The metamorphic character of the rocks and the derived P-T conditions demonstrate that the metamorphism did not develop in an ocean-floor setting as has been previously proposed. Neither is the metamorphic character compatible with being derived from enhanced heat flow in an extensional setting at the western edge of the Precordillera in the mid-Ordovician following docking against Gondwana. The most compatible model is one in which the metamorphism developed as a result of collision between the Chilenia and Precordillera terranes in early Devonian times. In addition, the metamorphism constrains the subduction depth to < ca. 15 km had the leading western edge of the Precordillera been subducted westwards beneath Chilenia. However, the metamorphic character is perhaps better linked to subduction of the leading edge of Chilenia eastwards against the Precordillera.
publishDate 2005
dc.date.none.fl_str_mv 2005-05
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/11336/76183
Robinson, Doug; Bevins, Richard E.; Rubinstein, Nora Alicia; Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana; E Schweizerbartsche Verlags; European Journal Of Mineralogy (print); 17; 3; 5-2005; 441-452
0935-1221
CONICET Digital
CONICET
url http://hdl.handle.net/11336/76183
identifier_str_mv Robinson, Doug; Bevins, Richard E.; Rubinstein, Nora Alicia; Subgreenschist facies metamorphism of metabasites from the Precordillera terrane of western Argentina; constraints on the later stages of accretion onto Gondwana; E Schweizerbartsche Verlags; European Journal Of Mineralogy (print); 17; 3; 5-2005; 441-452
0935-1221
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://www.schweizerbart.de/papers/ejm/detail/17/56710/Subgreenschist_facies_metamorphism_of_metabasites_
info:eu-repo/semantics/altIdentifier/doi/10.1127/0935-1221/2005/0017-0441
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv E Schweizerbartsche Verlags
publisher.none.fl_str_mv E Schweizerbartsche Verlags
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
_version_ 1842268992592412672
score 13.13397

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