P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margi...

Autores
Castro, Brigida Marta Ester; Arancibia, Gloria; Morata Cespedes, Diego Antonio; Belmar, Mauricio; Previley, Lorena Cristina; Pontoriero, Sandra Inés
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The geodynamic evolution of the proto-Andean margin of Gondwana during the Paleozoic was characterized by repeated subduction processes associated with the docking of several terranes, including the Cuyania-Precordillera terrane and the Chilenia terrane, and the development of the calc-alkaline Famatinian continental magmatic arc. In the Sierra de La Huerta (30º56' - 31º29' S and 67º17' - 67º32' W), at the southwestern end of the Western Sierras Pampeanas, some mafic to ultramafic igneous bodies belonging to the Famatinian arc were affected by regional metamorphism of the medium-pressure granulite facies (7-7.5 kbar, ≈ 850 ºC). After this regional metamorphism, local mylonitization under amphibolite facies along discrete NW-SE to NNW-SSE striking ductile shear zones occurred. A 40Ar/39Ar plateau age of 432 ± 4 Ma was obtained on rather homogeneous hornblende porphyroclasts from a metagabbro mylonite. The textures and mineral chemistry of the mylonitized metagabbro allow its P-T-t evolution from magmatic crystallization to mylonitization to be constrained. Geochronological data obtained from mylonite provide evidence that orogenesis was active at least until the Early Silurian. This deformational event would have been related to uplift and decompression during the later stages of the orogenesis, probably associated with the accretion of the Precordillera terrane to the southwestern Gondwana margin.
Fil: Castro, Brigida Marta Ester. Universidad Nacional de San Juan; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Arancibia, Gloria. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Laboratorio Servicio Nacional de Geología y Minería,; Chile
Fil: Morata Cespedes, Diego Antonio. Universidad Católica de Chile; Chile
Fil: Belmar, Mauricio. Universidad de Chile. Facultad de Ciencias Fisicas y Matematicas; Chile
Fil: Previley, Lorena Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Pontoriero, Sandra Inés. Universidad Nacional de San Juan; Argentina
Materia
Metagabbroic Mylonites
P-T Path
40ar/39ar Dating
Sierra de La Huerta
Famatinian Orogeny
Argentina
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:11336/79521
Acceder
id CONICETDig_925f65fac152afcb02342ddf90f38729
oai_identifier_str oai:ri.conicet.gov.ar:11336/79521
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana marginCastro, Brigida Marta EsterArancibia, GloriaMorata Cespedes, Diego AntonioBelmar, MauricioPreviley, Lorena CristinaPontoriero, Sandra InésMetagabbroic MylonitesP-T Path40ar/39ar DatingSierra de La HuertaFamatinian OrogenyArgentinahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The geodynamic evolution of the proto-Andean margin of Gondwana during the Paleozoic was characterized by repeated subduction processes associated with the docking of several terranes, including the Cuyania-Precordillera terrane and the Chilenia terrane, and the development of the calc-alkaline Famatinian continental magmatic arc. In the Sierra de La Huerta (30º56' - 31º29' S and 67º17' - 67º32' W), at the southwestern end of the Western Sierras Pampeanas, some mafic to ultramafic igneous bodies belonging to the Famatinian arc were affected by regional metamorphism of the medium-pressure granulite facies (7-7.5 kbar, ≈ 850 ºC). After this regional metamorphism, local mylonitization under amphibolite facies along discrete NW-SE to NNW-SSE striking ductile shear zones occurred. A 40Ar/39Ar plateau age of 432 ± 4 Ma was obtained on rather homogeneous hornblende porphyroclasts from a metagabbro mylonite. The textures and mineral chemistry of the mylonitized metagabbro allow its P-T-t evolution from magmatic crystallization to mylonitization to be constrained. Geochronological data obtained from mylonite provide evidence that orogenesis was active at least until the Early Silurian. This deformational event would have been related to uplift and decompression during the later stages of the orogenesis, probably associated with the accretion of the Precordillera terrane to the southwestern Gondwana margin.Fil: Castro, Brigida Marta Ester. Universidad Nacional de San Juan; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Arancibia, Gloria. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Laboratorio Servicio Nacional de Geología y Minería,; ChileFil: Morata Cespedes, Diego Antonio. Universidad Católica de Chile; ChileFil: Belmar, Mauricio. Universidad de Chile. Facultad de Ciencias Fisicas y Matematicas; ChileFil: Previley, Lorena Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Pontoriero, Sandra Inés. Universidad Nacional de San Juan; ArgentinaElsevier Science2008-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/79521Castro, Brigida Marta Ester; Arancibia, Gloria; Morata Cespedes, Diego Antonio; Belmar, Mauricio; Previley, Lorena Cristina; et al.; P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin; Elsevier Science; Gondwana Research; 13; 2; 12-2008; 216-2261342-937XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S1342937X07000895?via%3Dihubinfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2007.05.005info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:57:03Zoai:ri.conicet.gov.ar:11336/79521instacron: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:34982025-09-29 09:57:03.92CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
title P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
spellingShingle P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
Castro, Brigida Marta Ester
Metagabbroic Mylonites
P-T Path
40ar/39ar Dating
Sierra de La Huerta
Famatinian Orogeny
Argentina
title_short P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
title_full P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
title_fullStr P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
title_full_unstemmed P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
title_sort P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin
dc.creator.none.fl_str_mv Castro, Brigida Marta Ester
Arancibia, Gloria
Morata Cespedes, Diego Antonio
Belmar, Mauricio
Previley, Lorena Cristina
Pontoriero, Sandra Inés
author Castro, Brigida Marta Ester
author_facet Castro, Brigida Marta Ester
Arancibia, Gloria
Morata Cespedes, Diego Antonio
Belmar, Mauricio
Previley, Lorena Cristina
Pontoriero, Sandra Inés
author_role author
author2 Arancibia, Gloria
Morata Cespedes, Diego Antonio
Belmar, Mauricio
Previley, Lorena Cristina
Pontoriero, Sandra Inés
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Metagabbroic Mylonites
P-T Path
40ar/39ar Dating
Sierra de La Huerta
Famatinian Orogeny
Argentina
topic Metagabbroic Mylonites
P-T Path
40ar/39ar Dating
Sierra de La Huerta
Famatinian Orogeny
Argentina
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 geodynamic evolution of the proto-Andean margin of Gondwana during the Paleozoic was characterized by repeated subduction processes associated with the docking of several terranes, including the Cuyania-Precordillera terrane and the Chilenia terrane, and the development of the calc-alkaline Famatinian continental magmatic arc. In the Sierra de La Huerta (30º56' - 31º29' S and 67º17' - 67º32' W), at the southwestern end of the Western Sierras Pampeanas, some mafic to ultramafic igneous bodies belonging to the Famatinian arc were affected by regional metamorphism of the medium-pressure granulite facies (7-7.5 kbar, ≈ 850 ºC). After this regional metamorphism, local mylonitization under amphibolite facies along discrete NW-SE to NNW-SSE striking ductile shear zones occurred. A 40Ar/39Ar plateau age of 432 ± 4 Ma was obtained on rather homogeneous hornblende porphyroclasts from a metagabbro mylonite. The textures and mineral chemistry of the mylonitized metagabbro allow its P-T-t evolution from magmatic crystallization to mylonitization to be constrained. Geochronological data obtained from mylonite provide evidence that orogenesis was active at least until the Early Silurian. This deformational event would have been related to uplift and decompression during the later stages of the orogenesis, probably associated with the accretion of the Precordillera terrane to the southwestern Gondwana margin.
Fil: Castro, Brigida Marta Ester. Universidad Nacional de San Juan; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Arancibia, Gloria. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina. Laboratorio Servicio Nacional de Geología y Minería,; Chile
Fil: Morata Cespedes, Diego Antonio. Universidad Católica de Chile; Chile
Fil: Belmar, Mauricio. Universidad de Chile. Facultad de Ciencias Fisicas y Matematicas; Chile
Fil: Previley, Lorena Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina
Fil: Pontoriero, Sandra Inés. Universidad Nacional de San Juan; Argentina
description The geodynamic evolution of the proto-Andean margin of Gondwana during the Paleozoic was characterized by repeated subduction processes associated with the docking of several terranes, including the Cuyania-Precordillera terrane and the Chilenia terrane, and the development of the calc-alkaline Famatinian continental magmatic arc. In the Sierra de La Huerta (30º56' - 31º29' S and 67º17' - 67º32' W), at the southwestern end of the Western Sierras Pampeanas, some mafic to ultramafic igneous bodies belonging to the Famatinian arc were affected by regional metamorphism of the medium-pressure granulite facies (7-7.5 kbar, ≈ 850 ºC). After this regional metamorphism, local mylonitization under amphibolite facies along discrete NW-SE to NNW-SSE striking ductile shear zones occurred. A 40Ar/39Ar plateau age of 432 ± 4 Ma was obtained on rather homogeneous hornblende porphyroclasts from a metagabbro mylonite. The textures and mineral chemistry of the mylonitized metagabbro allow its P-T-t evolution from magmatic crystallization to mylonitization to be constrained. Geochronological data obtained from mylonite provide evidence that orogenesis was active at least until the Early Silurian. This deformational event would have been related to uplift and decompression during the later stages of the orogenesis, probably associated with the accretion of the Precordillera terrane to the southwestern Gondwana margin.
publishDate 2008
dc.date.none.fl_str_mv 2008-12
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/11336/79521
Castro, Brigida Marta Ester; Arancibia, Gloria; Morata Cespedes, Diego Antonio; Belmar, Mauricio; Previley, Lorena Cristina; et al.; P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin; Elsevier Science; Gondwana Research; 13; 2; 12-2008; 216-226
1342-937X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/79521
identifier_str_mv Castro, Brigida Marta Ester; Arancibia, Gloria; Morata Cespedes, Diego Antonio; Belmar, Mauricio; Previley, Lorena Cristina; et al.; P-T-t evolution of an Early Silurian medium-grade shear zone on the west side of the Famatinian magmatic arc, Argentina: implications for the assembly of the Western Gondwana margin; Elsevier Science; Gondwana Research; 13; 2; 12-2008; 216-226
1342-937X
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.sciencedirect.com/science/article/pii/S1342937X07000895?via%3Dihub
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2007.05.005
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
application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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 13.070432

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