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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/79521
Ver los metadatos del registro completo
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CONICET Digital (CONICET) |
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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 Técnicas2025-09-03T09:55:04Zoai: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:34982025-09-03 09:55:04.686CONICET 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 |
_version_ |
1842269322112663552 |
score |
13.13397 |