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, Diego; 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 (30°56′–31°29′ S and 67°17′–67°32′ 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 °C). 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina
Fil: Arancibia, Gloria. Servicio Nacional de Geologia y Mineria (SERNAGEOMIN); Chile
Fil: Morata, Diego. Universidad de Chile; Chile
Fil: Belmar, Mauricio. Universidad de Chile; Chile
Fil: Previley, Lorena Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina
Fil: Pontoriero, Sandra Inés. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina - Materia
-
METAGABBROIC MYLONITES
P-T PATH
FAMATINIAN OROGENY
ARGENTINA
40AR 39AR DATING
SIERRA DE LA HUERTA - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/158233
Ver los metadatos del registro completo
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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, DiegoBelmar, MauricioPreviley, Lorena CristinaPontoriero, Sandra InésMETAGABBROIC MYLONITESP-T PATHFAMATINIAN OROGENYARGENTINA40AR 39AR DATINGSIERRA DE LA HUERTAhttps://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 (30°56′–31°29′ S and 67°17′–67°32′ 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 °C). 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; ArgentinaFil: Arancibia, Gloria. Servicio Nacional de Geologia y Mineria (SERNAGEOMIN); ChileFil: Morata, Diego. Universidad de Chile; ChileFil: Belmar, Mauricio. Universidad de Chile; ChileFil: Previley, Lorena Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; ArgentinaFil: Pontoriero, Sandra Inés. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; ArgentinaElsevier2008-03info: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/11336/158233Castro, Brigida Marta Ester; Arancibia, Gloria; Morata, Diego; 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; Gondwana Research; 13; 2; 3-2008; 216-2261342-937XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2007.05.005info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1342937X07000895info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:44:14Zoai:ri.conicet.gov.ar:11336/158233instacron: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 10:44:14.562CONICET 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 FAMATINIAN OROGENY ARGENTINA 40AR 39AR DATING SIERRA DE LA HUERTA |
| 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, Diego Belmar, Mauricio Previley, Lorena Cristina Pontoriero, Sandra Inés |
| author |
Castro, Brigida Marta Ester |
| author_facet |
Castro, Brigida Marta Ester Arancibia, Gloria Morata, Diego Belmar, Mauricio Previley, Lorena Cristina Pontoriero, Sandra Inés |
| author_role |
author |
| author2 |
Arancibia, Gloria Morata, Diego 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 FAMATINIAN OROGENY ARGENTINA 40AR 39AR DATING SIERRA DE LA HUERTA |
| topic |
METAGABBROIC MYLONITES P-T PATH FAMATINIAN OROGENY ARGENTINA 40AR 39AR DATING SIERRA DE LA HUERTA |
| 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 (30°56′–31°29′ S and 67°17′–67°32′ 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 °C). 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. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina Fil: Arancibia, Gloria. Servicio Nacional de Geologia y Mineria (SERNAGEOMIN); Chile Fil: Morata, Diego. Universidad de Chile; Chile Fil: Belmar, Mauricio. Universidad de Chile; Chile Fil: Previley, Lorena Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; Argentina. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; Argentina Fil: Pontoriero, Sandra Inés. Universidad Nacional de San Juan. Facultad de Ciencias Exactas, Físicas y Naturales. Instituto de Geología "Dr. Emiliano Aparicio"; 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 (30°56′–31°29′ S and 67°17′–67°32′ 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 °C). 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 |
2008-03 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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article |
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publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/158233 Castro, Brigida Marta Ester; Arancibia, Gloria; Morata, Diego; 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; Gondwana Research; 13; 2; 3-2008; 216-226 1342-937X CONICET Digital CONICET |
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http://hdl.handle.net/11336/158233 |
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Castro, Brigida Marta Ester; Arancibia, Gloria; Morata, Diego; 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; Gondwana Research; 13; 2; 3-2008; 216-226 1342-937X CONICET Digital CONICET |
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eng |
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eng |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.gr.2007.05.005 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/abs/pii/S1342937X07000895 |
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Elsevier |
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