MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional corr...

Autores
Urraza, Ivana Alejandra; Delpino, Sergio Hugo; Grecco, Laura Edith
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Amphibolites included in the metapelitic sequence and as xenoliths in intrusive magmatic rocks outcropping in the southern sector of the Aluminé Igneous-Metamorphic Complex (AIMC), Neuquén, Argentina, are studied in detail in order to determine their origin and their subsequent metamorphic evolution. Field evidence and whole-rock geochemistry indicate that these rocks were derived from a Mid-Ocean Ridge Basalt (MORB)-type protolith, and were accreted as tectonic slices into the metapelitic sequence that mainly formed the basal accretionary prism associated with a pre-Andean SW-NE subduction setting. Phase relationships, geochemistry of mineral assemblages and geothermobarometry indicate the presence of at least two metamorphic events (M1 1.9-3.9kbar, 677-745ºC and M2 6.4kbar, 723ºC) framed in a counterclockwise P-T path, comparable to those previously determined for the metapelitic country-rocks and metatroctolites outcropping in the same sector of the AIMC. Based on regional correlations and the agreement in the petrological, geochemical, geochronological and structural characteristics, we suggest that the MORB-derived Ñorquinco amphibolites and neighboring aluminous metasedimentary basement rocks of the AIMC belong to the eastern prolongation of the Western Series of the Coastal Accretionary Complex of Central Chile in west-central Argentina territory.
Fil: Urraza, Ivana Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Delpino, Sergio Hugo. Universidad Nacional del Sur. Departamento de Geología; Argentina
Fil: Grecco, Laura Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Materia
ACCRETIONARY PRISM
AMPHIBOLITES
LATE PALEOZOIC
MORB
P-T PATH
THERMOBAROMETRY
TRIASSIC
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/100169
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/100169
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlationsUrraza, Ivana AlejandraDelpino, Sergio HugoGrecco, Laura EdithACCRETIONARY PRISMAMPHIBOLITESLATE PALEOZOICMORBP-T PATHTHERMOBAROMETRYTRIASSIChttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Amphibolites included in the metapelitic sequence and as xenoliths in intrusive magmatic rocks outcropping in the southern sector of the Aluminé Igneous-Metamorphic Complex (AIMC), Neuquén, Argentina, are studied in detail in order to determine their origin and their subsequent metamorphic evolution. Field evidence and whole-rock geochemistry indicate that these rocks were derived from a Mid-Ocean Ridge Basalt (MORB)-type protolith, and were accreted as tectonic slices into the metapelitic sequence that mainly formed the basal accretionary prism associated with a pre-Andean SW-NE subduction setting. Phase relationships, geochemistry of mineral assemblages and geothermobarometry indicate the presence of at least two metamorphic events (M1 1.9-3.9kbar, 677-745ºC and M2 6.4kbar, 723ºC) framed in a counterclockwise P-T path, comparable to those previously determined for the metapelitic country-rocks and metatroctolites outcropping in the same sector of the AIMC. Based on regional correlations and the agreement in the petrological, geochemical, geochronological and structural characteristics, we suggest that the MORB-derived Ñorquinco amphibolites and neighboring aluminous metasedimentary basement rocks of the AIMC belong to the eastern prolongation of the Western Series of the Coastal Accretionary Complex of Central Chile in west-central Argentina territory.Fil: Urraza, Ivana Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Delpino, Sergio Hugo. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Grecco, Laura Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaUniversidad de Barcelona2019-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdfhttp://hdl.handle.net/11336/100169Urraza, Ivana Alejandra; Delpino, Sergio Hugo; Grecco, Laura Edith; MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations; Universidad de Barcelona; Geologica Acta; 17; 10; 11-2019; 1-241695-6133CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1344/GeologicaActa2019.17.10info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2019.17.10info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:36:31Zoai:ri.conicet.gov.ar:11336/100169instacron: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 09:36:32.17CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
title MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
spellingShingle MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
Urraza, Ivana Alejandra
ACCRETIONARY PRISM
AMPHIBOLITES
LATE PALEOZOIC
MORB
P-T PATH
THERMOBAROMETRY
TRIASSIC
title_short MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
title_full MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
title_fullStr MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
title_full_unstemmed MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
title_sort MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations
dc.creator.none.fl_str_mv Urraza, Ivana Alejandra
Delpino, Sergio Hugo
Grecco, Laura Edith
author Urraza, Ivana Alejandra
author_facet Urraza, Ivana Alejandra
Delpino, Sergio Hugo
Grecco, Laura Edith
author_role author
author2 Delpino, Sergio Hugo
Grecco, Laura Edith
author2_role author
author
dc.subject.none.fl_str_mv ACCRETIONARY PRISM
AMPHIBOLITES
LATE PALEOZOIC
MORB
P-T PATH
THERMOBAROMETRY
TRIASSIC
topic ACCRETIONARY PRISM
AMPHIBOLITES
LATE PALEOZOIC
MORB
P-T PATH
THERMOBAROMETRY
TRIASSIC
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Amphibolites included in the metapelitic sequence and as xenoliths in intrusive magmatic rocks outcropping in the southern sector of the Aluminé Igneous-Metamorphic Complex (AIMC), Neuquén, Argentina, are studied in detail in order to determine their origin and their subsequent metamorphic evolution. Field evidence and whole-rock geochemistry indicate that these rocks were derived from a Mid-Ocean Ridge Basalt (MORB)-type protolith, and were accreted as tectonic slices into the metapelitic sequence that mainly formed the basal accretionary prism associated with a pre-Andean SW-NE subduction setting. Phase relationships, geochemistry of mineral assemblages and geothermobarometry indicate the presence of at least two metamorphic events (M1 1.9-3.9kbar, 677-745ºC and M2 6.4kbar, 723ºC) framed in a counterclockwise P-T path, comparable to those previously determined for the metapelitic country-rocks and metatroctolites outcropping in the same sector of the AIMC. Based on regional correlations and the agreement in the petrological, geochemical, geochronological and structural characteristics, we suggest that the MORB-derived Ñorquinco amphibolites and neighboring aluminous metasedimentary basement rocks of the AIMC belong to the eastern prolongation of the Western Series of the Coastal Accretionary Complex of Central Chile in west-central Argentina territory.
Fil: Urraza, Ivana Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Delpino, Sergio Hugo. Universidad Nacional del Sur. Departamento de Geología; Argentina
Fil: Grecco, Laura Edith. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
description Amphibolites included in the metapelitic sequence and as xenoliths in intrusive magmatic rocks outcropping in the southern sector of the Aluminé Igneous-Metamorphic Complex (AIMC), Neuquén, Argentina, are studied in detail in order to determine their origin and their subsequent metamorphic evolution. Field evidence and whole-rock geochemistry indicate that these rocks were derived from a Mid-Ocean Ridge Basalt (MORB)-type protolith, and were accreted as tectonic slices into the metapelitic sequence that mainly formed the basal accretionary prism associated with a pre-Andean SW-NE subduction setting. Phase relationships, geochemistry of mineral assemblages and geothermobarometry indicate the presence of at least two metamorphic events (M1 1.9-3.9kbar, 677-745ºC and M2 6.4kbar, 723ºC) framed in a counterclockwise P-T path, comparable to those previously determined for the metapelitic country-rocks and metatroctolites outcropping in the same sector of the AIMC. Based on regional correlations and the agreement in the petrological, geochemical, geochronological and structural characteristics, we suggest that the MORB-derived Ñorquinco amphibolites and neighboring aluminous metasedimentary basement rocks of the AIMC belong to the eastern prolongation of the Western Series of the Coastal Accretionary Complex of Central Chile in west-central Argentina territory.
publishDate 2019
dc.date.none.fl_str_mv 2019-11
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/11336/100169
Urraza, Ivana Alejandra; Delpino, Sergio Hugo; Grecco, Laura Edith; MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations; Universidad de Barcelona; Geologica Acta; 17; 10; 11-2019; 1-24
1695-6133
CONICET Digital
CONICET
url http://hdl.handle.net/11336/100169
identifier_str_mv Urraza, Ivana Alejandra; Delpino, Sergio Hugo; Grecco, Laura Edith; MORB-derived amphibolites in the paleozoic basement of the aluminé igneous-metamorphic complex, Neuquén, Argentina: Decoding its genesis, P-T evolution and pre-andean regional correlations; Universidad de Barcelona; Geologica Acta; 17; 10; 11-2019; 1-24
1695-6133
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1344/GeologicaActa2019.17.10
info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2019.17.10
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/vnd.openxmlformats-officedocument.wordprocessingml.document
application/pdf
dc.publisher.none.fl_str_mv Universidad de Barcelona
publisher.none.fl_str_mv Universidad de Barcelona
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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