Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina

Autores
Hongn, Fernando Daniel; Riller, Ulrich
Año de publicación
2007
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The Cerro Durazno, Brealito, and Cobres granitoid plutons belong to the eastern Ordovician magmatic belt of northwestArgentina and are associated with a network of NW- and N-striking ductile shear zones. A structural analysisof these plutons and their metamorphic host rocks was conducted to elucidate mid- to upper-crustal magmatism andtectonism at the western margin of Gondwana. Pluton emplacement took place at 480?455 Ma, toward the end ofa ca. 75-Ma-long episode of regional deformation and high-temperature metamorphism. The Cerro Durazno andBrealito plutons were probably emplaced as NE-SW-striking, vertical magma sheets that coalesced into large magmabodies under overall E-W shortening that generated SW-dipping metamorphic foliations at a later stage of plutonformation. These fabrics were superimposed to the magmatic structures in the granite plutons and to the high-grademetamorphic structures of the host rocks. At the northern pluton margins, ductile high-strain zones, notably theAgua Rosada Shear Zone north of the Cerro Durazno pluton, further localized ascent of granitoid magma. Similarly,emplacement of the Brealito and Cobres plutons is genetically related to prominent shear zones. Geometry andmetamorphic character of the shear zone network in the eastern Ordovician magmatic belt point to orogen-parallelextension and transverse shortening of the belt under variable metamorphic conditions. The width as well as protracteddeformation, high-temperature metamorphism, anatexis, and granitoid magmatism of the magmatic belt are keycharacteristics of a hot, wide orogen that evolved during the lower Paleozoic at the western margin of Gondwana.Remarkable geotectonic similarities with respect to the modern Andes point to comparable plate-tectonic conditionsat the lower Paleozoic and the Cenozoic convergent plate margins.
Fil: Hongn, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina
Fil: Riller, Ulrich. Universität zu Berlin; Alemania
Materia
CERRO DURAZNO PLUTON
EMPLACEMENT
DEFORMATION
NW 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:11336/55132
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest ArgentinaHongn, Fernando DanielRiller, UlrichCERRO DURAZNO PLUTONEMPLACEMENTDEFORMATIONNW ARGENTINAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Cerro Durazno, Brealito, and Cobres granitoid plutons belong to the eastern Ordovician magmatic belt of northwestArgentina and are associated with a network of NW- and N-striking ductile shear zones. A structural analysisof these plutons and their metamorphic host rocks was conducted to elucidate mid- to upper-crustal magmatism andtectonism at the western margin of Gondwana. Pluton emplacement took place at 480?455 Ma, toward the end ofa ca. 75-Ma-long episode of regional deformation and high-temperature metamorphism. The Cerro Durazno andBrealito plutons were probably emplaced as NE-SW-striking, vertical magma sheets that coalesced into large magmabodies under overall E-W shortening that generated SW-dipping metamorphic foliations at a later stage of plutonformation. These fabrics were superimposed to the magmatic structures in the granite plutons and to the high-grademetamorphic structures of the host rocks. At the northern pluton margins, ductile high-strain zones, notably theAgua Rosada Shear Zone north of the Cerro Durazno pluton, further localized ascent of granitoid magma. Similarly,emplacement of the Brealito and Cobres plutons is genetically related to prominent shear zones. Geometry andmetamorphic character of the shear zone network in the eastern Ordovician magmatic belt point to orogen-parallelextension and transverse shortening of the belt under variable metamorphic conditions. The width as well as protracteddeformation, high-temperature metamorphism, anatexis, and granitoid magmatism of the magmatic belt are keycharacteristics of a hot, wide orogen that evolved during the lower Paleozoic at the western margin of Gondwana.Remarkable geotectonic similarities with respect to the modern Andes point to comparable plate-tectonic conditionsat the lower Paleozoic and the Cenozoic convergent plate margins.Fil: Hongn, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; ArgentinaFil: Riller, Ulrich. Universität zu Berlin; AlemaniaUniversity of Chicago Press2007-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/55132Hongn, Fernando Daniel; Riller, Ulrich; Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina; University of Chicago Press; Journal Of Geology; 115; 2; 3-2007; 163-1800022-1376CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1086/510644info:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/abs/10.1086/510644info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:59:36Zoai:ri.conicet.gov.ar:11336/55132instacron: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 09:59:36.364CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
title Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
spellingShingle Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
Hongn, Fernando Daniel
CERRO DURAZNO PLUTON
EMPLACEMENT
DEFORMATION
NW ARGENTINA
title_short Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
title_full Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
title_fullStr Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
title_full_unstemmed Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
title_sort Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina
dc.creator.none.fl_str_mv Hongn, Fernando Daniel
Riller, Ulrich
author Hongn, Fernando Daniel
author_facet Hongn, Fernando Daniel
Riller, Ulrich
author_role author
author2 Riller, Ulrich
author2_role author
dc.subject.none.fl_str_mv CERRO DURAZNO PLUTON
EMPLACEMENT
DEFORMATION
NW ARGENTINA
topic CERRO DURAZNO PLUTON
EMPLACEMENT
DEFORMATION
NW 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 Cerro Durazno, Brealito, and Cobres granitoid plutons belong to the eastern Ordovician magmatic belt of northwestArgentina and are associated with a network of NW- and N-striking ductile shear zones. A structural analysisof these plutons and their metamorphic host rocks was conducted to elucidate mid- to upper-crustal magmatism andtectonism at the western margin of Gondwana. Pluton emplacement took place at 480?455 Ma, toward the end ofa ca. 75-Ma-long episode of regional deformation and high-temperature metamorphism. The Cerro Durazno andBrealito plutons were probably emplaced as NE-SW-striking, vertical magma sheets that coalesced into large magmabodies under overall E-W shortening that generated SW-dipping metamorphic foliations at a later stage of plutonformation. These fabrics were superimposed to the magmatic structures in the granite plutons and to the high-grademetamorphic structures of the host rocks. At the northern pluton margins, ductile high-strain zones, notably theAgua Rosada Shear Zone north of the Cerro Durazno pluton, further localized ascent of granitoid magma. Similarly,emplacement of the Brealito and Cobres plutons is genetically related to prominent shear zones. Geometry andmetamorphic character of the shear zone network in the eastern Ordovician magmatic belt point to orogen-parallelextension and transverse shortening of the belt under variable metamorphic conditions. The width as well as protracteddeformation, high-temperature metamorphism, anatexis, and granitoid magmatism of the magmatic belt are keycharacteristics of a hot, wide orogen that evolved during the lower Paleozoic at the western margin of Gondwana.Remarkable geotectonic similarities with respect to the modern Andes point to comparable plate-tectonic conditionsat the lower Paleozoic and the Cenozoic convergent plate margins.
Fil: Hongn, Fernando Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Bio y Geociencias del NOA. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Museo de Ciencias Naturales. Instituto de Bio y Geociencias del NOA; Argentina
Fil: Riller, Ulrich. Universität zu Berlin; Alemania
description The Cerro Durazno, Brealito, and Cobres granitoid plutons belong to the eastern Ordovician magmatic belt of northwestArgentina and are associated with a network of NW- and N-striking ductile shear zones. A structural analysisof these plutons and their metamorphic host rocks was conducted to elucidate mid- to upper-crustal magmatism andtectonism at the western margin of Gondwana. Pluton emplacement took place at 480?455 Ma, toward the end ofa ca. 75-Ma-long episode of regional deformation and high-temperature metamorphism. The Cerro Durazno andBrealito plutons were probably emplaced as NE-SW-striking, vertical magma sheets that coalesced into large magmabodies under overall E-W shortening that generated SW-dipping metamorphic foliations at a later stage of plutonformation. These fabrics were superimposed to the magmatic structures in the granite plutons and to the high-grademetamorphic structures of the host rocks. At the northern pluton margins, ductile high-strain zones, notably theAgua Rosada Shear Zone north of the Cerro Durazno pluton, further localized ascent of granitoid magma. Similarly,emplacement of the Brealito and Cobres plutons is genetically related to prominent shear zones. Geometry andmetamorphic character of the shear zone network in the eastern Ordovician magmatic belt point to orogen-parallelextension and transverse shortening of the belt under variable metamorphic conditions. The width as well as protracteddeformation, high-temperature metamorphism, anatexis, and granitoid magmatism of the magmatic belt are keycharacteristics of a hot, wide orogen that evolved during the lower Paleozoic at the western margin of Gondwana.Remarkable geotectonic similarities with respect to the modern Andes point to comparable plate-tectonic conditionsat the lower Paleozoic and the Cenozoic convergent plate margins.
publishDate 2007
dc.date.none.fl_str_mv 2007-03
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/11336/55132
Hongn, Fernando Daniel; Riller, Ulrich; Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina; University of Chicago Press; Journal Of Geology; 115; 2; 3-2007; 163-180
0022-1376
CONICET Digital
CONICET
url http://hdl.handle.net/11336/55132
identifier_str_mv Hongn, Fernando Daniel; Riller, Ulrich; Tectonic evolution of the western margin of Gondwana inferred from syntectonic emplacement of Paleozoic granitoid plutons in northwest Argentina; University of Chicago Press; Journal Of Geology; 115; 2; 3-2007; 163-180
0022-1376
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1086/510644
info:eu-repo/semantics/altIdentifier/url/https://www.journals.uchicago.edu/doi/abs/10.1086/510644
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
dc.publisher.none.fl_str_mv University of Chicago Press
publisher.none.fl_str_mv University of Chicago Press
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 13.13397

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