Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics
Autor(a) principal: | |
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Data de Publicação: | 2004 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://virtualexplorer.com.au/article/2004/108/final-stages-of-the-brasiliano-orogeny http://hdl.handle.net/11449/68016 |
Resumo: | Around the southern margins of the São Francisco Craton, there is a zone of tectonic interference between the Brasília belt to the west and the younger Ribeira belt to the east. U-Pb monazite and 40Ar/39Ar cooling age determinations carried out in the area reveal the cooling histories of these belts and the timing of tectonic overprint, unraveling the final stages of Brasiliano Orogeny in SE Brazil. The U-Pb monazite data from migmatized paragneisses and late-stage pegmatites in the Socorro-Guaxupé Nappe System of the southern Brasília belt show that migmatization peaked between ca. 613±1 and 607±3 Ma. 40Ar/39Ar biotite and muscovite ages of paragneisses and schists in this area indicate that the northern high-grade core of the Nappe System (Guaxupé Domain) was uplifted and cooled through the 350°C isotherm between 599±1 and 587±1 Ma. In contrast, samples from the southern high-grade core of the Nappe System, the Socorro Domain, south of the Jacutinga shear zone, yields a broader and younger spectrum of 40Ar/39Ar biotite ages between 571±1 and 562±1 Ma, attributed to a later uplift and cooling of the crust. The cooling ages can be assigned to local resetting of the 40Ar/39Ar system during transpressive tectonic overprint due to reactivation as a result of collision of the Ribeira belt. A younger group of 40Ar/39Ar mica ages (537±1 to 521±1Ma) in schists of the Socorro Domain, are associated with transpressional structures of the Ribeira belt. Rock samples from the Jacutinga and Três Corações shear zones, yield 40Ar/39Ar biotite-muscovite ages around 520 Ma. These are typical cooling ages of the Ribeira belt, and are interpreted to mark the western limit of the Ribeira belt transpressional regime within the Brasília belt. The youngest biotite-muscovite cooling ages in schists of the Socorro Domain, between 510±2 and 491±1 Ma, mark the final cooling and exhumation of that part of the Brasília belt. |
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Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt TectonicsAr-ArBrasiliano orogenRibeira BeltTectonicsU-PbAround the southern margins of the São Francisco Craton, there is a zone of tectonic interference between the Brasília belt to the west and the younger Ribeira belt to the east. U-Pb monazite and 40Ar/39Ar cooling age determinations carried out in the area reveal the cooling histories of these belts and the timing of tectonic overprint, unraveling the final stages of Brasiliano Orogeny in SE Brazil. The U-Pb monazite data from migmatized paragneisses and late-stage pegmatites in the Socorro-Guaxupé Nappe System of the southern Brasília belt show that migmatization peaked between ca. 613±1 and 607±3 Ma. 40Ar/39Ar biotite and muscovite ages of paragneisses and schists in this area indicate that the northern high-grade core of the Nappe System (Guaxupé Domain) was uplifted and cooled through the 350°C isotherm between 599±1 and 587±1 Ma. In contrast, samples from the southern high-grade core of the Nappe System, the Socorro Domain, south of the Jacutinga shear zone, yields a broader and younger spectrum of 40Ar/39Ar biotite ages between 571±1 and 562±1 Ma, attributed to a later uplift and cooling of the crust. The cooling ages can be assigned to local resetting of the 40Ar/39Ar system during transpressive tectonic overprint due to reactivation as a result of collision of the Ribeira belt. A younger group of 40Ar/39Ar mica ages (537±1 to 521±1Ma) in schists of the Socorro Domain, are associated with transpressional structures of the Ribeira belt. Rock samples from the Jacutinga and Três Corações shear zones, yield 40Ar/39Ar biotite-muscovite ages around 520 Ma. These are typical cooling ages of the Ribeira belt, and are interpreted to mark the western limit of the Ribeira belt transpressional regime within the Brasília belt. The youngest biotite-muscovite cooling ages in schists of the Socorro Domain, between 510±2 and 491±1 Ma, mark the final cooling and exhumation of that part of the Brasília belt.Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista, Av. 24 A, 1515, Rio Claro, SP, CEP 13506-900Centro de Pesquisas Geocronológicas Instituto de Geociências Universidade de São Paulo, Rua do Lago, 562, São Paulo, SP, CEP 05508-080Instituto de Geociências Universidade Federal de Brasília, Brasília, DF, CEP 70910-900Instituto de Geociências Universidade Federal do Rio de Janeiro Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, CEP 21949-900Department of Earth Sciences University of Queensland, Brisbane, QLD 4072Instituto de Geociências e Ciências Exatas Universidade Estadual Paulista, Av. 24 A, 1515, Rio Claro, SP, CEP 13506-900Universidade Estadual Paulista (Unesp)Universidade de São Paulo (USP)Universidade de Brasília (UnB)Universidade Federal do Rio de Janeiro (UFRJ)University of QueenslandHackspacher, P. C. [UNESP]Fetter, A. H. [UNESP]Teixeira, W.Dantas, E. L.Ebert, H. D. [UNESP]Trouw, R. A. J.Vasconcelos, P.2014-05-27T11:21:13Z2014-05-27T11:21:13Z2004-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://virtualexplorer.com.au/article/2004/108/final-stages-of-the-brasiliano-orogenyJournal of the Virtual Explorer, v. 17.1441-81261441-8142http://hdl.handle.net/11449/680162-s2.0-3954911954410401359359087340000-0003-2125-3050Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Virtual Explorer0,5510,551info:eu-repo/semantics/openAccess2021-10-23T10:59:00Zoai:repositorio.unesp.br:11449/68016Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:14:18.302771Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
title |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
spellingShingle |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics Hackspacher, P. C. [UNESP] Ar-Ar Brasiliano orogen Ribeira Belt Tectonics U-Pb |
title_short |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
title_full |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
title_fullStr |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
title_full_unstemmed |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
title_sort |
Final stages of the Brasiliano Orogenesis in SE Brazil: U-Pb and 40Ar/39Ar evidence for overprinting of the Brasília Belt by the Ribeira Belt Tectonics |
author |
Hackspacher, P. C. [UNESP] |
author_facet |
Hackspacher, P. C. [UNESP] Fetter, A. H. [UNESP] Teixeira, W. Dantas, E. L. Ebert, H. D. [UNESP] Trouw, R. A. J. Vasconcelos, P. |
author_role |
author |
author2 |
Fetter, A. H. [UNESP] Teixeira, W. Dantas, E. L. Ebert, H. D. [UNESP] Trouw, R. A. J. Vasconcelos, P. |
author2_role |
author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade de São Paulo (USP) Universidade de Brasília (UnB) Universidade Federal do Rio de Janeiro (UFRJ) University of Queensland |
dc.contributor.author.fl_str_mv |
Hackspacher, P. C. [UNESP] Fetter, A. H. [UNESP] Teixeira, W. Dantas, E. L. Ebert, H. D. [UNESP] Trouw, R. A. J. Vasconcelos, P. |
dc.subject.por.fl_str_mv |
Ar-Ar Brasiliano orogen Ribeira Belt Tectonics U-Pb |
topic |
Ar-Ar Brasiliano orogen Ribeira Belt Tectonics U-Pb |
description |
Around the southern margins of the São Francisco Craton, there is a zone of tectonic interference between the Brasília belt to the west and the younger Ribeira belt to the east. U-Pb monazite and 40Ar/39Ar cooling age determinations carried out in the area reveal the cooling histories of these belts and the timing of tectonic overprint, unraveling the final stages of Brasiliano Orogeny in SE Brazil. The U-Pb monazite data from migmatized paragneisses and late-stage pegmatites in the Socorro-Guaxupé Nappe System of the southern Brasília belt show that migmatization peaked between ca. 613±1 and 607±3 Ma. 40Ar/39Ar biotite and muscovite ages of paragneisses and schists in this area indicate that the northern high-grade core of the Nappe System (Guaxupé Domain) was uplifted and cooled through the 350°C isotherm between 599±1 and 587±1 Ma. In contrast, samples from the southern high-grade core of the Nappe System, the Socorro Domain, south of the Jacutinga shear zone, yields a broader and younger spectrum of 40Ar/39Ar biotite ages between 571±1 and 562±1 Ma, attributed to a later uplift and cooling of the crust. The cooling ages can be assigned to local resetting of the 40Ar/39Ar system during transpressive tectonic overprint due to reactivation as a result of collision of the Ribeira belt. A younger group of 40Ar/39Ar mica ages (537±1 to 521±1Ma) in schists of the Socorro Domain, are associated with transpressional structures of the Ribeira belt. Rock samples from the Jacutinga and Três Corações shear zones, yield 40Ar/39Ar biotite-muscovite ages around 520 Ma. These are typical cooling ages of the Ribeira belt, and are interpreted to mark the western limit of the Ribeira belt transpressional regime within the Brasília belt. The youngest biotite-muscovite cooling ages in schists of the Socorro Domain, between 510±2 and 491±1 Ma, mark the final cooling and exhumation of that part of the Brasília belt. |
publishDate |
2004 |
dc.date.none.fl_str_mv |
2004-12-01 2014-05-27T11:21:13Z 2014-05-27T11:21:13Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://virtualexplorer.com.au/article/2004/108/final-stages-of-the-brasiliano-orogeny Journal of the Virtual Explorer, v. 17. 1441-8126 1441-8142 http://hdl.handle.net/11449/68016 2-s2.0-39549119544 1040135935908734 0000-0003-2125-3050 |
url |
http://virtualexplorer.com.au/article/2004/108/final-stages-of-the-brasiliano-orogeny http://hdl.handle.net/11449/68016 |
identifier_str_mv |
Journal of the Virtual Explorer, v. 17. 1441-8126 1441-8142 2-s2.0-39549119544 1040135935908734 0000-0003-2125-3050 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the Virtual Explorer 0,551 0,551 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129407404998656 |