Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais)
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.5327/S1519-874X2006000200005 http://hdl.handle.net/11449/68966 |
Resumo: | The Brasilia Fold Thrust Belt at Tapira area (SW of Minas Gerais State, Brazil) has four different litho-tectonic domains imbricated by thrust faults with vergency to the São Francisco Craton. Sm/Nd isotopic studies were undertaken and the results show different model and metamorphic ages for the thrust sheets. Rocks from the lower thrust sheet yield a metamorphic age of 543 Ma while the upper thrust sheet has a metamorphic age of 581 Ma. The TDM model ages are similar for both thrust sheets, between 1.7 and 2.2 Ga. Because of their lithologic characteristics, the thrust sheets are interpreted as having been deposited in a distal continental platform environment, their main source being Paleoproterozoic rocks of the São Francisco Craton. The upper thrust sheet rocks presents a metamorphism age of 612 Ma and a bimodal distribution of TDM model ages between 1.3 and 1.9 - 2.0 Ga, respectively. The lithologic and isotopic characteristics of this thrust sheet the rocks are interpreted as a result of deposition on a continental slope or oceanic floor environment, with mixed contributions from Paleo - and Mesoproterozoic rocks of the São Francisco Craton. In spite of the small number of analyzed samples and the uncertainties inherent to the Sm/Nd method the metamorphisms are not considered to be synchronous in the different thrust sheets. This is to be expected in a thrust belt system, in which the more metamorphosed thrust sheets are juxtaposed to less metamorphosed ones. |
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Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais)Origin and metamorphic ages of the rocks of the Brazilia Fold Thrust Belt in the Tapira area (SW of Minas Gerais)Araxá GroupBrasília BeltCanastra GroupSm/Nd agesevolutionlithologymetamorphic rockProterozoicthrust faultBrazilMinas GeraisSao Francisco CratonSouth AmericaCanastraThe Brasilia Fold Thrust Belt at Tapira area (SW of Minas Gerais State, Brazil) has four different litho-tectonic domains imbricated by thrust faults with vergency to the São Francisco Craton. Sm/Nd isotopic studies were undertaken and the results show different model and metamorphic ages for the thrust sheets. Rocks from the lower thrust sheet yield a metamorphic age of 543 Ma while the upper thrust sheet has a metamorphic age of 581 Ma. The TDM model ages are similar for both thrust sheets, between 1.7 and 2.2 Ga. Because of their lithologic characteristics, the thrust sheets are interpreted as having been deposited in a distal continental platform environment, their main source being Paleoproterozoic rocks of the São Francisco Craton. The upper thrust sheet rocks presents a metamorphism age of 612 Ma and a bimodal distribution of TDM model ages between 1.3 and 1.9 - 2.0 Ga, respectively. The lithologic and isotopic characteristics of this thrust sheet the rocks are interpreted as a result of deposition on a continental slope or oceanic floor environment, with mixed contributions from Paleo - and Mesoproterozoic rocks of the São Francisco Craton. In spite of the small number of analyzed samples and the uncertainties inherent to the Sm/Nd method the metamorphisms are not considered to be synchronous in the different thrust sheets. This is to be expected in a thrust belt system, in which the more metamorphosed thrust sheets are juxtaposed to less metamorphosed ones.Departamento de Geologia Geral Institute de Ciências Exatas e da Terra UFMT, Av. Fernando Corrêa s/n, CEP 78060-900, Cuiabá, MTDepartamento de Petrologia e Metalogenia IGCE UNESP, Rio Claro, SPLaboratório de Geologia Isotópica Centro de Geociências e Ciências Exatas UFPA, Belém, PADepartamento de Petrologia e Metalogenia IGCE UNESP, Rio Claro, SPUniversidade Federal de Mato Grosso (UFMT)Universidade Estadual Paulista (Unesp)Universidade Federal do Pará (UFPA)Da Silva, Carlos HumbertoSimões, Luiz Sergio Amarante [UNESP]Krymsky, RobertMacambira, Moacyr José Buenano2014-05-27T11:21:54Z2014-05-27T11:21:54Z2006-07-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article53-66application/pdfhttp://dx.doi.org/10.5327/S1519-874X2006000200005Geologia USP - Serie Cientifica, v. 6, n. 1, p. 53-66, 2006.1519-874Xhttp://hdl.handle.net/11449/6896610.5327/S1519-874X2006000200005S1519-874X20060002000052-s2.0-337498249542-s2.0-33749824954.pdf5234660343892450Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporGeologia USP: Serie Cientificainfo:eu-repo/semantics/openAccess2023-12-26T06:15:26Zoai:repositorio.unesp.br:11449/68966Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-12-26T06:15:26Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) Origin and metamorphic ages of the rocks of the Brazilia Fold Thrust Belt in the Tapira area (SW of Minas Gerais) |
title |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) |
spellingShingle |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) Da Silva, Carlos Humberto Araxá Group Brasília Belt Canastra Group Sm/Nd ages evolution lithology metamorphic rock Proterozoic thrust fault Brazil Minas Gerais Sao Francisco Craton South America Canastra |
title_short |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) |
title_full |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) |
title_fullStr |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) |
title_full_unstemmed |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) |
title_sort |
Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais) |
author |
Da Silva, Carlos Humberto |
author_facet |
Da Silva, Carlos Humberto Simões, Luiz Sergio Amarante [UNESP] Krymsky, Robert Macambira, Moacyr José Buenano |
author_role |
author |
author2 |
Simões, Luiz Sergio Amarante [UNESP] Krymsky, Robert Macambira, Moacyr José Buenano |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal de Mato Grosso (UFMT) Universidade Estadual Paulista (Unesp) Universidade Federal do Pará (UFPA) |
dc.contributor.author.fl_str_mv |
Da Silva, Carlos Humberto Simões, Luiz Sergio Amarante [UNESP] Krymsky, Robert Macambira, Moacyr José Buenano |
dc.subject.por.fl_str_mv |
Araxá Group Brasília Belt Canastra Group Sm/Nd ages evolution lithology metamorphic rock Proterozoic thrust fault Brazil Minas Gerais Sao Francisco Craton South America Canastra |
topic |
Araxá Group Brasília Belt Canastra Group Sm/Nd ages evolution lithology metamorphic rock Proterozoic thrust fault Brazil Minas Gerais Sao Francisco Craton South America Canastra |
description |
The Brasilia Fold Thrust Belt at Tapira area (SW of Minas Gerais State, Brazil) has four different litho-tectonic domains imbricated by thrust faults with vergency to the São Francisco Craton. Sm/Nd isotopic studies were undertaken and the results show different model and metamorphic ages for the thrust sheets. Rocks from the lower thrust sheet yield a metamorphic age of 543 Ma while the upper thrust sheet has a metamorphic age of 581 Ma. The TDM model ages are similar for both thrust sheets, between 1.7 and 2.2 Ga. Because of their lithologic characteristics, the thrust sheets are interpreted as having been deposited in a distal continental platform environment, their main source being Paleoproterozoic rocks of the São Francisco Craton. The upper thrust sheet rocks presents a metamorphism age of 612 Ma and a bimodal distribution of TDM model ages between 1.3 and 1.9 - 2.0 Ga, respectively. The lithologic and isotopic characteristics of this thrust sheet the rocks are interpreted as a result of deposition on a continental slope or oceanic floor environment, with mixed contributions from Paleo - and Mesoproterozoic rocks of the São Francisco Craton. In spite of the small number of analyzed samples and the uncertainties inherent to the Sm/Nd method the metamorphisms are not considered to be synchronous in the different thrust sheets. This is to be expected in a thrust belt system, in which the more metamorphosed thrust sheets are juxtaposed to less metamorphosed ones. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-07-01 2014-05-27T11:21:54Z 2014-05-27T11:21:54Z |
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://dx.doi.org/10.5327/S1519-874X2006000200005 Geologia USP - Serie Cientifica, v. 6, n. 1, p. 53-66, 2006. 1519-874X http://hdl.handle.net/11449/68966 10.5327/S1519-874X2006000200005 S1519-874X2006000200005 2-s2.0-33749824954 2-s2.0-33749824954.pdf 5234660343892450 |
url |
http://dx.doi.org/10.5327/S1519-874X2006000200005 http://hdl.handle.net/11449/68966 |
identifier_str_mv |
Geologia USP - Serie Cientifica, v. 6, n. 1, p. 53-66, 2006. 1519-874X 10.5327/S1519-874X2006000200005 S1519-874X2006000200005 2-s2.0-33749824954 2-s2.0-33749824954.pdf 5234660343892450 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Geologia USP: Serie Cientifica |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
53-66 application/pdf |
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 |
|
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1803047118315716608 |