Proveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais)

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dc.contributor.authorDa Silva, Carlos Humberto
dc.contributor.authorSimões, Luiz Sergio Amarante [UNESP]
dc.contributor.authorKrymsky, Robert
dc.contributor.authorMacambira, Moacyr José Buenano
dc.contributor.institutionUniversidade Federal de Mato Grosso (UFMT)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Pará (UFPA)
dc.date.accessioned2014-05-27T11:21:54Z
dc.date.available2014-05-27T11:21:54Z
dc.date.issued2006-07-01
dc.description.abstractThe 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.en
dc.description.affiliationDepartamento de Geologia Geral Institute de Ciências Exatas e da Terra UFMT, Av. Fernando Corrêa s/n, CEP 78060-900, Cuiabá, MT
dc.description.affiliationDepartamento de Petrologia e Metalogenia IGCE UNESP, Rio Claro, SP
dc.description.affiliationLaboratório de Geologia Isotópica Centro de Geociências e Ciências Exatas UFPA, Belém, PA
dc.description.affiliationUnespDepartamento de Petrologia e Metalogenia IGCE UNESP, Rio Claro, SP
dc.format.extent53-66
dc.identifierhttp://dx.doi.org/10.5327/S1519-874X2006000200005
dc.identifier.citationGeologia USP - Serie Cientifica, v. 6, n. 1, p. 53-66, 2006.
dc.identifier.doi10.5327/S1519-874X2006000200005
dc.identifier.file2-s2.0-33749824954.pdf
dc.identifier.issn1519-874X
dc.identifier.lattes5234660343892450
dc.identifier.scieloS1519-874X2006000200005
dc.identifier.scopus2-s2.0-33749824954
dc.identifier.urihttp://hdl.handle.net/11449/68966
dc.language.isopor
dc.relation.ispartofGeologia USP: Serie Cientifica
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAraxá Group
dc.subjectBrasília Belt
dc.subjectCanastra Group
dc.subjectSm/Nd ages
dc.subjectevolution
dc.subjectlithology
dc.subjectmetamorphic rock
dc.subjectProterozoic
dc.subjectthrust fault
dc.subjectBrazil
dc.subjectMinas Gerais
dc.subjectSao Francisco Craton
dc.subjectSouth America
dc.subjectCanastra
dc.titleProveniência e idade do metamorfismo das rochas da faixa Brasilia, na região de tapira (SW de Minas Gerais)pt
dc.title.alternativeOrigin and metamorphic ages of the rocks of the Brazilia Fold Thrust Belt in the Tapira area (SW of Minas Gerais)en
dc.typeArtigo
dcterms.licensehttp://www.revistas.usp.br/guspsc/about/editorialPolicies#openAccessPolicy
unesp.author.lattes5234660343892450[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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Artigos - Petrologia e Metalogenia - IGCE