U-Pb geochronology of the Lagoa Real uranium district, Brazil : implications for the age of the uranium mineralization.

Registro completo de metadados
Autor(es): dc.creatorLobato, Lydia Maria-
Autor(es): dc.creatorPimentel, Márcio Martins-
Autor(es): dc.creatorCruz, Simone Cerqueira Pereira-
Autor(es): dc.creatorMachado, Nuno-
Autor(es): dc.creatorNoce, Carlos Maurício-
Autor(es): dc.creatorAlkmim, Fernando Flecha de-
Data de aceite: dc.date.accessioned2019-11-06T13:35:35Z-
Data de disponibilização: dc.date.available2019-11-06T13:35:35Z-
Data de envio: dc.date.issued2015-12-10-
Data de envio: dc.date.issued2015-12-10-
Data de envio: dc.date.issued2015-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/5946-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/558901-
Descrição: dc.descriptionThe Lagoa Real uranium district in Bahia, northeastern Brazil, is the most important uranium province in the country and presently produces this metal in an open-pit mine operated by Indústrias Nucleares do Brasil. Uranium-rich zones are associated with plagioclase (dominantly albite ± oligoclase) -rich rocks, albitites and metasomatized granitic-gneisses, distributed along NNW/SSE striking shear zones. We have used the ID-TIMS U-Pb method to date zircon and titanite grains from the São Timóteo granitoid, and albite-rich rocks from the Lagoa Real district in order to assess the age of granite emplacement, deformation/metamorphism and uranium mineralization. The isotopic data support the following sequence of events (i) 1746 ± 5 Ma - emplacement of the São Timóteo granitoid (U-Pb zircon age) in an extensional setting, coeval with the beginning of the sedimentation of the Espinhaço Supergroup; (ii) 956 ± 59 Ma hydrothermal alteration of the São Timóteo granitoid and emplacement of the uranium mineralization (U-Pb titanite age on an albite-rich sample); (iii) 480 Ma metamorphism, remobilization and Pb loss (U-Pb titanite age for the gneiss sample), during the nucleation of shear zones related to the collision between the São Francisco-Congo and Amazonia paleoplates. The 956 ± 59-Ma mineralization age is apparently associated with the evolution of the Macaúbas-Santo Onofre rift. This age bracket may bear an important exploration implication, and should be included in the diverse age scenario of uranium deposits worldwide.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Journal of South American Earth Sciences concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3701420469392-
Palavras-chave: dc.subjectLagoa Real uranium deposit-
Palavras-chave: dc.subjectMetasomatic alteration-
Palavras-chave: dc.subjectMetallogenetic implications-
Título: dc.titleU-Pb geochronology of the Lagoa Real uranium district, Brazil : implications for the age of the uranium mineralization.-
Aparece nas coleções:Repositório Institucional - UFOP

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