U-Pb geochronology of the Lagoa Real uranium district, Brazil : implications for the age of the uranium mineralization.
dc.contributor.author | Lobato, Lydia Maria | |
dc.contributor.author | Pimentel, Márcio Martins | |
dc.contributor.author | Cruz, Simone Cerqueira Pereira | |
dc.contributor.author | Machado, Nuno | |
dc.contributor.author | Noce, Carlos Maurício | |
dc.contributor.author | Alkmim, Fernando Flecha de | |
dc.date.accessioned | 2015-12-10T16:18:32Z | |
dc.date.available | 2015-12-10T16:18:32Z | |
dc.date.issued | 2015 | |
dc.description.abstract | The 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. | pt_BR |
dc.identifier.citation | LOBATO, L. M. et al. U-Pb geochronology of the Lagoa Real uranium district, Brazil: Implications for the age of the uranium mineralization. Journal of South American Earth Sciences, v. 58, p. 129-140, 2015. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0895981114001709>. Acesso em: 11 de set. 2015. | pt_BR |
dc.identifier.doi | https://doi.org/10.1016/j.jsames.2014.12.005 | |
dc.identifier.issn | 0895-9811 | |
dc.identifier.uri | http://www.repositorio.ufop.br/handle/123456789/5946 | |
dc.language.iso | en_US | pt_BR |
dc.rights.license | O periódico Journal of South American Earth Sciences concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3701420469392. | pt_BR |
dc.subject | Lagoa Real uranium deposit | pt_BR |
dc.subject | Metasomatic alteration | pt_BR |
dc.subject | Metallogenetic implications | pt_BR |
dc.title | U-Pb geochronology of the Lagoa Real uranium district, Brazil : implications for the age of the uranium mineralization. | pt_BR |
dc.type | Artigo publicado em periodico | pt_BR |
Arquivos
Pacote Original
1 - 1 de 1
Nenhuma Miniatura disponível
- Nome:
- ARTIGO_U-PBgeochronology.pdf
- Tamanho:
- 2.82 MB
- Formato:
- Adobe Portable Document Format
Licença do Pacote
1 - 1 de 1
Nenhuma Miniatura disponível
- Nome:
- license.txt
- Tamanho:
- 2.57 KB
- Formato:
- Item-specific license agreed upon to submission
- Descrição: