U–Pb geochronology of the Lagoa Real uranium district, Brazil: Implications for the age of the uranium mineralization
| العنوان: | U–Pb geochronology of the Lagoa Real uranium district, Brazil: Implications for the age of the uranium mineralization |
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| المؤلفون: | Nuno Machado, Simone Cerqueira Pereira Cruz, Fernando Flecha de Alkmim, Lydia Maria Lobato, Márcio Martins Pimentel, Carlos Maurício Noce |
| المصدر: | Repositório Institucional da UFOP Universidade Federal de Ouro Preto (UFOP) instacron:UFOP |
| بيانات النشر: | Elsevier BV, 2015. |
| سنة النشر: | 2015 |
| مصطلحات موضوعية: | Metallogenetic implications, Geochemistry, Lagoa Real uranium deposit, Metasomatic alteration, chemistry.chemical_element, Metamorphism, Geology, engineering.material, Uranium, Uranium ore, chemistry, Titanite, Geochronology, engineering, Plagioclase, Earth-Surface Processes, Gneiss, Zircon |
| الوصف: | 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 Industrias 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 Sao Timoteo 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 Sao Timoteo granitoid (U–Pb zircon age) in an extensional setting, coeval with the beginning of the sedimentation of the Espinhaco Supergroup; (ii) 956 ± 59 Ma hydrothermal alteration of the Sao Timoteo 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 Sao Francisco-Congo and Amazonia paleoplates. The 956 ± 59-Ma mineralization age is apparently associated with the evolution of the Macaubas-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. |
| تدمد: | 0895-9811 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71f7881d11b89f90e2581e105f70390cTest https://doi.org/10.1016/j.jsames.2014.12.005Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....71f7881d11b89f90e2581e105f70390c |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 08959811 |
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