Whole-rock chemistry of the Gameleira I uranium deposit,Lagoa Real,Brazil |
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Institution: | 1. Programa de Pós-Graduação em Ciência e Tecnologia das Radiações, Minerais e Materiais. Centro de Desenvolvimento da Tecnologia Nuclear (CDTN), Av. Antonio Carlos 6627, Belo Horizonte, MG, 30270-901, Brazil;2. Programa de Doctorado em Geología. Departamento de Geología, Facultad de Ciencias, Universidad de Salamanca, Plaza de los Caídos, s/n, 37008, Salamanca, Spain;3. Centro de Pesquisas Professor Manoel Teixeira da Costa (CPMTC), Instituto de Geociências, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos 6627, Belo Horizonte, MG, 31270-901, Brazil;4. Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Av. Antônio Carlos 6627, Belo Horizonte, MG, 30270-901, Brazil |
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Abstract: | The Lagoa Real uranium (U) province, referred to as Lagoa Real, is located in the state of Bahia, north-eastern Brazil. Lagoa Real has ∼112,000 metric tonnes and average grade of 2700 ppm of U3O8, being one of the largest U deposits in the world and the largest in Brazil. Despite its economic and strategic importance, there are gaps in the geological knowledge of the Lagoa Real U deposits. One of them is the lack of extensive whole-rock chemical data sets. Here, we present whole-rock chemical analyses for major and trace elements, including the rare-earth elements (REE), from barren country rocks to uraniferous ore shoot, systematically sampled from an exploratory drill hole. The chemical data indicate that albitite rocks, with and without uraniferous mineralisation, cannot result from sodic syenitic magmatism, as proposed by recent studies. Petrographical and geochemical evidence supports the previously suggested concept that the Lagoa Real albitite rocks resulted from sodic metasomatism of the granitic country rock, known as the São Timóteo granite. Their ore-mineral assemblages and geochemical characteristics are similar to albitite-hosted U deposits worldwide. |
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Keywords: | Whole-rock chemistry Lagoa Real uranium province Chemical profile Albitite Sodic metasomatism |
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