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Use este identificador para citar ou linkar para este item: https://repositorio.ufba.br/handle/ri/7658
Tipo: Artigo de Periódico
Título: Lead isotope evidence for recent uranium mobility in geological formations of Brazil: implications for radioactive waste disposal
Título(s) alternativo(s): Applied Geochemistry
Autor(es): Iyer, Sundaram Sankara Subba
Babinski, M.
Marinho, M. M.
Barbosa, J .S. F.
Sato, I. M.
Salvador, V. L.
Autor(es): Iyer, Sundaram Sankara Subba
Babinski, M.
Marinho, M. M.
Barbosa, J .S. F.
Sato, I. M.
Salvador, V. L.
Abstract: Lead–lead isotope data from whole rock samples are used to investigate the recent (last few million years) mobility of U and Th. The method is based on the comparison of the calculated present day U and Th concentrations required to yield the Pb isotope composition in the samples with the actual present day concentrations of U and Th obtained by direct measurement. The geological formations studied include the Neoproterozoic carbonate sediments of the Bambuı́ Group, Archean/Paleoproterozoic granite–greenstone terrain of the Contendas–Mirante Complex and a Proterozoic ortho-gneisses hosting U deposit in Lagoa Real. All these formations are in the São Francisco Craton, Brazil. The data show high U mobility in the carbonate sediments and in the deformed ortho-gneisses set in a ductile shear zone. Infiltration of groundwater through fault zones seems to have facilitated the U mobility. The Pb isotope approach is a useful technique complementing U-series disequilibrium studies and may be included for site characterization studies for radioactive waste disposal.
URI: http://www.repositorio.ufba.br/ri/handle/ri/7658
Data do documento: Mar-1999
Aparece nas coleções:Artigo Publicado em Periódico (IGEO)

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