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Uranium Redistribution and Fixation During Chlorite Weathering at Koongarra, Australia

  • Takashi Murakami (a1), Hiroshi Isobe (a1), Tetsushi Nagano (a1) and Satoru Nakashima (a2)

Abstract

The chemical forms of iron minerals and uranyl species have been examined non-destructively by visible microspectroscopy and electron microprobe analysis in order to obtain a better understanding of uranium redistribution and fixation mechanisms. The uranyl species are associated with sub-micron sized iron minerals, such as hematite (Fe2O3), goethite (FeOOH), and ferrihydrite (Fe4-5(OH,O)12). Additionally, some uranium is fixed to goethite in weathered chlorite grains. Sub-micron sized saleeite, Mg(UO2)2(PO4)2. 1OH2O, is the most probable uranyl phase associated with the iron minerals. This suggests that the uranium fixation in the vicinity of the Koongarra uranium ore deposits is the result of the coprecipitation and sorption of microcrystals of saleeite on to the iron minerals released during weathering of chlorite.

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Uranium Redistribution and Fixation During Chlorite Weathering at Koongarra, Australia

  • Takashi Murakami (a1), Hiroshi Isobe (a1), Tetsushi Nagano (a1) and Satoru Nakashima (a2)

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