Abstract
The uranium microdistribution of gold-bearing pyritic conglomerates of the Kaapvaal Craton, South Africa, was investigated by means of 235U-fission track radiography. The uranium in the samples generally occurs bimodally distributed as detrital U-minerals, especially uraninite, or as fine dispersions associated with carbonaceous matter, pyrite, leucoxene and matrix minerals. Evidence is given for a repeated mobilization of uranium within the consolidated sediments. No indication was found for a synsedimentary introduction of the dispersed uranium into the basins of deposition by hydrous solution which would require an oxidizing earth atmosphere some 2.6 × 10 9 y ago.
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