Fixation of radionuclides in the 238 U decay series in the vicinity of mineralized zones: 1. The Austatom Uranium Prospect, Northern Territory, Australia

Details Fixation of radionuclides in the 238 U decay series in the vicinity of mineralized zones: 1. The Austatom Uranium Prospect, Northern Territory, Australia Fixation of radionuclides in the 238 U decay series in the vicinity of mineralized zones: 1. The Austatom Uranium Prospect, Northern Territory, Australia

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983gecoa..47..403s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 47, Issue 3, pp.403-412

Mathematics

Logic

5

Scientific paper

The minimum age of a zone of secondary uranium mineralization, located at the Austatom Prospect in the Alligator Rivers region of Australia, is estimated to be 3.6 × 10 5 y . This is derived from a geochronological model based on retarded leaching of 234 U with respect to 238 U and on ratios within the ore of these members of the 238 U decay series. Although kaolinite is a dominant mineral in the weathered schist-host-rocks, retarded dissolution of 234 U occurs only in the presence of the clay minerals illite and montmorillonite. In their absence the reverse occurs. A model is proposed to explain the results. Ratios of 230 Th to 238 U indicate that the mineralization has probably remained stationary within the weathered schist for at least 1 to 2 × 10 5 y . Future use of clay minerals as buffers in radioactive waste repositories is supported by the excellent long-term retention obtained for oxidized uranium, probably due in part to isomorphic substitution into the clay crystal lattice.

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