The relative mobility of U, Th and Ra isotopes in the weathered zones of the Eye-Dashwa Lakes granite pluton, northwestern Ontario, Canada

Details The relative mobility of U, Th and Ra isotopes in the weathered zones of the Eye-Dashwa Lakes granite pluton, northwestern Ontario, Canada The relative mobility of U, Th and Ra isotopes in the weathered zones of the Eye-Dashwa Lakes granite pluton, northwestern Ontario, Canada

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.2787l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 51, Issue 10, pp.2787-2793

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Scientific paper

Radioisotope activity ratios of weathered surface rocks from the Eye-Dashwa Lakes granite pluton show that, in the 238 U decay series, 226 Ra has been leached more rapidly than the grandparent 234 U and 238 U isotopes. The observation of 238 Th / 232 Th disequilibria in the 232 Th decay series shows that either 228 Th (half-life of 1.9 yrs) or 228 Ra (half-life of 5.75 yrs) have been removed from these rocks very rapidly indeed. Isotope ratios of separated mineral fractions appear to show that whereas uranium tends to be removed from all mineral fractions, Ra is strongly readsorbed onto feldspars, presumably as these undergo alteration to clay minerals. This necessitates making a distinction between intermineral mobility of U or Ra, and the net loss of U or Ra from the whole rock. An attempt has been made to model, quantitatively, the transport rate of Ra, though with little success. Failure of the modelling appears to indicate that the mobility of 228 Ra is higher than might be predicted by the mobility of 226 Ra; that is, the two isotopes are not strict analogues of one another in their response to initial weathering.

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