Retention of actinides in natural pyrochlores and zirconolites
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Date
1994-12-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
De Gruyter
Abstract
Natural pyrochlore and zirconolite undergo a crystalline-aperiodic transformation caused by alpha-decay of 232Th and 238U at dose levels between 2X1014 and 3X1017 α/mg. The principal effects of the transformation are volume expansion and micro-fracturing, providing potential pathways for fluids. Geochemical alteration of the minerals may occur under hydrothermal conditions or in low temperature, near surface environments, but Th and U usually remain immobile and can be retained for time scales up to 10 9 years. However, the Th-U isotope systematics of a zirconolite-bearing vein and dolomite host rock may provide evidence for disequilibrium between 230Th, 234U and 238U. © 1994 R. Oldenbourg Verlag, München
Description
Keywords
Pyrochlore, Actinides, Zirconolite, Alpha decay, Uranium, Thorium, Geochemistry, Physical radiation effects
Citation
Lumpkin, G. R., Hart, K. P., McGlinn, P. J., & Payne, Τ. E. (1994). Retention of actinides in natural pyrochlores and zirconolites. Radiochimca Acta, 66/67 (Supplement), 469-474. doi:10.1524/ract.1994.6667.special-issue.469