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Economic Geology; July 1964; v. 59; no. 4; p. 586-595
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Radioactive disequilibrium studies of roll features, Shirley Basin, Wyoming

J. R. Dooley, M. Tatsumoto, and J. N. Rosholt

Isotopic abundances of Th-230 and Pa-231 are compared with those of parent uranium isotopes in various parts of ore rolls. Daughter products exceed equilibrium amounts in ore, suggesting presence of uranium-rich pore water. Lack of a large excess of daughter products in altered rock in core of ore rolls indicates that roll front has not moved significantly in past 250,000 years.

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Science, August 28, 1981; 213(4511): 1002 - 1002.
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