Abstract
Cowart, J.B. and Osmond, J.K., 1977. Uranium isotopes in groundwater: their use in prospecting for sandstone-type uranium deposits. J. Geochem. Explor., 8: 365–379. The relative abundances of dissolved 238 U and its daughter 234 U appear to be greatly affected as the uranium is transported downdip in sandstone aquifers. In an actively forming uranium accumulation at a reducing barrier, an input of 234 U occurs in proximity to the isotopically non-selective precipitation of uranium from the water. The result is a downdip water much lower in uranium concentration but relatively enriched in 234 U. The measurement of isotopic, as well as concentration, changes may increase the effectiveness of hydrogeochemical exploration for uranium. The investigation includes the uranium isotopic patterns in aquifers associated with known uranium orebodies in the Powder River and Shirley Basins, Wyoming, and Karnes County, Texas, U.S.A. In addition, the Carrizo sandstone aquifer of Texas was studied in detail, and the presence of an uranium accumulation inferred.
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