Abstract
A phenomenological model for the evolution of uranium isotopic compositions along groundwater flow-paths is derived from the transport (dispersion) equation, assuming that the sorption processes affecting 238U 234Th and 234U are of first-order kinetics. This model indicates quantitatively the strong influence of the geochemical conditions on changes of the U isotopic composition in an aquifer, especially of the removal rate. Furthermore, the model allows the specification and quantification of conditions concerning the applicability of groundwater dating by U isotopes. Data reported in the literature from three well-investigated sandstone aquifers (Hosston aquifer and Carrizo aquifer, U.S.A., Triassic Sandstone aquifer, G.D.R.) have been utilized for testing the model equations. The results of these first applications indicate the possibility of a U dating method in special cases.
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