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Author Vogel, J.C.; Talma, A.S.; Heaton, T.H.E.; Kronfeld, J.
Title Evaluating the rate of migration of an uranium deposition front within the Uitenhage Aquifer Type Journal Article
Year (up) 1999 Publication Journal of Geochemical Exploration Abbreviated Journal
Volume 66 Issue 1 Pages 269-276
Keywords redox changes in aquifer, sandstone-type uranium deposit, South Africa, uranium series
Abstract The solubility of uranium in groundwater is very sensitive to changes in redox conditions. Many secondary (sandstone-type) uranium deposits have been formed when soluble U has precipitated after encountering reducing conditions in the subsurface. In the groundwater of the Uitenhage Aquifer (Cape Province, South Africa), 238U-series isotopes were used to assist in studying the history of the reducing barrier. Uranium isotopes were used to determine the present position of the barrier. Radium and radon were used to evaluate the path of migration that the front of the oxygen depletion zone has taken over the past 105 years. During this time the reducing barrier has moved, leaving in its wake a trail of U in various stages of secular equilibrium with its daughter 230Th. The 226Ra daughter of 230Th is not very mobile. Its growth upon the aquifer wall is reflected in the Rn content of the water. This in turn, due to the relatively great age of the water, indicates the extent of the 230Th ingrowth (from precipitated U) that took place before the barrier migrated.
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Call Number THL @ christoph.kuells @ vogel_evaluating_1999 Serial 126
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Author Klock, H.; Külls, C.; Udluft, P.
Title Estimation of relative recharge values for the northern Kalahari catchment, Namibia Type Journal Article
Year (up) 2000 Publication Journal of African Earth Sciences Abbreviated Journal
Volume 30 Issue 4 Pages 47-48
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Call Number THL @ christoph.kuells @ Klock2000estimation Serial 33
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Author Zagana, E.; Külls, C.; Udluft, P.
Title Der Wasserhaushalt des Aliakmonas Type Journal Article
Year (up) 2000 Publication Vom Wasser Abbreviated Journal
Volume 94 Issue Pages 29-39
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Call Number THL @ christoph.kuells @ Zagana2000saa Serial 34
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Author Külls, C.; Adar, E.M.; Udluft, P.
Title Tracer Studies and Modelling of Regional Groundwater Systems-Resolving patterns of groundwater flow by inverse hydrochemical modelling in a semiarid Kalahari basin Type Journal Article
Year (up) 2000 Publication IAHS Publications-Series of Proceedings and Reports-Intern Assoc Hydrological Sciences Abbreviated Journal
Volume 262 Issue Pages 447-452
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Publisher Wallingford [Oxfordshire]: IAHS, 1981- Place of Publication Editor
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Call Number THL @ christoph.kuells @ Kuells2006 Serial 31
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Author Constantinou, C.; Udluft, P.
Title Mapping the availability and dynamics of groundwater recharge. Part 2: Case studies from Mediterranean Basins Type Conference Article
Year (up) 2000 Publication Proceedings of Third Congress on Regional Geological Cartography and Information Systems Abbreviated Journal
Volume Issue Pages 163-168
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Call Number THL @ christoph.kuells @ Constantinou2000mapping Serial 61
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