Applications of U-series disequilibria and ²³⁶U isotopes: understanding low temperature redox uranium mineralisation

"Variations in uranium isotope compositions are well documented in groundwaters and uranium ores. This is due to the different geochemical and radiogenic behaviours of uranium nuclides during water-rock interactions, and a result of neutron capture processes. These variations are particularly evident within sandstone-hosted uranium deposits which are formed by the low temperature reduction of U(VI) to U(IV). This thesis investigates the behaviour of uranium nuclides during ore formation processes using U and Th concentrations, U-series isotopic ratios (including (234U/238U), (230Th/232Th), (238U/232Th) and (230Th/238U) activity ratios, 238U/235U ratios and 236U/238U ratios from a suite of groundwaters and mineralised sediments in the vicinity of several South Australian sandstone-hosted uranium deposits." -- Abstract.