[en] This report outlines the hydrogeology of the Lake George basin and clarifies the processes involved in the interaction of the groundwater and surface water systems. Hydrochemical evolutionary pathways are different for groundwaters and for surface waters. In surface waters (creek and lake), dolomite and calcite saturation is achieved early but these waters are undersaturated with gypsum. In the groundwaters (catchment and lake bed), saturation with dolomite and calcite is achieved early but equilibrium relationships are more complex. Shallow groundwaters, down to 15 m beneath the lake bed, show evidence of mixing with infiltrating lake waters, and this has retarded mineral precipitation. The deeper, saline groundwaters are close to saturation with gypsum. Stable isotope data also indicate mixing down to 15 m below the lake bed between evaporated lake waters infiltrating downwards and saline groundwaters under upwards pressure. Chlorine-36 determinations indicate that younger groundwaters at 10-50 m below lake bed overlie groundwaters at 100m that are tens of thousands of years old. 39 refs., 3 tabs., 30 figs

[en] Chlorine-36 analyses of groundwater samples from 18 wells in the Victorian and South Australian Mallee region of the Murray Basin have been carried out using the technique of accelerator mass spectrometry. Results of these analyses are discussed and presented as evidence for significant recharge from rainfall over much of the study area to the underlying Murray Group limestone aquifer. In addition, results indicate areas where further ³⁶Cl measurements of Murray Mallee groundwater would provide useful hydrological information on both recharge and discharge mechanisms. 34 refs., 1 tab., 7 figs

[en] The host rock at the Coronation Hill U-Au mine is a debris flow conglomerate, developed in a high-energy fluvial environment during deposition of the Coronation Sandstone of the El Sherana Group. Mineralisation took place by movement of low-temperature fluids from the U-enriched volcanics into the conduit sandstone and eventually into the reduced debris flow conglomerate and carbonaceous shale

[en] Structural mapping and reconnaissance K-Ar studies have helped to delineate and date the latest deformational stages (D4 and D5) in the King Leopold Orogen, to the north of the Canning Basin. The dates have been determined for schists selected from both contractional shear zones and from rocks metamorphosed to the lower greenschist facies during the final phase of basement deformation. These dates imply that the basement-deforming event started in the latest Precambrian to earliest Cambrian (ca 560 Ma), and that tectonism recurred in the latest Cambrian to earliest Ordovician (ca 500 Ma). The final contractional deformation is slightly older than the oldest-known sedimentary rocks in the basin (latest Tremadoc), and helps to define the time that basin subsidence started. 23 refs., 3 tabs., 2 figs