Uranium ore-forming systems of the - Geoscience Australia
Uranium ore-forming systems of the - Geoscience Australia
Uranium ore-forming systems of the - Geoscience Australia
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<strong>Uranium</strong> <strong>ore</strong>-<strong>forming</strong> <strong>systems</strong> <strong>of</strong> <strong>the</strong> Lake Frome regionresults for uranium transport and deposition are essentially <strong>the</strong> same. The model thus explains whywaters in <strong>the</strong> Paralana Hot Springs contain such low levels <strong>of</strong> uranium.Figure 7.10: Simulation <strong>of</strong> surface water downflow into granite at 25-100ºC, showing changes in <strong>the</strong>concentration <strong>of</strong> dissolved uranium (blue line) and in <strong>the</strong> oxidation state <strong>of</strong> <strong>the</strong> fluid (red line; initiallysaturated with oxygen). The calculations are for equilibrium with a uranium-bearing granite similar to<strong>the</strong> Mount Neil Granite.Figure 7.11: Simulation <strong>of</strong> fluid upflow along <strong>the</strong> Paralana Fault zone at 100-25ºC, showing changes in<strong>the</strong> concentration <strong>of</strong> dissolved uranium (blue line) and in <strong>the</strong> oxidation state <strong>of</strong> <strong>the</strong> fluid (red line). Thecalculations assume equilibrium with and rock buffering by a uranium-bearing granite similar to <strong>the</strong>Mount Neil Granite.Page 98 <strong>of</strong> 151