Uranium ore-forming systems of the - Geoscience Australia

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Uranium ore-forming systems of the Lake Frome regionLocality 12 (349930E ; 6660790N) Paralana Hot SpringsThe Paralana Hot Springs is on the Paralana Fault near where Hot Springs Creek crosses therangefront consisting of predominately Mesoproterozoic basement containing uraniferousgranites and gneisses. The Paralana Hot Springs result from meteoric water circulating throughhot rocks, and are the surface expression of a cyclic, low-temperature, non-volcanichydrothermal system (Brugger et al., 2005).The springs flow continuously from the fault zone forming two pools of water adjacent tobrecciated and jasperized basement boulders. The temperature of the water is around 60ºC,flowing around 16,000 L/s, has a pH of 7-8, total dissolved salts of 1144 mg/L and contains~0.07ppb U (Brugger et al., 2005).This section of the creek is one of the most vegetated in the region, dominated by river red gums(Eucalyptus camaldulensis), inland teatrees (Melaleuca glomerata) and bulrush (Typhadomingensis). Large algal blooms are within the hot spring pools and pools within the adjacentstream channel (McKelson, 2000).Analysis by McKelson (2000) has shown that river gums contain ~1ppm U, the bulrushes~1ppm U, the inland teatrees ~2-8 ppm U but interestingly the algal mat contains ~24ppm U.Results show that the levels of thorium and lead within the algae are also significantly higherthan those of the spring water and the other plant species.Page 137 of 151
Uranium ore-forming systems of the Lake Frome regionLocality 13 (355368E ; 6665889N) Four Mile ThrustThere is no track to this locality and a 30 minute hike is required from the Arkaroola-Wooltanaboundary track a few kilometers north of Four Mile Creek.This site features a dramatic example of young tectonic thrust faulting on the northern side of asmall creek on the range front.Further interpretation of this area is required as a recent re-examination suggests Proterozoicbasement thrust over mottled Eyre Formation and poorly consolidated Willawortina Formation.Célérier (Célérier, 2002), however, interprets the footwall of the structure to be entirelyWillawortina Formation with the matrix composed of kaolinite and quartz sand, and the mottlesdefined by variations in abundance of red-brown hematite. Overlying the WillawortinaFormation sediments is a wedge of modern red hill scree covering parts of the outcrop. Thehangingwall of the outcrop is a complex feature, within which there are several reverse faultswith varying orientations consisting of Eyre Formation and Neoproterozoic Paralana Quartzite.Page 138 of 151
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