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Open File Report 71

Radioelements in weathered shales and mafic volcanics, Panglo Gold Deposit, Eastern Goldfields, WA

Scott, K.M. and Dickson, B.L.

The K, eU and eTh contents of 111 samples of shales, mafic volcanics and dolerites from the Panglo gold deposit have been determined radiometrically. Shales have consistently higher K, eU and eTh contents than the mafic volcanics and dolerites. However, within shale profiles above the Au mineralization, eTh and eU contents are low relative to equivalent barren profiles. This feature is similar to the behaviour of Sr in the same shale profiles (Scott, 1989a) and, with the additional constraints imposed by the geochemistry of Th, an hypothesis to account for the mineralogical and geochemical features in the shale is presented. Under the acid sulphate conditions resulting from the weathering of sulphides, Th (and U) are envisaged as having migrated from more acid areas to what is now the periphery of the deposit where they are adsorbed onto and/or incorporated into Fe oxides. Strontium in hanging wall rocks at the edge of the deposit is contained largely in Na-rich phyllosilicates which formed during the interaction of later saline groundwaters with the original mica. This saline ground water is probably responsible for the formation of the Ag-free supergene gold deposit at Panglo.

Twenty-seven soil samples from over the deposit have similar concentrations of K, eU and eTh. Because they show no variations which can be related to the underlying geology, a major transported component within the soils is suggested. The eU and eTh contents of pisoliths within the soils indicate that eU and eTh are specifically related to the iron oxide components.

Last updated: Thursday, January 06, 2000 11:46 AM


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