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Type: Thesis
Title: Gold mobility within dune systems on the Barns property, Wudinna, South Australia: a partial extraction approach
Author: McEntegart, L. B.
Issue Date: 2004
School/Discipline: School of Physical Sciences
Abstract: Regolith carbonate is an established sampling medium in Au exploration. It has a demonstrated correlation with Au content in south western Australia and was the prime indicator in the discovery of the Barns Au prospect Eyre Peninsula, South Australia. Whole rock ICP-MS, AAS and XRF analyses on samples from regolith drill cores and a trench cut into an aeolian sand dune on the Barns prospect established a correlation of Au content (≤17 ppb) with Ca, K, Al and Mg. XRD whole rock and mineral-separate analyses identified calcite, smectite and ankerite/dolomite as the main authigenic mineral phases present in the dune sand. The range of Sr isotope ratios of regolith carbonate (87Sr/86Sr = 0.716234±16) and bedrock (87Sr/86Sr = 0.731205±15) samples and their systematic variation imply that the Sr (and Ca) in the authigenic minerals was derived from a combination of surface (87Sr/86SrSMOW = 0.709) and bedrock sources (87Sr/86Sr = 0.731205±15). Sequential extraction designed to determine gold fractionation between the authigenic mineral phases showed that Au is most prominently extracted from a Fe-Mn oxide phase while dissolution of carbonate does not necessarily mobilise the Au.
Dissertation Note: Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2004
Where: Gawler Craton, Eyre Peninsula, South Australia
Keywords: Honours; Geology; gold; calcrete; regolith carbonate; sequential extraction; particle size separation; Sr isotopes; Barns gold prospect
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