Evaluation of cover sequence geochemical exploration sample media through assessment of element migration processes
Date
2018
Authors
Baudet, E.
Giles, D.
Tiddy, C.
Hill, S.
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Journal article
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Ore Geology Reviews, 2018; 102:449-473
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Abstract
Cover sequence materials of the Bulldog Shale and underlying Cadna-owie Formation within the Eromanga Basin(South Australia) that overlie the Prominent Hill iron oxide-copper-gold (IOCG) deposit are evaluated for theirpotential to host a geochemical expression of the underlying mineral system and thereby as geochemical explorationsampling media. The Bulldog Shale is clay-rich and has elevated concentrations of trace elements,however, its major and trace element (Cu, Mo, Ni, Pb, U, Zn and REE) chemical characteristics are significantlyinfluenced by intense surface weathering to a depth of ∼50m from the landsurface. The Cadna-owie Formationis sand-dominated with lesser clay-rich horizons and has elevated concentrations of multiple trace elements (Cu,U, Mo, Ni and REE). A positive correlation between trace and Al2O3 suggests these elements are concentratedwithin clay-rich horizons. A comparison with background element concentrations within the Cadna-owieFormation in the broader Eromanga Basin, however, shows introduction of additional elements via upwardelement migration from the underlying mineralised basement rocks and/or downward element migration fromthe Bulldog Shale. Once weathering influences and natural background concentrations are accounted for, elevatedCu concentrations in the Bulldog Shale and trace elements in the Cadna-owie Formation appear to bespatially associated with the Prominent Hill deposit and surrounding prospects and can then be useful samplingmedia for mineral exploration in the Prominent Hill region.
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Data source: Supplementary data, https://doi.org/10.1016/j.oregeorev.2018.09.017
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Copyright 2018 Elsevier