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Current models for regional mineral exploration targeting for nickel and gold mineralisation emphasize the significance of deep penetrating geological structures and the margins of cratonic blocks as areas of greatest prospectivity. As part of a study on regional prospectivity, magnetotelluric (MT) surveys have been completed in several prospective Proterozoic and Archean terrains in Western Australia. These data, which have been interpreted in associated with potential field, seismic, geological and geochemical data, demonstrate that MT surveys can be used to identify such prospective features based on variations in the electrical conductivity of the crust and upper mantle. For example, a survey in the southern Yilgarn Craton has identified lateral changes in deep crust and upper mantle conductivity structure consistent with palaeo-cratonic boundaries inferred from studies using isotope geochemistry. The MT data allow the boundaries to be accurately located; the isotopic results being limited by the spatial distribution of outcrops of suitable lithotypes.
The areas of interest in Western Australia are geographically remote and often environmentally and culturally significant. MT surveys represent a comparatively cheap means of evaluating regional prospectivity, whilst causing minimal cultural and environmental disturbance.
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