AEM maps paleo-topography, conductors, and dykes in the Capricorn Orogen, Western Australia

An Xcite AEM and magnetic survey was flown near Onslow, Western Australia to prospect for possible gold hosting sulphide bodies. Processing of AEM data to conductivity-depth sections, depth slices and voxels defined the base of the Cretaceous Carnarvon Basin over the Proterozoic Capricorn Orogen. A complex, inter-related network of linear magnetic and AEM anomalies occurs in an apparent basement-high of the Capricorn Orogen. 3D visualisation of AEM processing and modelling results showed that the base of the Carnarvon Basin has a complex palaeo-topography controlled by long, linear, dolerite dykes, interpreted granites and banded iron formations. The dykes may in turn be controlled by stratigraphic conductors related to faulting in the Capricorn Orogen. A planned drilling program will test the strongest AEM anomalies and confirm the source of the conductors.