Joint magnetotelluric ? DC resistiviy survey eastern officer basin

Abstract

The Eastern Officer Basin is one of a number of poorly known onshore sedimentary basins (Figure 1). Although there are scattered exposures of Paleozioc sediments, the surface is largely covered by sand hills of the Great Victoria Desert. On the north it is bounded by the Everard Ranges of porosity must decrease, very rapidly below that depth. This compared with depths of 4?6 km interpreted from gravity, magnetic, and seismic reflection data. The difference is probably due to a thickness of sub-horizontal Adelaidean sediments. These would have to be weakly magnetic and lower in density than the surrounding crystalline rocks. The situation is not uncommon in onshore basins.