Interpretation of magnetotelluric and airborne electromagnetic inversions from the Proterozoic basins of the Capricorn Orogen, WA

Recently, a regional-scale TEMPEST AEM survey and a local-scale MT survey were acquired over the Yerrida Basin in the Capricorn Orogen, WA. These two electromagnetic datasets provide an opportunity to compare the electromagnetic responses from both the near surface and deeper sedimentary packages within a basin terrain. Both a 3D ModEM inversion of the new MT survey data, and a 1D GA-LEI inversion of a single survey line from the AEM survey data over the Yerrida Basin were jointly interpreted to validate current knowledge of the basin geology. It was found that both the MT and AEM results did not resolve contrasting resistivity variations associated with craton scale structures. However, the new 3D MT inversion, and to a lesser extent the 1D AEM inversion, were useful for interpreting the detailed localscale faulting and folding of the Yerrida Basin sediments.