FDEM & magnetic data integration for kimberlite exploration – Remanent magnetization and apparent susceptibility mapping

We present a case of FDEM and Magnetic data integration for kimberlite exploration in the Northwest Territories, Canada. Data comes from six high resolution helicopter-borne surveys commissioned by the Northwest Territories Geological Survey (NTGS). Analysis starts with the calculation of an apparent magnetic susceptibility distribution from the FDEM data. This is then compared to magnetic susceptibility derived from the total field magnetic data. The differences allow to recognize areas of prominent remanent magnetization. Helbig analysis on the magnetic data over these areas gives an estimate of NRM intensity and direction. Integration of these results with the Apparent Polar Wander Path for the area of study, gives us a full understanding of the different components of the NRM (thermal and viscous).