Abstract
Recent application of the Geonic EM 16 very low frequency electromagnetic instrument within the Basement Complex in the Igbeti district, southwestern Nigeria, revealed that the method can be successfully used to map non-conductive mineral bodies like marble and quartzite, as well as geological boundaries and faults. Rocks of extremely low conductivity were marked by very distinct VLF anomalies with varying magnitudes determined by the conductivity contrast between any two adjacent rock types. A poorly known north-south trending fault traversing the western margin of the Igbeti marble was mapped and confirmed by the VLF survey. The results obtained over the marble indicates that the technique is cost effective and particularly suitable for mapping such lithologies, especially where the geology is relatively simple.
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