Abstract
The Ifewara-Zungeru megastructure is an over 550-km long NNE-SSW trending fault stretching from the south just east of Ijebu Ode, through Ifewara and Okemesi to the southwestern edge of the River Niger around Lafiagi. It reappears beneath the sediments of the Nupe Basin and extends northeastwards for over 300 km, through Zungeru to Kalangai. Detailed remote-sensing mapping of the lateral extent of this suspected shear zone using satellite imagery field mapping ground-truthing survey was carried out. Structural analysis of the fault system was done across the entire area that was traversed.The results obtained from this investigation revealed that satellite imagery study of a segment of the megastructure shows a ductile dextral fault zone with a drag towards the NNW direction in Zungeru area. Highlevel folding of meta-sediments exist within the area with directions almost perpendicular to the general NNE-SSW trend of the host rocks. This faulting caused a measure of morphostructural reorientation of the mylonites and enclosing schistose rocks.
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