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. Keywords: Ifewara-Zungeru, remote sensing, field mapping, structural analysis, metasediments.
Highlights
The Zungeru area is a part of Nigeria’s Precambrian basement complex terrain which is a segment of the regional Dahomeyide fold belt (Affaton et al, 1991) (Fig. 1)
Ajibade et al (1979) described the character of the Zungeru Mylonites as a well-defined foliation resulting from the alignment of mica, quartz and lenticular feldspar porphyroclasts, accompanied by colour banding and compositional layering
A pair of satellite imageries over the study area fault exists with a drag along NE-SW direction between covering about 15,000 km[2] on a scale of 1:800,000 was Kann and Bogi
Summary
The Zungeru area is a part of Nigeria’s Precambrian basement complex terrain which is a segment of the regional Dahomeyide fold belt (Affaton et al, 1991) (Fig. 1) It is not excluded from the structural and deformational episodes that are known to have pervaded the terrain. A pair of satellite imageries over the study area fault exists with a drag along NE-SW direction between covering about 15,000 km[2] on a scale of 1:800,000 was Kann and Bogi. South trending outcrops are folded with plunge towards NW and NNW directions at the middle and southwestern parts of the Kaduna River at this point It is exhibited by a high study area respectively (Fig. 3). The fracture runs parallel to the edges of folded rocks plunging at Umoru
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