Preliminary structural study of Landsat Imagery overWamba and Environs, Nasarawa state, Northcentral Nigeria

Wamba and environs is underlain by the migmatities, gneisses. Older Granites, Younger Granites, Awgu Shale and Lafia Formation. LANDSAT 5-TM imagery over the area has been analysed and interpreted in order to determine the lineament trends, drainage network and lineament density across the area. Rose (azimuth-frequency) diagram plots of the structures (lineaments) from both the imagery and field measurements show NE-SW, NNE-SSW, E-W, NNW-SSE andN-S directions with the dominant trends intheNE-SW andNNE- ssw directions. Two prominent faults (Fl, F2) were identified on the imagery. The superposition of the lineament map and drainage map depicts that the dendritic drainage pattern of the area is lithologically and structurally controlled. The lineament map, lineament density contour map, lineament density image map and lineament density surface map show that the lineament density is high around Monkwar, Zamatak, Ninkade, Mugu, Gwanzu and Garko underlain by migmatites, gneisses and Older Granites.