THE GEOLOGY AND PETROGRAPHY OF NASSARAWA EGGON TOWN AND ENVIRONS (PART OF WAMBA SHEET 210 SW) NORTH-CENTRAL NIGERIA

The study area falls in Nasarawa Eggon and its environs in Nasarawa State, Nigeria, part of Wamba Sheet 210SW. .The area falls between Latitudes 8°4T00,rN to 8045'00"N and longitudes . 8o3O'00"E and 8°30'00"E. Geologically, the field mapping of 40mk2 was done on a scale of 1:12,500, was carried out to delineate the geology and petrography of the area. The area is ’ underlain by the Younger Granite Complex of North Central Nigeria. Study revealed that the area is underlain by migmatite gneiss that -has been altered largely due to .metamorphism by one or more deformational Orogenic phase! Overlaid by ‘these rocks are pegmatite and quartz veins that form part of the rock emplace during the Pan-Africa Orogeny. z Petrography studied of these rocks revealed that the, rocks are composed of quartz, feldspar, microcline, biotite, plagioclase and ferromagnesium mineral. Structural analyses showed that foliation trend of the rocks are NW-SE, NNE-SSWy NNE-SSE and NNW-SSE, followed by infilling of quartz, felsic and mafic dyke, faulting of these structural controlled mineralization marked the uplift and intense fracturing of these rocks predominantly NE-SW is characteristic of the Pan-African Orogeny.