Malaysian Journal of Geosciences (MJG)

Geological mapping of basement rocks in Kaduna Polytechnic Main Campus and its Environs was carried out. The study area is bounded by latitude 10o30’0.00”N to 10036’0.00”N and longitude 007024’0.00”E to 007030’0.00”E of sheet 123 Kaduna. The study aims at identification and classification of the rock units within the study area. Results of the Geological Mapping within the study area reveals that the study area falls within the Migmatite Gneiss Complex of Nigeria. The result also shows that there are various structural features prevalent within the study area namely; fractures, joints, faults and intrusion of quartz veins. Rose diagram generated shows structural trend of mineralization along northwest to southeast (NW-SE) direction. Petrographic studies on the rock samples indicates that the study area is predominantly underlain by the Migmatite Gneiss Complex with Medium to coarse grain Migmatitic Gneisses and Amphibolite which is part of the Older Granite suite of the basement complex whose mineralogy, color, relative time of emplacement, and texture vary greatly. The results of petrographic analysis of Migmatitic Gneiss shows the modal mineralogical composition of Medium to coarse grain granite reveals a percentage ratios of 40% Orthoclase feldspar: 40% Quartz: 20% Biotite whereas Amphibilite has 40% Biotite: 30% Quartz and 30% Orthoclase feldspar. The rock aggregate in the study can provide good construction materials such as in the construction of roads, bridges, houses etc. The Geophysical investigation indicate the presence of shallow layer of disturbed soil as the top lithology (< 320 m/s) underlain by basement rocks with high seismic velocities of > 2139 m/s.