Geomagnetic Studies of Pegmatite Mineralization at Lema and Ndeji North-Central, Nigeria
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The area under study lies in a transition environment of the Nupe Basin and the Southwestern Nigerian Basement 0 0 0 0 Complex, its bounded by latitudes 008 30′ N to 009 00′ N and longitude 005 00′ E to 005 30′ E. Aeromagnetic data were acquired from Nigeria Geological Survey Agency (NGSA) and ground magnetic data of four profiles with two each 2.5 km and other two 1 km each were acquired using Proton-Precession Magnetometer and Earth Magnetometer Model EM2 with the aim of studying mineralization of pegmatite. Qualitative analysis revealed major and minor subsurface geologic structures significantly trending NE-SW direction, believed to have caused mineralization of pegmatite. The high magnetic anomalies in the basement region of the study area are attributed to relatively deep seated low relief basement structures with possible rare metals of columbite and tantalite while region with low magnetic susceptibility are attributed to present of sandstone, quartz, graphite, and feldspar. Different values of gradient and anomalies indicates the presence of numerous and different amplitudes, shapes and orientations. Trend of most structures are in conformity with fault lines in geological map. Quantitative analysis revealed depth to top of magnetic bodies as 10 m to 95 m for ground survey and 0 m to 1.62 km for aeromagnetic survey hence, they are near surface causative with high promising mineralization.
Publication Info:
Author: Aliyu, A. , Lawal, K.M. , Abubakar, I.Y. , Wada, A. , and Olayinka, A.L.
Volume: 56
Issue: March
Published By: Journal of Mining and Geology, 2024-03-01