Litho-Structural Characterization Using Aeromagnetic Data Around Igabi Northwestern Nigeria

Abstract

The present study aims at delineating basement depth and contact locations, deduced from the available aeromagnetic data around Igabi Northwestern part of Nigeria. Total gradient amplitude and Source Parameter Index techniques were used to calculate the depth to the magnetic basement sources. They reflected similar results for estimating the basement depths ranging from -63051.21m to -7639.14 m. Furthermore, the tilt angle derivative maps results revealed various anomalous trends and to source depth of magnetic value over 3000 m. Spectral Analyses suggest depth to magnetic sources range from deep, intermediate and shallow with depths between 40 and 60m for shallow and 600 m to 1200 m for intermediate and 900 m to 3200mfor deep sources on the magnetic map. The obtained Euler anomalies depths range from <386.5 m to >2054 m for the magnetic map. This study, therefore, suggest rocks that varies in depth based on their lithologies that led to variations in the measured magnetic field parameters in the study area.