Basement and Automatic Depth to Magnetic Source Interpretation of Parts of Southern Benue Trough and Anambra Basin.

Abstract

Aeromagnetic data of sheet 288 and 289 (Igumale and Ejekwe sheet) have been evaluated in order to delineate the magnetic sources and estimate the depths to basement (sedimentary thickness) in the area. SPI technique and analytical signal were used to estimate the magnetic source locations. Visual study of the analytical map shows the presence of igneous intrusions in some part of the area. The output from SPI method and analytical signal are images from which the depths were determined. Maps of the upward continuation emphasized long wavelength basement anomalies. Analytical signal filter revealed nearsurface anomalies whose magnitudes range between 0.00009m and 3.72295m. While result from Source parameter Imaging show deep source anomalies of 52.58m minimum depth and a maximum depth of 11848.84m.