Evaluation of 2d Electrical Resistivity Imaging and Self- Potential Anomalies over Agbani Sandstone, Southern Benue Trough: Implication for Sulphide Ore Enrichment

Abstract

The evaluation of 2D electrical resistivity imaging and self potential anomalies over Agbani Sandstone has been carried out. The aim of the study was to investigate the possible/lateral extent of rock types, mineralization potential and their implication for sulphide ore enrichment. Data was acquired using the versatile ohmega resistivity meter, employing wenner configuration and the direct measurement method. Data set were analysed using the Res2dinv and Excel tool kits. Interpretation was basically qualitative. Based on the 2D electrical resistivity interpretation, Agbani sandstone is laterally limited in extent with fractures/joints, while the mineralization potential is high as the result of the high negative sp anomalies. The negative sp value range is -100mV to -500mV. This is practically indicative of a sulphide ore bodies- possibly Pyrite (FeS₂). Possible sulphide ore enrichment model is by gravity flow. The fractures/joints are possible ore enrichment zones. However, stream sediments analysis and rock geochemical studies are recommended.

Keywords:2D resistivity, Self potential, Mineralization potential, Pyrite, enrichment zone, Agbani sandstone.