An appraisal of the geologic structure beneath the Ikogosi warm spring in south-western Nigeria using integrated surface geophysical methods

• Main Authors: J.S Ojo, M. O Olorunfemi, D. E Falebita
• Format: Article
• Language: English
• Published: Universidad Nacional de Colombia 2011-06-01
• Series: Earth Sciences Research Journal
• Online Access: http://www.revistas.unal.edu.co/index.php/esrj/article/view/27202

An integrated surface geophysical investigation involving resistivity and magnetic methods was carried out in the immediate vicinity of the Ikogosi warm spring situated in south-western Nigeria with a view to delineating its subsurface geological sequence and evaluating the structural setting beneath the warmspring. Total field magnetic measurements and vertical electrical sounding (VES) data were acquired along five N-S traverses. Magnetic and VES data interpretation<br /> involved inverse modelling. The inverse magnetic models delineated fractured quartzite/faulted areas within fresh massive quartzite at varying depths and beneath all traverses. The geoelectrical sections developed from VESinterpretation results also delineated a subsurface sequence consisting of a topsoil/weathered layer, fresh quartzite, fractured/faulted quartzite and fresh quartzite bedrock. It was deduced that the fractured/faulted quartzite may have acted as conduit for the<br /> movement of warm groundwater from profound depths to the surface while the spring outlet was located on a geological interface  (lineament).