Integrated geophysical investigation of the mode of occurrence of mineralisation in part of Ilesha Schist Belt, Southwestern Nigeria

Autor: Kazeem Oladimeji Olomo, Ayokunle Adewale Akinlalu, Gbenga Moses Olayanju
Rok vydání: 2021
Předmět:
Zdroj: Arabian Journal of Geosciences. 14
ISSN: 1866-7538
1866-7511
DOI: 10.1007/s12517-021-07849-y
Popis: This research has investigated the mode of occurrence of mineral deposit in Iperindo and its environs with integrated geophysical techniques. Total magnetic intensity map was enhanced by reduction to equator filter, magnetic susceptibility filter and analytic signal to suppress background noise and accentuate magnetic bodies within the field. 3-D Euler deconvolution and radial spectral analysis were both applied to locate and estimate the depth to magnetic anomalous bodies, suspected to host the mineral deposits. The magnetic deposits have a varying depth from 20 to 300 m. Two hundred and twenty-one (221) vertical electrical sounding (VES) stations were occupied to delineate geologic structure which could host mineral deposits within the study area. Quantitative interpretations of the VES curve revealed maximum of five (5) subsurface layers such as top soil, weathered layer, fresh basement and fractured basement. Combined vertical electric sounding and horizontal profiling (VES&HP) was acquired concurrently with induced polarization (IP) using dipole–dipole array to highlight areas with disseminated mineral deposits. The results revealed varying high and low resistivity anomalies across the study area. The observed high resistivity indicates the presence of quartz veins suspected to be hosting sulphide within schist. Areas with relatively low resistivity are suspected to be fault/fracture zones with a depth of 150 m of varying length, which are in agreement with high chargeability zones, indicating disseminated mineral deposits within the faulted/fractured zones. Delineated magnetic anomalies trend northeast–southwest direction implying geologic structures as a result of Pan-African orogeny, which were impregnated with mineralised bodies.
Databáze: OpenAIRE
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