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Evaluation and Detection of Geothermal Potential Zones in Yankari Park, South-Central Part of Bauchi State, North-Eastern Nigeria
ABUBAKAR, AJ; HASHIM, M & POUR, AB
Abstract
Exploiting geothermal (GT) resources requires first and foremost locating suitable areas for its
development. The focus of this paper is to explore the applicability of mapping GT related anomalies by identifying
mineralogy and lithological features at regional scale using image enhancement techniques on Landsat 8 satellite data.
A combination of established Band ratios from literature were implemented on Landsat 8 optical bands using innovative
digital image processing and knowledge-based spectral information extraction techniques which enhanced surface
mineralogy and possible alteration areas of interest. The results indicate that ratios using bands; 7/4, 6/3, 5/7 and 6/7,
4/3, 5/6 and 7/5, 5/4, 6/7 respectively as RGB, were unique but corroborative in enhancing and identifying; clay rich
rocks, iron oxides, micas, carbonates and possible hydrothermal alteration zones related to GT anomaly. The results
could have implication for GT exploration in especially unexplored regions where expensive airborne surveys are
unaffordable.
Keywords
Band ratios; Landsat 8 (OLI); Geothermal; Minerals
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