Abstract:

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Jigawa State is situated in Nigeria's northwest, between latitudes 11.00oN and 13.00oN and longitudes 8.00oE and 10.15oE. Despite having potential for hydrocarbons and valuable minerals, Jigawa is one of Nigeria's less explored states. This study uses multispectral image data from the LandSat-8 Operational Land Imager (OLI) and Advance Spaceborne Thermal Emission Reflection Radiometer (ASTER) to map alteration zones linked to valuable minerals. Prospective minerals and hydrocarbon alteration zones within the study area were mapped using a variety of remote sensing techniques, including Feature Oriented Principal Component Analysis (Crosta technique), Band Ratio, False Color Composite, Spectral Angle Mapper (SAM), Minimum Noise Fraction (MNF), Pixel Purity Index (PPI), Lineament, and Lineaments density analysis. Crosta technique, band ratio and false color composite results were able to map potential locations of ferric and ferrous irons, as well as carbonate minerals. The crosta technique results were able to identify areas of iron oxides and carbonate minerals. Using spectral analysis of endmembers spectra, SAM, MNF, and PPI classify three (3) distinct alteration zones (phyllic, propylitic, and argillic alterations). Four main trends were identified by lineament orientation analysis: NE-SW, E-W, NW-SE, and NNE-WSW. Lineament density map revealed four major areas with highest density located at east to extreme north-eastern corner trending from west to east, central parts, extreme north-west trending south to north and upper southern having the highest lineament density, the delineated alteration minerals coincide with areas of high lineament density. This research delineates areas of already existing mineral locations. Thus, this suggests the validity and reliability of the adopted methods used.

Keyward(s): Crosta, Hydrothermal alteration, Jigawa, Lineaments, Remote sensing, SAM

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