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Binam Mandeng, E.P., et al. Lithologic and structural mapping of the Abiete–Toko golddistrict in southern Cameroon, using Landsat 7 ETM+/SRTM, C. R. Geoscience, 2018.

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Article

Mapping Hydrothermal Alteration Targets from Landsat 8 OLI/TIRS and Magnetic Data Using Digital Image Processing Techniques in Garoua, North Cameroon

1Department of Geology, University of Buea, P.O Box 63 Buea, Cameroon

2Centre for Geological and Mining Research, P.O Box 333 Garoua, Cameroon


Journal of Geosciences and Geomatics. 2019, Vol. 7 No. 1, 28-41
DOI: 10.12691/jgg-7-1-4
Copyright © 2019 Science and Education Publishing

Cite this paper:
Quentin Marc Anaba Fotze, Anatole Eugene Djieto Lordon, Joseph Penaye, Jean Paul Sep, Mary Immaculate Neh Fru. Mapping Hydrothermal Alteration Targets from Landsat 8 OLI/TIRS and Magnetic Data Using Digital Image Processing Techniques in Garoua, North Cameroon. Journal of Geosciences and Geomatics. 2019; 7(1):28-41. doi: 10.12691/jgg-7-1-4.

Correspondence to: Quentin  Marc Anaba Fotze, Department of Geology, University of Buea, P.O Box 63 Buea, Cameroon. Email: anabafotze@yahoo.fr

Abstract

A geological based remote sensing study was carried out over the Poli group in Garoua (northern Cameroon), renowned for its hydrothermally occurring mineralizations (Gold and Uranium). In this study, Landsat 8 OLI/TIRS coupled with magnetic data were used in order to realize a regional litho-structural mapping of hydrothermal alteration targets, required for mineral exploration. Hence, the enhancement of both Landsat 8 and magnetic data was achieved via digital image processing (DIP) techniques notably Band rationing (BR), Principal Component Analysis (PCA), Horizontal gradient (HG), and lineament extraction algorithms. Based on reference band ratio combinations (Sultan’s and Kaufmann’s) and Crosta Technique (PCA analysis), hydrothermally altered minerals such as hydroxyl-bearing minerals and iron oxides were identified. The PCA map was shown to better illustrate hydrothermally altered areas than Band ratios. Thus, a classification map emphasizing on mineral targets was obtained from the PCA map. Besides, the CET grid analysis tool (horizontal gradient) from Geosoft software 8.4 and the line algorithm (pan band 8) from Geomatica 2013 allowed the extraction of subsurface and surface lineaments respectively. The resulting lineaments showed a predominant E-W trending direction, which suggests a major tectonic event having prevailed within the area. Other directions include NE-SW/ENE-WSW, and N-S. The generation of a target exploration map, via ArcGIS 10.4.1, was performed by the overlay of hydrothermal alteration mapping and structural mapping. New regional maps, providing a useful insight for further mining exploration, were obtained.

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