Geological Mapping of the Panafrican Mokong Gneisess and Granitoides (Far North Cameroon): Contribution of SEMI-automatic Processing from Landsat 8 OIL/TIRS Images

Fields studies, Landsats 8 OIL/TIRS processing and the digital elevation model of SRTM images permit us to maping the Mokong area, region situated in arid zone and located to the Northen part of the central African Orogenic belt in Cameroun. The use of the band number 3 of Landsat made it possible to highlight the lineaments. It has been noticed after analyses that the maximum number of lineaments are in the N-S direction. The second major trends of lineaments in the study area are respectively, ENE-WSW, and E-W and SSE-NNW. The landsat OIL/TIRS processing (composition colored, band math, and principal component analysis) are permit to discriminated 4 mains or associate rocks types of rocks: (gneisses-amphibolite rocks; biotite granite, diorite-granodiorite and tonalite) and alluvial cover. The digital elevation model permit to identifier some volcanic cover. The method used in this work offers promising prospects for geological mapping of arid regions where there is usually little map, because with this method, the time is reduced and the result is more precise.