Figures index


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

Danra Moh Guela Guy Basile, Tchameni Rigobert, Daouda Dawaï, Fosso Tchunte Periclex Martial, Awé Salomon, Bisségué Jean Claude

Journal of Geosciences and Geomatics. 2019, 7(2), 80-87 doi:10.12691/jgg-7-2-4
  • Figure 1. Geological map of North Cameroon (redrawn after [3]): 1) Post Panafrican sedimentary cover ; 2) Late-post tectonic granitoids; 3) syn-tectonic granitoids ; 4) batholith : tonalites, trondjémites and granodiorites of Mayo-Kebbi ; 5) medium and high grade metamorphism of NW Cameroon Domain ; 6) mafic to intermediate domain of Mayo-Kebbi domain (metadiorite and gabbro diorite) and amphibolitic; 7) the low-grade, high-grade Neoproterozoic metamorphic volcano-sedimentary sequences of the Poli-Léré group; 8) Paleoproterozoic remobilized from Adamawa-Yadé domains; 9) collision zone; 10) direction and sense of faults; TBSZ: Tcholliré-Banyo shear zone; GGSZ: Godé-Gormaya shear zone; 11) border between states
  • Figure 2. Location of the study area. A: Africa continent B: Administrative map of Cameroon showing the study area in the far north. C: .Map of the study area obtain from the 234 band as R: 4, G: 3 and B
  • Figure 3. Flowchart shows steps lineaments extraction and analysis. Inspired after [12,16,17]
  • Figure 4. Organigram of the different treatments. PCA(principal component analysis); CC(colored composition); DEM (digital elevation model) Inspired after [18,19,20]
  • Figure 5. Four subset filtered images derived from panchromatic band of Landsat 8 OLI/TIR
  • Figure 6. (a) Automatic extraction lineament map, result to the superposition of the four. (b) lineaments map obtain after validation process
  • Figure 7. Rose diagram for extracted lineament
  • Figure 8. Segmentation carried out on the 3 OLI band discriminating the crystalline rocks of alluvium and crystallophyllian rocks.
  • Figure 9. 256PCA, 157PCA, 156 PCA
  • Figure 11. Digital elevation model of the study area
  • Figure 12. Samples and thins sections of gneiss (a and b); biotite granite (c and d), epidote bearing tonalite (e and f), diorite (g and h) and basalt (i and j)
  • Figure 13. Lithological Map of the study area