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Petrography and Geochemical Features of Dolerites Dykes from Fell (Adamawa Plateau, Cameroon-Central Africa)

Okomo AtoubaL.C., Fagny M.A., Kada B., Edima Yana R.W., Ngougoure M.S., Kamgang Kabeyene B.V

Journal of Geosciences and Geomatics. 2021, 9(2), 74-82 doi:10.12691/jgg-9-2-4
  • Figure 1. A: Location of Cameroon in Central Africa, B: Geological map of Adamawa plateau after [14], C: Geological sketch map of Fell area
  • Figure 2. Representative of Fell dyke outcrop at Kinta stream composed of angular blocks of dolerite lavas (A), containing feldspars and mafic phases in a greenish grey matrix (B) and at Barka along N70 direction (C), containing feldspar and pyrite crystals in dark green matrix (D)
  • Figure 3. Photomicrographs showing main characteristics of dolerite textures of Fell dolerites
  • Figure 4. T.A.S. diagram for Fell dolerites after [16]. Pink dashed line separates alkaline and sub alkaline fields after [17]. Analyses recalculated to 100 LOI free
  • Figure 5. Composition of Fell dolerites plotted in TiO2 vs Y/Nb diagram after [18]
  • Figure 6. Fell dolerite in triangular diagrams. (A). Tb-Th-Ta triangle after [19], BAB: Back Arc Basin Basalts, CT: Continental Tholeiites; 1. Orogenic Basalts, 2. Continental Tholeiites and Arc Basin Basalts and 3. Non orogenic Basalts. (B): La-Y-Nb [20]: 1: Arcrelated orogenic series, 2: Intermediate domain of continental tholeiites, 3: Anorogenic series of oceanic ridges and intraplate alkaline basalts, (C): Th-Hf-Ta [21]: A: N-type MORB, B: E-type MORB and tholeiitic within-plate basalts and differentiates, C: Alkaline within-plate basalts and differentiates, D: Destructive plate-margin basalts and differentiates
  • Figure 7. A: Multielements spider diagram (normalization after [15]) and (B) REE of Fell dolerites
  • Figure 8. Fracturing map and lineaments strikes of Fell locality