Figure 10. Geotectonic setting for felsic rocks and mafic rocks also plotted for comparison. (a) Rb vs. Y+Nb diagram [34] (b) Ce-Y-Nb discriminating diagram after [35]: A1= ﬁeld of Oceanic Island basalts, A2= ﬁeld of Post orogenic rocks or Island Arc basalts; (c) (Nb/Zr)N vs. Zr diagram [37]. Normalizing values from [31]. A= magmatic rocks related to subduction zone (VAG); B= Granitoids associated to collision zone (PCG); C= Alkaline rocks from intraplate zone (WPG); D= Syn-collisional granites. (d) Th/Hf vs. Ta/Hf diagram: different domains after [40,41], OA= Oceanic arcs, ACM= Active continental margins, WPVZ= Within plate volcanic zone, WPB= Within plate basalts, MORB= Mid-ocean ridge basalts; (e) Th/Ta vs. Yb diagram: discriminating lines after [38]; (f) Th/Ta vs. Ta/Yb diagram: line separating the two domains after [39] : Petrological and Geochemical Characteristics of the Cretaceous Ngaou Boh Anorogenic Complex (Adamawa Plateau, Cameroon Line): Preliminary Constraints : Science and Education Publishing

Figure 10. Geotectonic setting for felsic rocks and mafic rocks also plotted for comparison. (a) Rb vs. Y+Nb diagram [34] (b) Ce-Y-Nb discriminating diagram after [35]: A1= ﬁeld of Oceanic Island basalts, A2= ﬁeld of Post orogenic rocks or Island Arc basalts; (c) (Nb/Zr)_N vs. Zr diagram [37]. Normalizing values from [31]. A= magmatic rocks related to subduction zone (VAG); B= Granitoids associated to collision zone (PCG); C= Alkaline rocks from intraplate zone (WPG); D= Syn-collisional granites. (d) Th/Hf vs. Ta/Hf diagram: different domains after [40,41], OA= Oceanic arcs, ACM= Active continental margins, WPVZ= Within plate volcanic zone, WPB= Within plate basalts, MORB= Mid-ocean ridge basalts; (e) Th/Ta vs. Yb diagram: discriminating lines after [38]; (f) Th/Ta vs. Ta/Yb diagram: line separating the two domains after [39]

Journal of Geosciences and Geomatics. 2021, 9(4), 160-176 doi:10.12691/jgg-9-4-1