Figure 7. Alumina index diagram (Molar Al2O3/ (CaO + Na2O+K2O) vs Al2O3/ (Na2O + K2O) for the Tamkoro-Bossangoa granites (a) and (b) comparison between Tamkoro-Bossangoa, eastern and NE Brazil granitoids. Symbols as in Figure 3. Boundary between I- and S-type according to Chappell and White [36]

From

Paleoproterozoic Synkinematic Magnesian High-K Magmatism from the Tamkoro-Bossangoa Massif, along the Bossangoa-Bossembele Shear Zone in North-Western Central African Republic

P.E.Y. Danguene, T. Ngnotue, S. Ganno, J. Biandja, B. Kankeu, J.P. Nzenti

Journal of Geosciences and Geomatics. 2014, 2(4), 151-164 doi:10.12691/jgg-2-4-3