Figure 9. (a) K2O vs SiO2 diagram showing the limits of calc-alkaline and shoshonitic series by [37]; (b) Na2O+K2O-CaO vs SiO2 and A/NK vs ASI diagrams of [36]. I and S-type boundary (dash line adopted from [74]

From

Petrography and Geochemistry of the Somie-Ntem Granitoids (Western Cameroon-Domain): Implication on the Pan-African Evolution of the Central African Fold Belt

Mero Yannah, Juliana Amboh Tifang, Eric Martial Fozing, Yaya Fodoué, Armand Dongmo Kagou, Samuel Ndonyui Ayonghe

Journal of Geosciences and Geomatics. 2019, 7(5), 221-236 doi:10.12691/jgg-7-5-2