Abstract
The granitic rocks of N Cameroon show complex characteristics of pan-African granitization, with some granite massifs, some syenite massifs and some of mixed granite-syenite. Geochemical analysis shows a double evolution trend identical to those of the younger granites of Cameroon and Nigeria, implying possible N-S migration of atectonic granitic intrusions in the mobile zone of central Africa. Rb/Sr ratios yield information on fractional crystallization processes; chemical analyses of various granitic rocks are presented.