ABSTRACT
The Red Sea Hills of Sudan are part of the Arabian-Nubian Shield which evolved during the Upper Proterozoic Pan-African orogeny by formation of island arcs and contemporaneous to subsequent accretion of several of these arc terranes onto the African craton. The ophiolite decorated Nakasib suture zone in the central Red Sea Hills is a broad, ENE-WSW striking, highly deformed shear zone which separates the Haya terrane in the south from the Gebeit terrane in the north and thus marks a convergent Pan-African plate margin. This chapter presents results of geochemical and geochronological investigations on granitoid rocks which intruded along the Nakasib suture zone. The oldest granitoid association of the area is a calc-alkaline, low K tonalitic series. The rocks form huge, batholitic intrusions; although they are affected by mild metamorphism, they are not pervasively deformed. The suite is composed of diorites, quartz-diorites and tonalites with subordinate amounts of gabbros and granodiorites.
