The Pan-African rocks of Um Taghir area encompass metavolcanics, synorogenic granites, Dokhan Volcanics, younger gabbros, post-collision granites, and they are cross-cut by dikes. The current granitoid rocks comprise older weakly deformed tonalite-granodiorites intruded by late tectonic undeformed granite including monzo-syenogranites and alkali feldspar granites. The weakly deformed tonalite-granodiorite is characterized by a restricted range of SiO 2 (65.78-69.43%) with reasonable enrichment in the LILE (Ba, Rb, and K 2 O), small negative Nb anomaly, and low Rb/Sr ratio which is the distinguishing of most of the synorogenic and subducted I-type granitoids in the Egyptian Nubian Shield (ANS). It is supposed that tonalitegranodiorite was formed by fractional crystallization of the Abu Furad metagabbro-diorite which is designated by their more or less lined trend on variation diagrams and their elements contents are ascribed to fractional crystallization of ferromagnesian minerals and feldspars. The monzo-syenogranites and alkali feldspar granites show SiO 2 ranges of 71.86-75.88% and 73.74-78.62%, respectively, formed through limited melting of the tonalite-granodiorite crust by rising of asthenosphere fluids with fractional crystallization of feldspars and amphibole. They are enhanced in LILE and Nb, formed in shallower depth, and categorized as A-type post-collision granite. On the basis of the geodynamic model, granite phases are consistent with the prevalent change from compressional toward post-collisional setting in the North Eastern Desert (NED). The monzosyenogranites were partially transformed into episyenitized rocks (episyenitized monzo-syenogranites) via desilicification, displaying SiO 2 contents of 65.44-66.36%, where gains and losses in mass are generally minimal (7.52 and 8.98%, respectively) and most other elements are close to the isocon line. Both older-and younger-granite types are in harmony with their formation by fractional crystallization process and are dependable with the dominant transitional tectonic setting in NED.