ABSTRACT
J. Moya is located about 250 km SSE of Khartoum and comprises charnockites, enderbites and granites in an area of basement complex bounded by the blue Nile and white Nile rift basins of the east and west, respectively. Stern and Dawoud suggested that the charnockites, enderbites and granites of J. Moya are all part of a deep seated igneous complex with no evidence of the involvement of pre-Late Precambrian crust. The charnockites of J. Moya are bound to the south by a transition zone in which a gradual change from charnockite to granite is evident. There are shear zones of few centimeters to several meters in the charnockite with marked bleaching of charnockite to granite looking rock. These shear zones increase in intensity towards the transition zone and there is a close relationship between shearing and the development of the transition zone, suggesting the derivation of the granite from charnockite. Throughout the charnockite body xenoliths of enderbite are common.
