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Jebel Tabaq is a prominent hill lying immediately to the southeast of Jebel Kakada (No. 155-00-069). Basement gneisses are exposed on the northern and southeastern margins and cut by an outer peralkaline quartz syenite, inside which is a peralkaline granite intrusion of 6x5 km. Both rock types contain perthite and a riebeckitic amphibole which is partly replaced by aegirine. Aenigmatite has been identified in the granite and zircon is a common accessory. Analyses of four rocks are given by Curtis and Lenz (1985).
CURTIS, P. and BRINKMANN, K. 1985. The geology of younger intrusive alkali complexes in the southwestern Nuba Mountains, Sudan. Geologisches Jahrbuch, 63: 3-41.CURTIS, P. and LENZ, H. 1985. Geological and geochronological investigations of selected alkali igneous complexes in the Nuba Mountains, southern Kordofan, Sudan. Geologisches Jahrbuch, 69: 3-24.
