... of geochronology and isotope geochemistry, is that the central Sahara region is a large, coherent craton that was ‘highly remobilized’ during the Late Neoproterozoic amalgamation of Gondwana and referred to as the Saharan Metacraton. However, new data from the Guéra, Ouaddaï, and Mayo Kebbi massifs and the Lake...

...Figure 2. (a) Simplified regional geological framework map of North-Central Africa showing the boundary of the Saharan Metacraton (modified from Abdelsalam, Liegeois & Stern, 2002 ). Location of the Doba basin drill hole and Mayo Kebbi Massif shown...

... overprinted by Pan African deformation ( Kusnir and Moutaye, 1997 ). These rock units are in turn intruded by widespread undeformed plutons that are amalgamated into batholiths. Foliated rocks dominate five main massifs ( Figure 2 ): Tibesti in the north; Ouaddaï in the east; Guéra in the centre; Mayo Kebbi...

... of such a continental back arc basin. 750–600 Ma arc magmatism in the CAOfB is evidenced by juvenile mafic and intermediate rocks forming the Mayo Kebbi massif ( Fig. 1 ) interpreted as an island arc ( Penaye et al. , 2006 ; Isseini, 2011 ) and calc-alkaline batholiths associated with exhumed, often migmatitic...

... African Rift System (CARS). The Chad Basin is touched at its border by four major Precambrian massifs: the Mayo-Kebbi in the southwest, the Guéra in the south-center, the Quaddaï in the east, and the Tibesti in the north (Figure  1a and 1b ). Geochronology has been obtained for samples from...