...Figure 3. Simplified geologic map of central Chad showing outcrop area of the Ouaddaï (Darfur) and Guéra massifs, with locations of samples described in this paper. ...

... 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...

... ]. The uniqueness of the Blair River inlier relative to the peri-Gondwanan terranes (i.e., Avalon, Gander, and Meguma) in the northern Appalachians suggests that it may represent a fragment of Laurentian basement and that the Red River anorthosite is interpreted to be correlative with Proterozoic massif-type...

... represent inherited cores while the lowermost Cambrian age reflects igneous crystallization. A late Ediacaran igneous activity is known in the CAfOB and especially in the neighboring Guera Massif ( Shellnutt et al. , 2019 ) where inherited ∼ 1 Ga cores have also been found ( Shellnutt et al. , 2017...

..., 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 the Guéra massif and basement rocks of the Doba Basin of southern Chad ( Shellnutt et al., 2017 ). The same publication attempted to give a timing...

... rocks. The Precambrian rocks are found in the Tibesti Mountains north of N’Djamena, the Ouddai Massif at the eastern border and central areas of Chad, the Guera Massif in the centre and the Yade and Mayo Kebbi massifs in the south ( Fig. 2 a). The Tibesti, Ouddai and Guerra massifs...

...-feldspar granites of the Mandira Granite Massif, in the post-collisional A-type Graciosa Province, S-SE Brazil. Magmatic calcic (ferro-ferri-hornblende and hastingsite) amphiboles occur in the metaluminous syenogranites, whereas calcic (ferro-edenite), sodic–calcic (ferro-ferri-winchite) and sodic...