(a) Geological map of the Pan-African belt north of the Congo craton (after Toteu et al., 2022) showing the Sinassi location with yellow star and the main lithotectonic domains. CCSZ: Central Cameroonian Shear Zone; TBSZ: Tibati-Banyo Shear Zone; NBSZ: Ngoro-Belabo Shear Zone; CC: Congo Craton; AYD: Adamawa-Yade Domain; YD: Yaoundé Domain; WCD: Western Cameroon Domain. (b) Cameroon Domain Geological sketch map of Northern Cameroon and Southwestern Chad (modified after Toteu et al., 2001; Pinna et al., 1994; Toteu et al., 2004; Bouyo Houketchang et al., 2015, 2016). TBF: Tchollire-Banyo Fault; NP: Neoproterozoic; PP: Paleoproterozoic. Inset: location of the study area within the network of the Pan-African belts of West and Central Africa. Solid Square: Central African Fold Belt (CAfOB); polygon: study area (Fig. 2).