The Mesoproterozoic Kibaran belts host large amounts of mineral resources such as cassiterite, wolframite, gold, and columbite-group minerals (“coltan”), all of them in high demand for new technologies and related industries. Most of these mineral occurrences are linked to the latest Mesoproterozoic to early Neoproterozoic G4 granitoid intrusions, also termed “tin(-bearing) granites”. Three main parts constitute the Kibaran belts: the Kibaride Belt (KIB) in the south, the Karagwe-Ankole Belt (KAB) in the east, and the Kivu Belt (KVB) in the west. Geological detail concerning the metallogeny of the KVB, which hosts large parts of these mineral resources, is very sparse. Previously, there was an assumed time gap of about 200 Ma between the formation of the last Kibaran terranes (1250 to 1200 Ma) and the emplacement of the G4 granites (ca. 1050 to 970 Ma), which generated the main mineralizations. Recent studies dated the last Kibaran tectono-thermal events younger than 1120 to 1110 Ma, which gave evidence for a drastic reduction in this time gap. Thus, the two newly recognized tectono-thermal events have likely contributed to the remobilization of older mineralized granites. These new data allow us to link the G4 granitoids and the associated mineralizations with the terminal Kibaran orogeny. However, the G4 emplacement and its relationships with older granites, with their host rocks and associated mineralizations, are not yet understood. Here, the main occurrences of the KVB are reviewed, and comparisons with similar mineralizations in the adjacent KAB are undertaken to improve our understanding on these complex relationships.

The Itombwe belt is a North-South oriented structure which belongs to the Neoproterozoic rift system of central Africa including at least four troughs folded during the Pan-African orogeny. This Neoproterozoic rift located inside the Congo craton is tectonically dependent of the far away (400 to 800 km) Pan-African belts surrounding the Congo Craton. The N-S opening of this Itombwe structure around 662 Ma and its folding by 550 Ma is linked to the eastern Pan-African Mozambique belt and to the Southern Lufilian belt (Katanga). This study includes geological observations from the thin section to the regional scale deformations. The model is compared to similar regional rift systems such as the Tertiary Mid-European and the East African rifts. An overall geodynamic explanation based on field studies and radiometric data is proposed.