Tectonic movements of the Kibaran belt in Central Africa have been
subdivided into two main deformation phases: D1 (1265+ or -15 Ma)
and D2 (1189+ or -9 Ma), and a late-D2 shearing event called D'2
(1110+ or -38 Ma). In connection with these events, and using petrological
and geochronological data, five groups of granitoids and their geotectonic
settings have been defined: G1 I-type granite-gneiss and migmatitic
granites (syn-subduction), G2 I-type porphyroid granodiorites syn-first
phase of collision D1; G3 tourmaline monzogranites syn-D2 and symptomatic
of crustal thickening; G4 tin-bearing leucogranites late-D2 and,
subalkaline granites probably associated with D'2. In connection
with these tectonic and petrological data, three groups of mineralizations
can be defined: mineralizations linked with subduction: Au-Pt group,
associated with Ag, pyrite, pyrrhotite, chalcopyrite, lead and zinc
sulphides; mineralizations linked with collision: tin group (Sn-W-Au,
Nb-Ta, Be, Ce-Th..) with Sn associated with Au-W mineralization specific
for the northern part of the belt (Kivu, Rwanda, Burundi); mineralizations
linked with the late-shearing D'2: Ni, Ti, Cu, V, Fe, Co, Cr.