(On the ' tectonic' significance of the alkaline acid complexes of Kahuzi and Biega, Kivu, Zaire).

The alkaline acid complexes of volcanic and plutonic rocks in the Kahuzi and Biega ranges (Kivu, Zaire) cannot be linked to the Precambrian orogeny. Neither do they show the primary magmatic evidence that would link them to the African Rift. Their Cambrian-Ordovician age seems to link them to a post PanAfrican decompressional phase. The aligning of many alkaline complexes of comparable age on the existing Rift could indicate that the latter was, in a way, drawn at the Cambrian. -English summary