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This paper reviews the available gravity, heat flow and seismolocal data to better understand recent rifting mechanisms in the southeast of the Democratic Republic of Congo and Zambia. In previous studies the compilation of gravity data led to define a low regional Bouguer anomaly of −140 mgal amplitude with NE-SW axis parallel to the trend of the young rifts Upemba and Mwero in the Democratic Republic of Congo, Luano, Luangwa and Lukusashi in Zambia. Analysis of relationships between Bouguer anomaly and elevation reveals for the whole region an isostatic disequilibrium related to a 2-D model of low-density asthenosphere (−0.06 g/cm3) implying thin lithosphere thick of 123 km with associated rifting. Heat flow results, structural and seismological data contribute to support the rifting model in which an active thermal disturbance is occurring in the form of an actively upwelling stream of asthenospheric material which began during the Early Cenozoic when Arabia rifted from Africa and the East Africa Rift system developed. A new view of the rifting geodynamics is presented showing that the main continental break up of Africa south of 10 S may occur in future through the southeast of the Democratic Republic of Congo and Zambia rifting evolution dependent on the extent of the upwelling of the asthenosphere.

Geophysical evidences of continental break up in the southeast of the Democratic Republic of Congo and Zambia (Central Africa)