Abstract
Geological and geophysical data acquisitions by Ifremer and Total since 1992 (Guiness cruises, 1992-1993, and ZaiAngo cruises, 1998-2000) on the Zaire (Congo) turbidite system revealed a well-organized Quaternary architecture governed by avulsion processes (Savoye et al., 2000; Droz et al., 2003). Active avulsion process throughout the Quaternary resulted in more than 76 channel/levee systems, grouped into 3 individual fans (Northern, Southern and Axial Fan from the oldest to the youngest). In the objective to contribute to a sharper understanding of the avulsion phenomenon and to be finally able to anticipate the sediment distribution in the turbidite systems, we focused part of our research efforts on the avulsion phenomenon that governs the architecture of fans and therefore the sediment partitioning. Two main aspects of this process will be addressed in this presentation: (1) the detailed architecture and evolution of a bifurcation point in the Axial Fan (called A21/22, from the initial channel A21 to the new channel A22) and (2) the spatial and temporal evolution of the bifurcation points at the scale of the whole fan.
Published Version
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