Sedimentary evolution and effects of structural controls on the development of the Zambezi mixed turbidite-contourite system (Mozambique Channel, Southwest Indian Ocean) since the Oligocene

High-resolution multichannel seismic reflection data that spans significant parts of the Mozambique margin offshore Zambezi River permits study Oligocene to present architectural evolution turbidite system. In this time frame, five major depositional units are recognized evidence a widespread spatial and temporal occurrence both turbiditic contouritic sedimentation. They indicate sedimentary regime within system changed from dominantly aggradational during mainly erosional Miocene an interplay processes Plio-Quaternary. Different episodes incision, linked with Serpa Pinto, Angoche valleys, in upstream portion Fan highlight westward (anticlockwise) shift feeding axes. The central Valley was affected by progressive structural doming Miocene. dominance long-lasting generated continuous rise seabed led deep entrenchment Valley. This tectonically-controlled over-incision is believed be cause absence levees, has played important role stabilization valley at its current position. Finally, our revealed quasi-constant development contourite accumulations since Late occur most often synchronous offers unique insight into controls stages one largest systems world demonstrates especially susceptibility activity.