Gulf of Guinea continental slope and Congo (Zaire) deep-sea fan: Sr-Pb isotopic constraints on sediments provenance from ZaiAngo cores

The differences observed between present-day samples from Congo channel and from the terminal depositional lobe suggest a segregation of the sand along the channel during the transit which creates a Pb isotopic fractionation. Therefore, the comparison between Sr and Pb isotopes shows a strong discrimination of Pb according to sedimentation processes while Sr isotopes seem directly influenced by the coastal rivers contributions.