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Congo Fan Neogene and Quaternary Sedimentation: Interplay of Riverine and Current Induced Deposition

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The South Atlantic in the Late Quaternary

Abstract

The incorporation of information regarding sedimentation rates and lithology from ODP Leg 175 Sites 1075, 1076 and 1077 into the analysis and interpretation of high-resolution seismic reflec-tion data led to the revision and refinement of a depositional model for the upper Congo Fan area presented earlier by Uenzelmann-Neben (1998). For four time slices since the Eocene (Late Oligocene - Miocene/Pliocene, Pliocene - 600 ky, 600 ky - ~160 ky, ~160 ky - Recent) the main sed-iment contributor to the upper fan was determined. Thus we can say that in the Late Paleogene input of sediments from the north dominated the area by either a south setting current or the Kouilou/ Niari River. This situation continued to the period Pliocene - 600 ky when southern sedi-ment sources (the Congo River and upwelling) became dominant with the material being deflected to the north by the Benguela Current. Upwelling as a sediment source on the upper fan became even more important after 600 ky while the main sediment load of the Congo River is guided to the middle and lower fan via the Congo Canyon.

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Uenzelmann-Neben, G., Miller, H. (2003). Congo Fan Neogene and Quaternary Sedimentation: Interplay of Riverine and Current Induced Deposition. In: Wefer, G., Mulitza, S., Ratmeyer, V. (eds) The South Atlantic in the Late Quaternary. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-18917-3_14

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  • DOI: https://doi.org/10.1007/978-3-642-18917-3_14

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-62354-7

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