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Nizou, Jean; Hanebuth, Till J J; Heslop, David; Schwenk, Tilmann; Palamenghi, Luisa; Stuut, Jan-Berend W; Henrich, Rüdiger (2010): Grain-size distribution, sedimentation rate and x-ray fluorescence data of four sediment cores off the Senegal River estuary [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.730121, Supplement to: Nizou, J et al. (2010): The Senegal River mud belt: A high-resolution archive of paleoclimatic change and coastal evolution. Marine Geology, 278(1-4), 150-164, https://doi.org/10.1016/j.margeo.2010.10.002

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Abstract:
Fine-grained sediment depocenters on continental shelves are of increased scientific interest since they record environmental changes sensitively. A north-south elongated mud depocenter extends along the Senegalese coast in mid-shelf position. Shallow-acoustic profiling was carried out to determine extent, geometry and internal structures of this sedimentary body. In addition, four sediment cores were retrieved with the main aim to identify how paleoclimatic signals and coastal changes have controlled the formation of this mud depocenter.
A general paleoclimatic pattern in terms of fluvial input appears to be recorded in this depositional archive. Intervals characterized by high terrigenous input, high sedimentation rates and fine grain sizes occur roughly contemporaneously in all cores and are interpreted as corresponding to intensified river discharge related to more humid conditions in the hinterland. From 2750 to 1900 and from 1000 to 700 cal a BP, wetter conditions are recorded off Senegal, an observation which is in accordance with other records from NW-Africa. Nevertheless, the three employed proxies (sedimentation rate, grain size and elemental distribution) do not always display consistent inter-core patterns. Major differences between the individual core records are attributed to sediment remobilization which was linked to local hydrographic variations as well as reorganizations of the coastal system.
The Senegal mud belt is a layered inhomogeneous sedimentary body deposited on an irregular erosive surface. Early Holocene deceleration in the rate of the sea-level rise could have enabled initial mud deposition on the shelf. These favorable conditions for mud deposition occur coevally with a humid period over NW-Africa, thus, high river discharge. Sedimentation started preferentially in the northern areas of the mud belt. During mid-Holocene, a marine incursion led to the formation of an embayment. Afterwards, sedimentation in the north was interrupted in association with a remarkable southward shift in the location of the active depocenter as it is reflected by the sedimentary architecture and confirmed by radiocarbon dates. These sub-recent shifts in depocenters location are caused by migrations of the Senegal River mouth. During late Holocene times, the weakening of river discharge allowed the longshore currents to build up a chain of beach barriers which have forced the river mouth to shift southwards.
Related to:
Nizou, Jean (2009): The Senegal mud-belt depocenter (NW-Africa) - an archive for climatic changes, coastal dynamics and shelf organization over the Holocene -. PhD Thesis, Elektronische Dissertationen an der Staats- und Universitätsbibliothek Bremen, Germany, urn:nbn:de:gbv:46-diss000118171
Project(s):
Center for Marine Environmental Sciences (MARUM)
Coverage:
Median Latitude: 15.974000 * Median Longitude: -16.682950 * South-bound Latitude: 15.683333 * West-bound Longitude: -16.731333 * North-bound Latitude: 16.281667 * East-bound Longitude: -16.650833
Date/Time Start: 2005-06-13T09:28:00 * Date/Time End: 2005-06-13T21:02:00
Event(s):
GeoB9502-4 (287) * Latitude: 16.281667 * Longitude: -16.670000 * Date/Time: 2005-06-13T09:28:00 * Elevation: -63.0 m * Recovery: 5.9 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 590 cm
GeoB9503-3 (288) * Latitude: 16.066500 * Longitude: -16.650833 * Date/Time: 2005-06-13T12:39:00 * Elevation: -49.0 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 43-47 cm
GeoB9503-5 (288) * Latitude: 16.066500 * Longitude: -16.652500 * Date/Time: 2005-06-13T14:31:00 * Elevation: -50.0 m * Recovery: 7.92 m * Campaign: M65/1 * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL) * Comment: geology, 792 cm
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
13 datasets

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Datasets listed in this publication series

  1. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Grain-size distribution of the terrigenous fraction from sediment core GeoB9502-4. https://doi.org/10.1594/PANGAEA.729796
  2. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Sedimentation rate of sediment core GeoB9502-4. https://doi.org/10.1594/PANGAEA.729802
  3. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): X-ray fluorescence data of sediment core GeoB9502-4. https://doi.org/10.1594/PANGAEA.729814
  4. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Grain-size distribution of the terrigenous fraction from sediment core GeoB9503-5. https://doi.org/10.1594/PANGAEA.729797
  5. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Sedimentation rate of sediment core GeoB9503-5. https://doi.org/10.1594/PANGAEA.729804
  6. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): X-ray fluorescence data of sediment core GeoB9503-5. https://doi.org/10.1594/PANGAEA.729822
  7. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Grain-size distribution of the terrigenous fraction from sediment core GeoB9504-3. https://doi.org/10.1594/PANGAEA.729798
  8. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Sedimentation rate of sediment core GeoB9504-3. https://doi.org/10.1594/PANGAEA.729805
  9. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): X-ray fluorescence data of sediment core GeoB9504-3. https://doi.org/10.1594/PANGAEA.729823
  10. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): Grain-size distribution of the terrigenous fraction from sediment core GeoB9505-4. https://doi.org/10.1594/PANGAEA.729799
  11. Nizou, J; Schwenk, T; Palamenghi, L et al. (2010): Sedimentation rate of sediment core GeoB9505-4. https://doi.org/10.1594/PANGAEA.729807
  12. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): X-ray fluorescence data of sediment core GeoB9505-4. https://doi.org/10.1594/PANGAEA.729824
  13. Nizou, J; Hanebuth, TJJ; Heslop, D et al. (2010): (Table 3) Radiocarbon measurements and age calibrations of sediment cores from the Senegal River mud belt. https://doi.org/10.1594/PANGAEA.756942