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Hartmann, Martin; Müller, Peter J; Suess, Erwin; van der Weijden, Cornelis H (1976): Chemistry of Late Quaternary sediments and their interstitial waters of sediment cores from the Nort-West African continental margin [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.548430, Supplement to: Hartmann, M et al. (1976): Chemistry of Late Quaternary sediments and their interstitial waters from the northwest African continental margin. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C24, 1-67

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Abstract:
In the sediments of the NW African continental margin the mainly biogenic carbonate constituents become increasingly diluted with terrigenous material as one approaches the coast, as indicated by the carbonate-CO2 content, the Al2O3/SiO2-ratios, and the presence of ammonia fixed to alumino-silicates, predominantly to illites. In the norther area of the investigation – off Cape Blanc and Cape Bojador . the terrigenous constituents are mainly quartz from the Sahara Desert, whereas in the south – off Senegal – more alumino-silicates as clay minerals are admixed with the carbonate constituents. The organic carbon content of the continental slope sediments off Senegal is higher than in samples of the continental rise or of the preservation of organic matter as a result of high production and relatively rapid sedimentation.
The zone of manganese-oxide enrichment follows the redox potential of + 330 mV from the surface (0-5 cm) into the sediments (20-30 cm deep) at 2000--3000 m and 3700 m of water depths, respectively. At shallower water depths, low redox potentials preclude deposition of manganese oxides and cause their mobilization from the sediments. About 1/3 of the total sedimentary Zn and 1/4 of the Cu is associated with the carbonate mineral fraction, probably in calcium phosphate overgrowths as a result of the mineralization of phosphorus-containing organic matter.
Besides the precipitation of calcium phosphate, the mineralization of organic matter mediated by bacterial sulfate reduction also results in calcium carbonate precipitation and the exchange of ammonia for potassium on illites. Because of these simultaneous reactions, the depth distribution of all mineralization constituents in the interstitial water can be determined using the actual molar carbon-to-nitrogen-to phosphorus ratios of the sedimentary organic matter. The amount of sulfide sulfur in this process indicates the predominance of bacterial sulfate reduction in the sediments off NW Africa. This process also preferentially decomposes nitrogen- and phosphorus-containing organic compounds so organic matter deficient in these elements is characteristic for the rapidly accumulating sediments than today, indicating there was increased production of organic carbon compounds and more favorable conditions of their preservations. During the last interglacial times conditions were similar to those to today. This differentiation with time has also been observed in sediments from the Argentine Basin and from slope off South India indicating perhaps world-wide environmental changes throughout Late Quaternary times.
Project(s):
Glacial Atlantic Ocean Mapping (GLAMAP2000)
Institute for Geosciences, Christian Albrechts University, Kiel (GIK/IfG)
Coverage:
Median Latitude: 19.711732 * Median Longitude: -17.933983 * South-bound Latitude: 15.316667 * West-bound Longitude: -21.970000 * North-bound Latitude: 26.838330 * East-bound Longitude: -15.053333
Date/Time Start: 1971-01-01T00:00:00 * Date/Time End: 1971-12-03T00:00:00
Event(s):
GIK12308-3 * Latitude: 26.645000 * Longitude: -15.053333 * Date/Time: 1971-10-31T00:00:00 * Elevation: -2085.0 m * Recovery: 0.4 m * Location: East Atlantic * Campaign: M25 * Basis: Meteor (1964) * Method/Device: Box corer (Reineck) (BCR)
GIK12309-2 * Latitude: 26.838330 * Longitude: -15.110000 * Date/Time: 1971-10-31T00:00:00 * Elevation: -2820.0 m * Recovery: 3.5 m * Location: East Atlantic * Campaign: M25 * Basis: Meteor (1964) * Method/Device: Kasten corer (KAL) * Comment: core was frozen
GIK12310-3 * Latitude: 23.498333 * Longitude: -18.716667 * Date/Time: 1971-11-02T00:00:00 * Elevation: -3076.0 m * Recovery: 0.4 m * Location: East Atlantic * Campaign: M25 * Basis: Meteor (1964) * Method/Device: Box corer (Reineck) (BCR)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
45 datasets

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Datasets listed in this publication series

  1. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Sedimentation rates of late Quaternary sediments from the NW African continental margin (Table 2). https://doi.org/10.1594/PANGAEA.511855
  2. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12310-3/4, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525734
  3. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12308-3, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526659
  4. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12308-3, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524297
  5. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12309-2, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526660
  6. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12309-2, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524298
  7. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12310-3/4, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526666
  8. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment cores GIK12310-3/4, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525762
  9. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12327-4/5, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526667
  10. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12327-4, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525754
  11. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12327-4/5, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525735
  12. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12328-4/5, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526668
  13. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12328-4/5, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525736
  14. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12328-4/5, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525763
  15. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12329-4/5, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526669
  16. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12329-4, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525755
  17. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12329-4/5, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525737
  18. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12331-1/2, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525738
  19. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12336-1, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525756
  20. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12336-1, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526662
  21. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12336-1, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524299
  22. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12337, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526674
  23. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12337-4/5, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525739
  24. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12337-4/5, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525764
  25. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12338-2, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525757
  26. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12338-2, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526663
  27. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12343-2, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525758
  28. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12343-2, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524300
  29. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12344-3/6, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526675
  30. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12344-3/6, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526661
  31. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12344-3/6, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525740
  32. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12344-3/6, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525765
  33. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12345-4, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525759
  34. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12345-4, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524301
  35. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12347-1/2, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526672
  36. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment cores GIK12347-1/2, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.525741
  37. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12347-1/2, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525766
  38. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12379-1, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525760
  39. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12379-1, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526664
  40. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12379-1, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524302
  41. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Chemical sediment analysis of sediment core GIK12392-1, NW African continental margin (Appendix Tab. 3). https://doi.org/10.1594/PANGAEA.525761
  42. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Interstitial water analysis of sediment core GIK12392-1, NW African continental margin (Appendix Tab. II). https://doi.org/10.1594/PANGAEA.526665
  43. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Lithological description of sediment core GIK12392-1, NW African continental margin (Appendix Tab. 1). https://doi.org/10.1594/PANGAEA.524303
  44. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Ammonia flux by moleculare diffusion transport in surface sediments of the NW African continental margin (Table 1). https://doi.org/10.1594/PANGAEA.526652
  45. Hartmann, M; Müller, PJ; Suess, E et al. (1976): Accumulation rates of organic carbon and biogenic carbonnate of sediment cores of the NW African continental margin (Table 3). https://doi.org/10.1594/PANGAEA.525769