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Marchig, Vesna (1974): Geochemistry of recent sediments of the East African continental margin, Arabian Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.548421, Supplement to: Marchig, V (1974): Zur Geochemie rezenter Sedimente des Indischen Ozeans II. Arabisches Meer, afrikanischer Kontinentalrand und Vergleich mit dem indisch-pakistanischen Kontinentalrand. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C18, 1-34

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Abstract:
Chemical analyses have been carried out on 40 samples from the sediment surface and 210 samples from cores that were taken from the edge of the African continental block at the Arabian Sea (coasts of Somalia and Kenya, from Cape Guardafui to Mombasa) on the occasion of the Indian Ocean Expedition of the German research vessel "Meteor"
during the years 1964/65.
The carbonate content shows its maximum on the northern part of the continental shelf of Africa, where fossil reef debris furnish the detritic portion of carbonate. In the southern part of the continental shelf of Africa the portion of carbonate is low, as it is heavily diluted by the non-carbonatic detritus. It is also in the deep-sea that a lower carbonate content is encountered below the calcite compensation depth.
Trace elements in the carbonates: On the shelf and in its vicinity Sr and Mg are enriched. The enrichment has been brought about by the portion of reef debris, as this latter contains aragonite (enrichment of Sr) as well as high-magnesium calcite. The greatest part of the slope contains carbonates that are poor in trace elements and mainly made up of foraminifera (and of coccoliths). Below the carbonate compensation depth another enrichment of Mg takes place in the carbonates, which is probably due to a selective dissolution of calcite in comparison to dolomite. The iron and manganese contents of the carbonates are high (iron higher in coast proximity, manganese higher in the depth), but not genuine, as they come about in the course of the extraction of the carbonates as a result of the dissolution of authigenic Mn-Fe-minerals.
Non-carbonatic portion of the sediments: In coast proximity an enrichment of quartz comes about. Within the quartz-rich zone it is the elements V, Cr, Fe, Ti, and B that have been enriched in the non-carbonatic components. This enrichment must be attributed to an elevated content of heavy minerals. In the case of Ti and Fe the preliminary enrichment brought about by processes of lateritisation on the continent plays a certain role. Toward the deep-sea an enrichment of the elements Mn Ni, Cu, and Zn takes place; these enrichments must be explained by authigenic Mn-Fe-minerals. Within the Mn-rich zone a belt running parallel to the coast stands out that shows an increased Mn-enrichment. However, this increase in enrichment does not apply to the elements Ni, Cu, and Zn. It is probable that this latter increased enrichment comes about as a result of the migration of manganese to the sediment surface. (Within the sediments there prevail reductive conditions, in the presence of which Mn is capable of migration, whereas at the sediment surface its precipitation comes about under oxidizing conditions).
The quantity of organic matter mainly is dependent on grain size and on the rate of sedimentation. On the shelf an impoverishment of organic matter is to be encountered, as the sediments are coarse-grained. In the depth the impoverishment must be explained on the strength of a small rate of sedimentation. Between those two ranges organic substance is enriched. P and N show an enrichment in comparison to Corg with this applying all the more the smaller the absolute quantity of Corg is. In this particular case one has to do with an enrichment coming about during the diagenetic processes of organic matter.
A comparison with the sediments from the Indian and Pakistani continental border in Arabian Sea shows as follows: on the African continental border the coarse detrital material has been transported farther out to deep-sea, which has something to do with the greater inclination of the surface of sedimentation. Carbonate is found in greater abundance on the African side. Its chemical composition is influenced by reef-debris which is missing by Indian-Pakistani side. The content of organic matter is lower on the African side. Contrary to that, the enrichments of N and P compared to organic matter are of an equal order of magnitude on both sides of the Arabian Sea.
Coverage:
Median Latitude: 22.328022 * Median Longitude: 51.070627 * South-bound Latitude: -2.766000 * West-bound Longitude: 44.783000 * North-bound Latitude: 29.505000 * East-bound Longitude: 57.991000
Date/Time Start: 1964-12-20T00:00:00 * Date/Time End: 1965-04-10T00:00:00
Event(s):
GIK01103 (M1_294) * Latitude: 27.050000 * Longitude: 51.930000 * Date/Time: 1965-04-03T00:00:00 * Elevation: -53.0 m * Location: Persian Gulf * Campaign: M1 (IIOE - International Indian Ocean Expedition) * Basis: Meteor (1964) * Method/Device: Kasten corer (KAL)
GIK01111 (M1_302 11111-2) * Latitude: 28.061000 * Longitude: 50.888000 * Date/Time: 1965-04-05T00:00:00 * Elevation: -59.0 m * Recovery: 3.1 m * Location: Persian Gulf * Campaign: M1 (IIOE - International Indian Ocean Expedition) * Basis: Meteor (1964) * Method/Device: Gravity corer (Kiel type) (SL)
GIK01114 (M1_305 11114-2) * Latitude: 28.270000 * Longitude: 50.600000 * Date/Time: 1965-04-05T00:00:00 * Elevation: -59.0 m * Recovery: 2.2 m * Location: Persian Gulf * Campaign: M1 (IIOE - International Indian Ocean Expedition) * Basis: Meteor (1964) * Method/Device: Gravity corer (Kiel type) (SL)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
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Datasets listed in this publication series

  1. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01114, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509858
  2. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01116, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509859
  3. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01125, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509860
  4. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01128, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509861
  5. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01134, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509862
  6. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01135, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509863
  7. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01137, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509864
  8. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01138, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509865
  9. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01139, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509866
  10. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01143, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509867
  11. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01144, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509868
  12. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01146, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509869
  13. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01147, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509870
  14. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01148, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509871
  15. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of surface sediments of the Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509874
  16. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01152, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509877
  17. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01154, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509878
  18. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01155, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509879
  19. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01157, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509880
  20. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01161, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509881
  21. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01164, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509882
  22. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01165, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509883
  23. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core GIK01168, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509884
  24. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_105KK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509857
  25. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_114KK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.725424
  26. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_143KK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.726211
  27. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_162KK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509872
  28. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_167KK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509876
  29. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_169SK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509885
  30. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_170SK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509886
  31. Marchig, V (1974): Total organic carbon, nitrogen and phosphorus oxygen content of sediment core M1_179SK, Arabian Sea, African continental margin (Appendix). https://doi.org/10.1594/PANGAEA.509887