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Just, Janna; Dekkers, Mark J; von Dobeneck, Tilo; van Hoesel, Annelies; Bickert, Torsten (2012): Rock magnetic records and geochemical methods of sediment cores off NW Africa [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788167, Supplement to: Just, J et al. (2012): Signatures and significance of aeolian, fluvial, bacterial and diagenetic magnetic mineral fractions in Late Quaternary marine sediments off Gambia, NW Africa. Geochemistry, Geophysics, Geosystems, 13, Q0AO02, https://doi.org/10.1029/2012GC004146

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Abstract:
Two gravity cores retrieved off NW Africa at the border of arid and subtropical environments (GeoB 13602-1 and GeoB 13601-4) were analyzed to extract records of Late Quaternary climate change and sediment export. We apply End Member (EM) unmixing to 350 acquisition curves of isothermal remanent magnetization (IRM). Our approach enables to discriminate rock magnetic signatures of aeolian and fluvial material, to determine biomineralization and reductive diagenesis. Based on the occurrence of pedogenically formed magnetic minerals in the fluvial and aeolian EMs, we can infer that goethite formed in favor to hematite in more humid climate zones. The diagenetic EM dominates in the lower parts of the cores and within a thin near-surface layer probably representing the modern Fe**2+/Fe**3+ redox boundary. Up to 60% of the IRM signal is allocated to a biogenic EM underlining the importance of bacterial magnetite even in siliciclastic sediments. Magnetosomes are found well preserved over most of the record, indicating suboxic conditions. Temporal variations of the aeolian and fluvial EMs appear to faithfully reproduce and support trends of dry and humid conditions on the continent. The proportion of aeolian to fluvial material was dramatically higher during Heinrich Stadials, especially during Heinrich Stadial 1. Dust export from the Arabian-Asian corridor appears to vary contemporaneous to increased dust fluxes on the continental margin of NW Africa emphasizing that melt-water discharge in the North Atlantic had an enormous impact on atmospheric dynamics.
Project(s):
Center for Marine Environmental Sciences (MARUM)
Coverage:
Median Latitude: 13.248944 * Median Longitude: -17.890800 * South-bound Latitude: 12.434333 * West-bound Longitude: -18.004833 * North-bound Latitude: 13.545167 * East-bound Longitude: -17.849333
Date/Time Start: 2009-03-16T11:31:00 * Date/Time End: 2009-03-18T10:45:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
15 datasets

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Datasets listed in this publication series

  1. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Age model of sediment core GeoB13601-4. https://doi.org/10.1594/PANGAEA.788131
  2. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Isothermal remanent magnetization (IRM) acquisition curves of sediment core GeoB13601-4 (external). https://doi.org/10.1594/PANGAEA.788141
  3. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Isothermal remanent magnetization (IRM) acquisition curves of sediment core GeoB13601-4 (in-line). https://doi.org/10.1594/PANGAEA.788143
  4. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Rock magnetic properties of sediment core GeoB13601-4. https://doi.org/10.1594/PANGAEA.788154
  5. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Age model of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788132
  6. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Bulk components of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788133
  7. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Curie balance of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788136
  8. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Stable isotope analyses of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788137
  9. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Warming curves after in-field cooling of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788140
  10. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Isothermal remanent magnetization (IRM) acquisition curves of sediment core GeoB13602-1 (external). https://doi.org/10.1594/PANGAEA.788142
  11. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Isothermal remanent magnetization (IRM) acquisition curves of sediment core GeoB13602-1 (in-line). https://doi.org/10.1594/PANGAEA.788144
  12. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Rock magnetic properties of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788157
  13. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): SIRM warming experiments of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788158
  14. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): Zero-field cooling (ZFC) experiments of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788159
  15. Just, J; Dekkers, MJ; von Dobeneck, T et al. (2012): (Table 1) Radiocarbon ages of sediment core GeoB13602-1. https://doi.org/10.1594/PANGAEA.788162