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Bahr, André; Jiménez-Espejo, Francisco Jose; Kolasinac, Nada; Grunert, Patrick; Hernandéz-Molina, Francisco Javier; Röhl, Ursula; Voelker, Antje H L; Escutia, Carlota; Stow, Dorrik A V; Alvarez Zarikian, Carlos A; Hodell, David A (2014): X-ray fluorescence (XRF) scannings and grain size analysis at sites in the Gulf of Cádiz [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.831133, Supplement to: Bahr, A et al. (2014): Deciphering bottom current strength and paleoclimate signals from contourite deposits in the Gulf of Cádiz during the last 140 kyr: an inorganic geochemical approach. Geochemistry, Geophysics, Geosystems, 15(8), 3145-3160, https://doi.org/10.1002/2014GC005356

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Published: 2014-03-26 • DOI registered: 2014-08-28

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Abstract:
Contourites in the Gulf of Cádiz preserve a unique archive of Mediterranean Outflow Water (MOW) variability over the past 5.3 Ma. In our study we investigate the potential of geochemical data obtained by XRF scanning to decipher bottom current processes and paleoclimatic evolution at two different sites drilled through contourite deposits in the northern Gulf of Cadiz: Site U1387, which is bathed by the upper MOW core, and Site U1389, located more proximal to the Straits of Gibraltar. The lack of major downslope transport at both locations during the Pleistocene makes them ideal locations for the purpose of our study. The results indicate that the Zr/Al ratio, representing the relative enrichment of heavy minerals (zircon) over less dense alumosilicates under strong bottom current flow, is the most useful indicator for a semi-quantitative assessment of current strength. While most elements are biased by current-related processes, the bromine record, representing organic content, preserves the most pristine climate signal rather independent of grain size changes. Hence, Br can be used for chronostratigraphy and site-to-site correlation in addition to stable isotope stratigraphy. Based on these findings we reconstructed MOW variability for Marine Isotope Stages 1-5 using the Zr/Al ratio from Site U1387. The results reveal abrupt, millennial-scale variations of MOW strength during Greenland Stadials (GS) and Interstadials (GI) with strong MOW during GS and glacial Terminations and a complex behavior during Heinrich Stadials. Millennial-scale variability persisting during periods of poorly expressed GS/GI cyclicities implies a strong internal oscillation of the Mediterranean/North Atlantic climate system.
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 36.852705 * Median Longitude: -7.965292 * South-bound Latitude: 36.425000 * West-bound Longitude: -10.134000 * North-bound Latitude: 37.565000 * East-bound Longitude: -7.277000
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): Age model of IODP Site 339-U1387. https://doi.org/10.1594/PANGAEA.830945
  2. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): Total organic carbon of IODP Hole 339-U1387A and 339-U1387B. https://doi.org/10.1594/PANGAEA.833997
  3. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): Stable oxygen isotope measurements of IODP Hole 339-U1387B. https://doi.org/10.1594/PANGAEA.831036
  4. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): Sand content of IODP Hole 339-U1387B. https://doi.org/10.1594/PANGAEA.833996
  5. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): Grain size analysis of IODP Hole 339-U1387B. https://doi.org/10.1594/PANGAEA.833980
  6. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): X-ray fluorescence scanning data of sediment core MD01-2444. https://doi.org/10.1594/PANGAEA.831008
  7. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): X-ray fluorescence (XRF) scanning data (raw data, not normalized) from IODP Site U1387, 0-200 mcd. https://doi.org/10.1594/PANGAEA.831119
  8. Bahr, A; Jiménez-Espejo, FJ; Kolasinac, N et al. (2014): Raw (not normalized) X-ray fluorescence (XRF) scanning data of IODP Site U1389, 0-125 mcd. https://doi.org/10.1594/PANGAEA.831047