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Weldeab, Syee; Emeis, Kay-Christian; Hemleben, Christoph; Schmiedl, Gerhard; Schulz, Hartmut (2003): Geochemistry of sediments cores in the Mediterranean Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.704279, Supplement to: Weldeab, S et al. (2003): Spatial productivity variations during formation of sapropels S5 and S6 in the Mediterranean Sea: Evidence from Ba contents. Palaeogeography, Palaeoclimatology, Palaeoecology, 191(2), 169-190, https://doi.org/10.1016/S0031-0182(02)00711-3

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Abstract:
We investigated five time-equivalent core sections (180-110 kyr BP) from the Balearic Sea (Menorca Rise), the easternmost Levantine Basin and southwest, south, and southeast of Crete to reconstruct spatial patterns of productivity during deposition of sapropels S5 and S6 in the Mediterranean Sea. Our indicators are Ba, total organic carbon and carbonate contents. We found no indications of Ba remobilization within the investigated core intervals, and used the accumulation rate of biogenic Ba to compute paleoproductivity. Maximum surface water productivity (up to 350 g C/m2/yr) was found during deposition of S5 (isotope stage 5e) but pronounced spatial variability is evident. Coeval sediment intervals in the Balearic Sea show very little productivity change, suggesting that chemical and biological environments in the eastern and western Mediterranean basins were decoupled in this interval. We interpret the spatial variability as the result of two different modes of nutrient delivery to the photic zone: riverderived nutrient input and shoaling of the pycnocline/nutricline to the photic zone. The productivity increase during the formation of S6 was moderate compared to S5 and had a less marked spatial variability within the study area of the eastern Mediterranean Sea. Given that S6 formed during a glacial interval, glacial boundary conditions such as high wind stress and/or cooler surface water temperatures apparently favored lateral and vertical mixing and prevented the development of the spatial gradients within the Eastern Mediterranean Sea (EMS) observed for S5. A non-sapropel sediment interval with elevated Ba content and depleted 18O/16O ratios in planktonic foraminifer calcite was detected between S6 and S5 that corresponds to the weak northern hemisphere insolation maximum at 150 kyr. At this time, productivity apparently increased up to five times over surrounding intervals, but abundant benthic fauna show that the deep water remained oxic. Following our interpretation, the interval denotes a failed sapropel, when a weaker monsoon did not force the EMS into permanent stratification. The comparison of interglacial and glacial sapropels illustrates the relevance of climatic boundary conditions in the northern catchment in determining the facies and spatial variability of sapropels within the EMS.
Related to:
Weldeab, Syee (2001): Geochemical investigations of surface and core sediments from the Eastern Mediterranean Sea: Implication for productivity changes and climate conditions in the catchment areas during sapropel formation. Tübinger Mikropaläontologische Mitteilungen, 26, 107 pp
Project(s):
Coverage:
Median Latitude: 34.969681 * Median Longitude: 23.549405 * South-bound Latitude: 32.608700 * West-bound Longitude: 4.023000 * North-bound Latitude: 38.988000 * East-bound Longitude: 34.149000
Date/Time Start: 1995-03-17T20:14:00 * Date/Time End: 1999-04-18T00:00:00
Event(s):
160-964A * Latitude: 36.260300 * Longitude: 17.749700 * Date/Time Start: 1995-03-17T20:14:00 * Date/Time End: 1995-03-18T21:30:00 * Elevation: -3658.0 m * Penetration: 101.8 m * Recovery: 106.12 m * Location: Eastern Basin * Campaign: Leg160 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 11 core; 101.8 m cored; 0 m drilled; 104.2 % recovery
160-966A * Latitude: 33.796700 * Longitude: 32.701600 * Date/Time Start: 1995-03-27T05:58:00 * Date/Time End: 1995-03-27T21:46:00 * Elevation: -927.0 m * Penetration: 106.8 m * Recovery: 73.21 m * Location: Eastern Basin * Campaign: Leg160 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 106.8 m cored; 0 m drilled; 68.5 % recovery
160-969E * Latitude: 33.841100 * Longitude: 24.883100 * Date/Time Start: 1995-04-16T17:55:00 * Date/Time End: 1995-04-16T15:20:00 * Elevation: -2201.0 m * Penetration: 97.9 m * Recovery: 100.23 m * Location: Eastern Basin * Campaign: Leg160 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 11 core; 97.9 m cored; 0 m drilled; 102.4 % recovery
Size:
19 datasets

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Datasets listed in this publication series

  1. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): (Table 2) Barium concentrations of surface sediments in the Mediterranean Sea. https://doi.org/10.1594/PANGAEA.704300
  2. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Age and stable oxygen isotope ratios of Globigerinoides ruber from ODP Hole 160-969E in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.79182
  3. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Age and stable oxygen isotope ratios of Globigerinoides ruber from sediment core M40/4_KL51 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69822
  4. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Age and stable oxygen isotope ratios of Globigerinoides ruber from sediment core M40/4_SL67 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69824
  5. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Age and stable oxygen isotope ratios of Globigerinoides ruber from sediment core M40/4_SL71 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69825
  6. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Age and stable oxygen isotope ratios of Globigerinoides ruber from sediment core M40/4_SL87 in the western Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69826
  7. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Age and stable oxygen isotope ratios of Globigerinoides ruber from sediment core M44/3_KL83 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69823
  8. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Biogenic barium concentrations and productivity reconstruction of ODP Hole 160-969E in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.79181
  9. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Biogenic barium concentrations and productivity reconstruction of sediment core M40/4_KL51 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69828
  10. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Biogenic barium concentrations and productivity reconstruction of sediment core M40/4_SL671 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69830
  11. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Biogenic barium concentrations and productivity reconstruction of sediment core M40/4_SL71 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69831
  12. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Biogenic barium concentrations and productivity reconstruction of sediment core M40/4_SL87 in the western Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69832
  13. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Biogenic barium concentrations and productivity reconstruction of sediment core M44/3_KL83 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69829
  14. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Calcium carbonate and total organic carbon of ODP Hole 160-969E in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.79183
  15. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Calcium carbonate and total organic carbon of sediment core M40/4_KL51 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69858
  16. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Calcium carbonate and total organic carbon of sediment core M40/4_SL67 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69915
  17. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Calcium carbonate and total organic carbon of sediment core M40/4_SL71 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69917
  18. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Calcium carbonate and total organic carbon of sediment core M40/4_SL87 in the western mediterranean Sea. https://doi.org/10.1594/PANGAEA.69920
  19. Weldeab, S; Emeis, K-C; Hemleben, C et al. (2003): Calcium carbonate and total organic carbon of sediment core M44/3_KL83 in the eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.69859