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Möbius, Jürgen; Lahajnar, Niko; Emeis, Kay-Christian (2011): Geochemistry on Holocene sediments from the Mediterranean [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758621, Supplement to: Möbius, J et al. (2010): Diagenetic control of nitrogen isotope ratios in Holocene sapropels and recent sediments from the Eastern Mediterranean Sea. Biogeosciences, 7, 3901-3914, https://doi.org/10.5194/bg-7-3901-2010

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Abstract:
The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low d15N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to enhanced organic matter preservation under anoxic conditions. In order to evaluate these two hypothesis we have determined Ba/Al ratios, amino acid composition, N and organic C concentrations and d15N in sinking particles, surface sediments, eight spatially distributed core records of the youngest sapropel S1 (10-6 ka) and older sapropels (S5, S6) from two locations. These data suggest that (i) temporal and spatial variations in d15N of sedimentary N are driven by different degrees of diagenesis at different sites rather than by changes in N-sources or primary productivity and (ii) present day TOC export production would suffice to create a sapropel like S1 under conditions of deep-water anoxia. This implies that both enhanced TOC accumulation and d15N depletion in sapropels were due to the absence of oxygen in deep waters. Thus preservation plays a major role for the accumulation of organic-rich sediments casting doubt on the need of enhanced primary production for sapropel formation.
Project(s):
Integrierte Analyse zwischeneiszeitlicher Klimadynamik (INTERDYNAMIK)
Funding:
German Research Foundation (DFG), grant/award no. 25575884: Integrierte Analyse zwischeneiszeitlicher Klimadynamik
Coverage:
Median Latitude: 35.166849 * Median Longitude: 23.466217 * South-bound Latitude: 31.606667 * West-bound Longitude: -4.317333 * North-bound Latitude: 42.428167 * East-bound Longitude: 34.649200
Date/Time Start: 1998-01-22T02:36:00 * Date/Time End: 2007-02-02T15:50:00
Event(s):
GeoB7704-1 (80) * Latitude: 32.088333 * Longitude: 33.625000 * Date/Time: 2002-02-12T22:30:00 * Elevation: -996.0 m * Recovery: 0.24 m * Location: Eastern Mediterranean, Continental slope off Israel * Campaign: M52/2 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 8/8, 4/4 tubes filled, (2xd13C,1xd18O)
GeoB7705-1 (82) * Latitude: 32.418333 * Longitude: 33.298333 * Date/Time: 2002-02-13T06:48:00 * Elevation: -1199.0 m * Recovery: 0.2 m * Location: Eastern Mediterranean, Continental slope off Israel * Campaign: M52/2 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 8/8, 4/4 tubes filled, (2xd13C,1xd18O)
GeoB7706-2 (85) * Latitude: 31.606667 * Longitude: 34.115000 * Date/Time: 2002-02-14T06:09:00 * Elevation: -372.0 m * Recovery: 0.38 m * Location: Eastern Mediterranean, Continental slope off Israel * Campaign: M52/2 * Basis: Meteor (1986) * Method/Device: MultiCorer (MUC) * Comment: 7/8, 4/4 tubes filled (2xd13C,1xd18O)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Möbius, J; Lahajnar, N; Emeis, K-C (2015): Chemical composition of Holocene sediment core M40/4_SL71 from the Eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.843934
  2. Möbius, J; Lahajnar, N; Emeis, K-C (2015): Chemical composition of Holocene sediment core M51/3_562 from the Eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.843932
  3. Möbius, J; Lahajnar, N; Emeis, K-C (2015): Chemical composition of Holocene sediment core M51/3_563 from the Eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.843933
  4. Möbius, J; Lahajnar, N; Emeis, K-C (2011): Chemical composition of Holocene sediment core M51/3_569-3 from the Eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.758620
  5. Möbius, J; Lahajnar, N; Emeis, K-C (2015): Chemical composition of Holocene sediment core M51/3_601 (SL152) from the Eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.843935
  6. Möbius, J; Lahajnar, N; Emeis, K-C (2010): Chemical composition of surface sediment samples from the Eastern Mediterranean Sea. https://doi.org/10.1594/PANGAEA.754732