Passier, Hilde F; Middelburg, Jack J; de Lange, Gert J; Böttcher, Michael Ernst (1999): Modes of sapropel formation in the eastern Mediterranean: some constraints based on pyrite properties [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.758840, Supplement to: Passier, HF et al. (1999): Modes of sapropel formation in the eastern Mediterranean: some constraints based on pyrite properties. Marine Geology, 153(1-4), 199-219, https://doi.org/10.1016/S0025-3227(98)00081-4
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Abstract:
Pyrite formation within and directly below sapropels in the eastern Mediterranean was governed by the relative rates of sulphide production and Fe liberation and supply to the organic-rich layers. At times of relatively high [SO4]2- reduction, sulphide could diffuse downward from the sapropel and formed pyrite in underlying sediments. The sources of Fe for pyrite formation comprised detrital Fe and diagenetically liberated Fe(II) from sapropel-underlying sediments. In organic-rich sapropels, input of Fe from the water column via Fe sulphide formation in the water may have been important as well. Rapid pyrite formation at high saturation levels resulted in the formation of framboidal pyrite within the sapropels, whereas below the sapropels slow euhedral pyrite formation at low saturation levels occurred. d34S values of pyrite are -33 per mil to -50 per mil. Below the sapropels d34S is lower than within the sapropels, as a result of increased sulphide re-oxidation at times of relatively high sulphide production and concentration when sulphide could escape from the sediment. The percentage of initially formed sulphide that was re-oxidized was estimated from organic carbon fluxes and burial efficiencies in the sediment. It ranges from 34% to 80%, varying significantly between sapropels. Increased palaeoproductivity as well as enhanced preservation contributed to magnified accumulation of organic matter in sapropels.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 33.871380 * Median Longitude: 28.653521 * South-bound Latitude: 33.393300 * West-bound Longitude: 24.883100 * North-bound Latitude: 34.071100 * East-bound Longitude: 32.725600
Date/Time Start: 1995-04-03T00:40:00 * Date/Time End: 1995-04-16T17:55:00
Event(s):
160-967C * Latitude: 34.071100 * Longitude: 32.725600 * Date/Time Start: 1995-04-03T00:40:00 * Date/Time End: 1995-04-03T11:50:00 * Elevation: -2553.0 m * Penetration: 114.4 m * Recovery: 119.55 m * Location: Eastern Basin * Campaign: Leg160 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 114.4 m cored; 0 m drilled; 104.5 % 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 * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 97.9 m cored; 0 m drilled; 102.4 % recovery
UM26_BC * Latitude: 33.393300 * Longitude: 25.015000 * Elevation: -2160.0 m * Location: Eastern Mediterranean Sea * Method/Device: Box corer (BC) * Comment: 1994 Palaeoflux cruise RV Urania
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
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Datasets listed in this publication series
- Passier, HF; Middelburg, JJ; de Lange, GJ et al. (1999): (Table 2) Calculated organic carbon burial efficiencies and sulphide re-oxidation percentages from ODP Holes 160-967C and 160-969E. https://doi.org/10.1594/PANGAEA.758838
- Passier, HF; Middelburg, JJ; de Lange, GJ et al. (1999): (Table 3) Export productivities from ODP Hole 160-967C and 160-969E. https://doi.org/10.1594/PANGAEA.758839
- Passier, HF; Middelburg, JJ; de Lange, GJ et al. (1999): (Table 1) Pyrite microtextures and stable isotope values of pyrite from ODP Holes 160-967C and 160-969E. https://doi.org/10.1594/PANGAEA.758837