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Sulphur Enrichment in Organic Matter of Eastern Mediterranean Sapropels: A Study of Sulphur Isotope Partitioning

Aquatic Geochemistry volume 5, pages 99–118 (1999)Cite this article

Abstract

Sulphur isotope compositions and S/C ratios of organic matter were analysed in detail by combustion-isotope ratio monitoring mass spectrometry (C-irmMS) in eastern Mediterranean sediments containing three sapropels of different ages and with different organic carbon contents (sapropel S1 in core UM26, formed from 5–9 ka ago with a maximum organic carbon content of 2.3 wt%; sapropel 967 from ODP Site 160-967C, with an age of 1.8 Ma and a maximum organic carbon content of 7.4 wt%; and sapropel 969 from ODP Site 160-969E, with an age of 2.9 Ma and a maximum organic carbon content of 23.5 wt%). Sulphur isotopic compositions (δ34S) of the organic matter ranged from -29.5 to +15.8‰ and the atomic S/C ratio was 0.005 to 0.038. The organic sulphur in the sediments is a mixture of sulphur derived from (1) incorporation of 34S-depleted inorganic reduced sulphur produced by dissimilatory microbial sulphate reduction; and (2) biosynthetic sulphur with an isotopic signature close to seawater sulphate. The calculated biosynthetic fraction of organic sulphur in non-sapropelic sediments ranges from 68–87%. The biosynthetic fraction of the organic sulphur of the sapropels (60–22%) decreases with increasing organic carbon content of the sapropels. We propose that uptake of reduced sulphur into organic matter predominantly took place within sapropels where pyrite formation was iron-limited and thus an excess of dissolved sulphide was present for certain periods of time. Simultaneously, sulphide escaped into the bottom water and into sediments below the sapropels where pyrite formation occurred.

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Author notes

  1. Hilde F. Passier

    Present address: Paleomagnetic Laboratory ''Fort Hoofddijk'', Budapestlaan 17, NL-3584 CD, Utrecht, The Netherlands

  2. Michael E. Böttcher

    Present address: Department of Biogeochemistry, Max-Planck-Institute for Marine Microbiology, Celsiusstrasse 1, D- 28359, Bremen, Germany

Authors and Affiliations

  1. Institute of Paleo-environments and Paleoclimate Utrecht (IPPU), Department of Geochemistry, Utrecht University, P.O. Box 80021, NL- 3508 TA, Utrecht, The Netherlands

    Hilde F. Passier & Gert J. De Lange

  2. Institute for Chemistry and Biology of the Marine Environment (ICBM), Carl von Ossietzky University, P.O. Box 2503, D-26111, Oldenburg, Germany

    Michael E. Böttcher

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  3. Gert J. De Lange
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Passier, H.F., Böttcher, M.E. & Lange, G.J.D. Sulphur Enrichment in Organic Matter of Eastern Mediterranean Sapropels: A Study of Sulphur Isotope Partitioning. Aquatic Geochemistry 5, 99–118 (1999). https://doi.org/10.1023/A:1009676107330

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  • Issue Date:

  • DOI: https://doi.org/10.1023/A:1009676107330

  • Eastern Mediterranean
  • sapropel
  • organic sulphur
  • sulphur isotopes
  • C-irmMS
  • pyrite