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Zusammenfassung:
A stable isotope geochemical investigation (S-34/S-32, C-13/C-12, O-18/O-16) has been carried out to study the development of anoxic surface sediments ("black spots") in the backbarrier tidal area of Spiekeroog island (southern North Sea. Microbial sulfate reduction related to the degradation of mainly marine organic matter under anaerobic conditions led to the accumulation of hydrogen bisulfide (up to 8 mM) in the interstitial waters of the sandy sediments. While the carbon isotopic composition of organic matter reflected the downcore preferential degradation of labile (marine) organic matter, sulfur and oxygen isotope variations in the dissolved sulfur species provided information about the microbiologically mediated complex interactions bt tween the sulfur, carbon and oxygen cycles. (C) 1998 Elsevier Science Ltd. All rights reserved.
