Sulphur diagenesis in the sediments of the Kiel Bight, SW Baltic Sea, as reflected by multiple stable sulphur isotopes.
In this work, the biogeochemistry of marine sediments from the Kiel Bight, coastal SW Baltic Sea, is studied based on the abundance and isotopic composition of organic carbon and different forms of sedimentary sulphur. Active bacterial sulphate reduction, partly under sulphate-limiting conditions, is evident from paired δ(34)S and δ(18)O values of pore water sulphate. The resulting pore water sulphide is partly precipitated as acid-volatile iron sulphide and subsequently forms sedimentary pyrite, partly serves in later diagenetic sulphurisation of organic matter, or remains dissolved in the pore water, all evident from the respective δ(34)S values. Microbial sulphate turnover is associated with an apparent isotopic fractionation between dissolved sulphate and dissolved sulphide (Δ(34)S) that varies between 46 and 66‰.
Institut für Geologie und Paläontologie, Westfälische Wilhelms-Universität Münster, 48149, Münster, Germany. hstrauss@uni-muenster.de
Harald
H
Strauss
Rebecca
R
Bast
Anja
A
Cording
David
D
Diekrup
Artur
A
Fugmann
Dieter
D
Garbe-Schönberg
Andreas
A
Lutter
Martin
M
Oeser
Katharina
K
Rabe
Debora
D
Reinke
Barbara M A
BM
Teichert
Ulrike
U
Westernströer
D019015:Geologic Sediments / Q000032:analysis / Q000382:microbiology*; D005858:Germany; D012623:Seawater / Q000737:chemistry / Q000382:microbiology*; D013431:Sulfates / Q000378:metabolism*; D013455:Sulfur / Q000378:metabolism*; D013460:Sulfur Isotopes / Q000032:analysis / Q000378:metabolism
D013431:Sulfates; D013460:Sulfur Isotopes; D013455:Sulfur