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Alyssa Jean Lehsau Findlay

Large sulfur isotope fractionation by bacterial sulfide oxidation

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  • André Pellerin
  • Gilad Antler, Ben-Gurion University of the Negev, Interuniversity Institute for Marine Sciences of Eilat
  • ,
  • Simon Agner Holm, Center for Geomicrobiology, Department of Bioscience, Aarhus University, Ny Munkegade 114, 8000 Aarhus C, Denmark.
  • ,
  • Alyssa J. Findlay
  • Peter W. Crockford, Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel., Princeton University, Princeton, NJ
  • ,
  • Alexandra V. Turchyn, Cambridge University
  • ,
  • Bo Barker Jørgensen
  • Kai Finster

A sulfide-oxidizing microorganism, Desulfurivibrio alkaliphilus (DA), generates a consistent enrichment of sulfur-34 (34S) in the produced sulfate of +12.5 per mil or greater. This observation challenges the general consensus that the microbial oxidation of sulfide does not result in large 34S enrichments and suggests that sedimentary sulfides and sulfates may be influenced by metabolic activity associated with sulfide oxidation. Since the DA-type sulfide oxidation pathway is ubiquitous in sediments, in the modern environment, and throughout Earth history, the enrichments and depletions in 34S in sediments may be the combined result of three microbial metabolisms: microbial sulfate reduction, the disproportionation of external sulfur intermediates, and microbial sulfide oxidation.

Original languageEnglish
Article numbereaaw1480
JournalScience Advances
Publication statusPublished - Jul 2019

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