Large sulfur isotope fractionation by bacterial sulfide oxidation

André Pellerin, Gilad Antler, Simon Agner Holm, Alyssa J. Findlay, Peter W. Crockford, Alexandra V. Turchyn, Bo Barker Jørgensen, Kai Finster

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

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
Volume5
Issue number7
DOIs
StatePublished - 24 Jul 2019

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