Large sulfur isotope fractionation by bacterial sulfide oxidation

A sulfide-oxidizing microorganism, (DA), generates a consistent enrichment of sulfur-34 ( ) 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 enrichments and suggests that sedimentar...

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Published inScience advances Vol. 5; no. 7; p. eaaw1480
Main Authors Pellerin, André, Antler, Gilad, Holm, Simon Agner, Findlay, Alyssa J, Crockford, Peter W, Turchyn, Alexandra V, Jørgensen, Bo Barker, Finster, Kai
Format Journal Article
LanguageEnglish
Published United States American Association for the Advancement of Science 01.07.2019
Subjects
Chemical Fractionation
Deltaproteobacteria - chemistry
Deltaproteobacteria - metabolism
Geochemistry
Metabolic Networks and Pathways
Oxidation-Reduction
SciAdv r-articles
Sulfates - chemistry
Sulfates - metabolism
Sulfur Isotopes - chemistry
Sulfur Isotopes - metabolism
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Summary:A sulfide-oxidizing microorganism, (DA), generates a consistent enrichment of sulfur-34 ( ) 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 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 in sediments may be the combined result of three microbial metabolisms: microbial sulfate reduction, the disproportionation of external sulfur intermediates, and microbial sulfide oxidation.
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ISSN:2375-2548
2375-2548
DOI:10.1126/sciadv.aaw1480