Iron oxides stimulate sulfate-driven anaerobic methane oxidation in seeps

Sivan, Orit; Antler, Gilad; Turchyn, Alexandra V.; Marlow, Jeffrey J.; Orphan, Victoria J.

doi:10.1073/pnas.1412269111

Iron oxides stimulate sulfate-driven anaerobic methane oxidation in seeps

Journal Article · Mon Sep 22 00:00:00 EDT 2014 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1412269111· OSTI ID:1455038

Sivan, Orit ^[1]; Antler, Gilad ^[2]; Turchyn, Alexandra V. ^[2]; Marlow, Jeffrey J. ^[3]; Orphan, Victoria J. ^[3]

Ben Gurion Univ. of the Negev, Beer-Sheva (Israel); Ben Gurion University of the Negev, Israel
Univ. of Cambridge, Cambridge (United Kingdom)
California Inst. of Technology (CalTech), Pasadena, CA (United States)

Seep sediments are dominated by intensive microbial sulfate reduction coupled to the anaerobic oxidation of methane (AOM). Through geochemical measurements of incubation experiments with methane seep sediments collected from Hydrate Ridge, we provide insight into the role of iron oxides in sulfate-driven AOM. Seep sediments incubated with ¹³C-labeled methane showed co-occurring sulfate reduction, AOM, and methanogenesis. The isotope fractionation factors for sulfur and oxygen isotopes in sulfate were about 40‰ and 22‰, respectively, reinforcing the difference between microbial sulfate reduction in methane seeps versus other sedimentary environments (for example, sulfur isotope fractionation above 60‰ in sulfate reduction coupled to organic carbon oxidation or in diffusive sedimentary sulfate–methane transition zone). The addition of hematite to these microcosm experiments resulted in significant microbial iron reduction as well as enhancing sulfate-driven AOM. The magnitude of the isotope fractionation of sulfur and oxygen isotopes in sulfate from these incubations was lowered by about 50%, indicating the involvement of iron oxides during sulfate reduction in methane seeps. The similar relative change between the oxygen versus sulfur isotopes of sulfate in all experiments (with and without hematite addition) suggests that oxidized forms of iron, naturally present in the sediment incubations, were involved in sulfate reduction, with hematite addition increasing the sulfate recycling or the activity of sulfur-cycling microorganisms by about 40%. Furthermore, these results highlight a role for natural iron oxides during bacterial sulfate reduction in methane seeps not only as nutrient but also as stimulator of sulfur recycling.

View Accepted Manuscript (DOE)

Research Organization:: California Inst. of Technology (CalTech), Pasadena, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0004949

OSTI ID:: 1455038

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 40 Vol. 111; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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58 GEOSCIENCES
ANME archaea
anaerobic respiration
deep-sea
methanotrophy
redox

Iron oxides stimulate sulfate-driven anaerobic methane oxidation in seeps

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