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  Carbon isotope equilibration during sulphate-limited anaerobic oxidation of methane

Yoshinaga, M., Holler, T., Goldhammer, T., Wegener, G., Pohlman, J., Brunner, B., et al. (2014). Carbon isotope equilibration during sulphate-limited anaerobic oxidation of methane. Nature Geoscience, 7: 1, pp. 190-194.

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Yoshinaga, M.Y., Author
Holler, T.1, Author           
Goldhammer, T., Author
Wegener, G.2, Author           
Pohlman, J.W., Author
Brunner, B.3, Author           
Kuypers, M.M.M.3, Author           
Hinrichs, K.U., Author
Elvert, M.3, Author           
Affiliations:
1Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481695              
2HGF MPG Joint Research Group for Deep Sea Ecology & Technology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481702              
3Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              

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 Abstract: Collectively, marine sediments comprise the largest reservoir of methane on Earth. The flux of methane from the sea bed to the overlying water column is mitigated by the sulphate-dependent anaerobic oxidation of methane by marine microbes within a discrete sedimentary horizon termed the sulphate–methane transition zone. According to conventional isotope systematics, the biological consumption of methane leaves a residue of methane enriched in 13C (refs 1, 2, 3). However, in many instances the methane within sulphate–methane transition zones is depleted in 13C, consistent with the production of methane, and interpreted as evidence for the intertwined anaerobic oxidation and production of methane4, 5, 6. Here, we report results from experiments in which we incubated cultures of microbial methane consumers with methane and low levels of sulphate, and monitored the stable isotope composition of the methane and dissolved inorganic carbon pools over time. Residual methane became progressively enriched in 13C at sulphate concentrations above 0.5 mM, and progressively depleted in 13C below this threshold. We attribute the shift to 13C depletion during the anaerobic oxidation of methane at low sulphate concentrations to the microbially mediated carbon isotope equilibration between methane and carbon dioxide. We suggest that this isotopic effect could help to explain the 13C-depletion of methane in subseafloor sulphate–methane transition zones.

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Language(s): eng - English
 Dates: 2014-01-26
 Publication Status: Issued
 Pages: 6
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 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 701052
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Title: Nature Geoscience
  Abbreviation : Nat. Geosci.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 7 Sequence Number: 1 Start / End Page: 190 - 194 Identifier: ISSN: 1752-0894
CoNE: https://pure.mpg.de/cone/journals/resource/1752-0894