Evidence of magnetic isotope effects during thermochemical sulfate reduction
Name
Oduro-2011-Evidence of magnetic.pdf
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Author(s)
Oduro, Harry D.
Cody, George D.
Farquhar, James
Harms, Brian
Kaufman, Alan J.
Sintim, Herman O.
Date Issued
October 2011
Journal
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Citation
Oduro, H. et al. “Evidence of Magnetic Isotope Effects During Thermochemical Sulfate Reduction.” Proceedings of the National Academy of Sciences 108.43 (2011): 17635–17638.
Version
Final published version
Abstract
Thermochemical sulfate reduction experiments with simple amino acid and dilute concentrations of sulfate reveal significant degrees of mass-independent sulfur isotope fractionation. Enrichments of up to 13‰ for [superscript 33]S are attributed to a magnetic isotope effect (MIE) associated with the formation of thiol-disulfide, ion-radical pairs. Observed [superscript 36]S depletions in products are explained here by classical (mass-dependent) isotope effects and mixing processes. The experimental data contrasts strongly with multiple sulfur isotope trends in Archean samples, which exhibit significant [superscript 36]S anomalies. These results support an origin other than thermochemical sulfate reduction for the mass-independent signals observed for early Earth samples.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1073/pnas.1108112108
