Evidence of magnetic isotope effects during thermochemical sulfate reduction
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 f...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | en_US |
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National Academy of Sciences
2012
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| Online Access: | http://hdl.handle.net/1721.1/72514 |
| _version_ | 1811087115592663040 |
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| author | Oduro, Harry D. Cody, George D. Farquhar, James Harms, Brian Kaufman, Alan J. Sintim, Herman O. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Oduro, Harry D. Cody, George D. Farquhar, James Harms, Brian Kaufman, Alan J. Sintim, Herman O. |
| author_sort | Oduro, Harry D. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T13:40:22Z |
| format | Article |
| id | mit-1721.1/72514 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:40:22Z |
| publishDate | 2012 |
| publisher | National Academy of Sciences |
| record_format | dspace |
| spelling | mit-1721.1/725142022-09-28T15:24:14Z Evidence of magnetic isotope effects during thermochemical sulfate reduction Oduro, Harry D. Cody, George D. Farquhar, James Harms, Brian Kaufman, Alan J. Sintim, Herman O. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Oduro, Harry D. Oduro, Harry D. 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. 2012-09-05T13:02:24Z 2012-09-05T13:02:24Z 2011-10 2011-08 Article http://purl.org/eprint/type/JournalArticle 0027-8424 1091-6490 http://hdl.handle.net/1721.1/72514 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. 21997216 en_US http://dx.doi.org/10.1073/pnas.1108112108 Proceedings of the National Academy of Sciences 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. application/pdf National Academy of Sciences PNAS |
| spellingShingle | Oduro, Harry D. Cody, George D. Farquhar, James Harms, Brian Kaufman, Alan J. Sintim, Herman O. Evidence of magnetic isotope effects during thermochemical sulfate reduction |
| title | Evidence of magnetic isotope effects during thermochemical sulfate reduction |
| title_full | Evidence of magnetic isotope effects during thermochemical sulfate reduction |
| title_fullStr | Evidence of magnetic isotope effects during thermochemical sulfate reduction |
| title_full_unstemmed | Evidence of magnetic isotope effects during thermochemical sulfate reduction |
| title_short | Evidence of magnetic isotope effects during thermochemical sulfate reduction |
| title_sort | evidence of magnetic isotope effects during thermochemical sulfate reduction |
| url | http://hdl.handle.net/1721.1/72514 |
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