Evidence of magnetic isotope effects during thermochemical sulfate reduction
- 12 October 2011
- journal article
- Published by National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 108 (43) , 17635-17638
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 33 S are attributed to a magnetic isotope effect (MIE) associated with the formation of thiol-disulfide, ion-radical pairs. Observed 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 36 S anomalies. These results support an origin other than thermochemical sulfate reduction for the mass-independent signals observed for early Earth samples.Keywords
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