热化学硫酸盐还原过程中磁同位素效应的证据。
Evidence of magnetic isotope effects during thermochemical sulfate reduction.
机构信息
Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA.
出版信息
Proc Natl Acad Sci U S A. 2011 Oct 25;108(43):17635-8. doi: 10.1073/pnas.1108112108. Epub 2011 Oct 12.
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.
摘要
简单氨基酸和低浓度硫酸盐的热化学硫酸盐还原实验揭示了显著程度的质量无关硫同位素分馏。高达 13‰的 (33)S 富集归因于与硫醇-二硫化物、离子自由基对形成相关的磁同位素效应（MIE）。本文通过经典（质量依赖）同位素效应和混合过程解释了产物中观察到的 (36)S 亏损。实验数据与太古宙样品中多种硫同位素趋势形成强烈对比，太古宙样品表现出显著的 (36)S 异常。这些结果支持对早期地球样品中观察到的质量无关信号的起源不是热化学硫酸盐还原。
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