Methoxyl stable isotopic constraints on the origins and limits of coal-bed methane
Microbial coal-bed methane is an important economic resource and source of a potent greenhouse gas, but controls on its formation are poorly understood. To test whether the microbial degradability of coal limits microbial methane, we monitored methoxyl group demethylation-a reaction that feeds methanogenesis-in a global sample suite ranging in maturity from wood to bituminous coal. Carbon isotopic compositions of residual methoxyl groups were inconsistent with a thermal reaction, instead implying a substrate-limited biologic process. This suggests that deep biosphere communities participated in transforming plant matter to coal on geologic time scales and that methoxyl abundance influences coal-bed methane yield. Carbon isotopic enrichments resulting from microbial methylotrophy also explain an enigmatic offset in the carbon-13 content of microbial methane from coals and conventional hydrocarbon deposits.
|Work Title||Methoxyl stable isotopic constraints on the origins and limits of coal-bed methane|
|License||In Copyright (Rights Reserved)|
|Publication Date||November 12, 2021|
|Publisher Identifier (DOI)||
|Deposited||July 22, 2022|
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