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- W4280491032 abstract "A growing body of work indicates that continental subsurface rocks host a substantial portion of the Earth's biosphere. However, the activities of microbial cells inhabiting pore spaces and microfractures in subsurface rocks remain underexplored. Here, we develop and optimize microcosm assays to detect organic acid transformation activities of cells residing in mafic to ultramafic igneous rocks. Application of this assay to gabbro core from the Stillwater Mine, Montana, USA, revealed maximal methane production from acetate at temperatures approximating that of the mine. Controls show that these activities are not due to contamination introduced during drilling, exhumation, or laboratory processing of the core. The assay was then applied to rocks cored from the Samail Ophiolite, Oman, which is undergoing low-temperature serpentinization. Production of (i) carbon dioxide from acetate and formate and (ii) methane from formate were detected in a dunite/harzburgite rock core interfacing pH 9.6 waters, and estimates of microbial activities were up to three orders of magnitude higher in the rock core pore space than in corresponding waters. The detection of endolithic microbial activities in igneous rocks has implications for life detection on other planetary bodies where similar rock types prevail, such as Mars, Europa and Enceladus." @default.
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- W4280491032 date "2022-05-22" @default.
- W4280491032 modified "2023-10-15" @default.
- W4280491032 title "Transformation of low‐molecular‐weight organic acids by microbial endoliths in subsurface mafic and ultramafic igneous rock" @default.
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- W4280491032 doi "https://doi.org/10.1111/1462-2920.16041" @default.
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