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Harada, Hironobu; Tsujimori, Tatsuki
Progress in earth and planetary science, 12/2024, Letnik: 11, Številka: 1Journal Article
Abiotic synthesis of hydrocarbon-bearing fluids during geological processes has a significant impact on the evolution of both the Earth's biosphere and the solid Earth. Aqueous alteration of ultramafic rocks, i.e., serpentinization, which forms serpentinite, is one of the geological processes generating abiotic methane (CH 4 ). However, abiotic CH 4 generation is not limited to the serpentinization of mafic and ultramafic lithologies. Metasedimentary dolomitic marble from the Hida Belt, Japan, is characterized by the presence of forsterite-rich olivine (Fo ~89–93 ), and olivine crystals contain abundant fluid inclusions (<1 to 10 μm in size). Raman spectroscopic analyses of olivine-hosted fluid inclusions found that both primary and secondary fluid inclusions contain CH 4 , lizardite/chrysotile, and brucite. This indicates that micro-scale interactions between COH fluid and host olivine produced CH 4 through the reduction of CO 2 by H 2 released during local serpentinization within inclusions. Our observation implies that the dolomitic marble has the potential to be a key lithology for the synthesis and storage of abiotic CH 4 in a shallower crustal portion of orogenic belts.
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