Abiotic methane synthesis and serpentinization in olivine-hosted fluid inclusions.

ABSTRACT: The conditions of methane (CH₄) formation in olivine-hosted secondary fluid inclusions and their prevalence in peridotite and gabbroic rocks from a wide range of geological settings were assessed using confocal Raman spectroscopy, optical and scanning electron microscopy, electron microprobe analysis, and thermodynamic modeling. Detailed examination of 160 samples from ultraslow- to fast-spreading midocean ridges, subduction zones, and ophiolites revealed that hydrogen (H₂) and CH₄ formation linked to serpentinization within olivine-hosted secondary fluid inclusions is a widespread process. Fluid inclusion contents are dominated by serpentine, brucite, and magnetite, as well as CH_4(g) and H_2(g) in varying proportions, con

SUBMITTER: Klein F 

PROVIDER: S-EPMC6731755 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature