Serpentinization and carbonation of mantle rocks (peridotite alteration) are fundamentally important processes for a spectrum of geoscience topics, including arc volcanism, earthquake processes, chemosynthetic biological communities, and carbon sequestration. Data from a hydrophone array deployed in the Multi‐Borehole Observatory (MBO) of the Oman Drilling Project demonstrates that free gas generated by peridotite alteration and/or microbial activity migrates through the formation in discrete bursts of activity. We detected several, minutes‐long, swarms of gas discharge into Hole BA1B of the MBO over the course of a 9 month observation interval. The episodic nature of the migration events indicates that free gas accumulates in the permeable flow network, is pressurized, and discharges rapidly into the borehole when a critical pressure, likely associated with a capillary barrier at a flow constriction, is reached. Our observations reveal a dynamic mode of fluid migration during serpentinization, and highlight the important role that free gas can play in modulating pore pressure, fluid flow, and alteration kinetics during peridotite weathering.
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Zheng, Xiaojiao ; Cordonnier, Benoît ; Zhu, Wenlu ; Renard, François ; Jamtveit, Bjørn ( , Geochemistry, Geophysics, Geosystems)
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Jamtveit, Bjørn ; Ben-Zion, Yehuda ; Renard, François ; Austrheim, Håkon ( , Nature)
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Incel, Sarah ; Labrousse, Loïc ; Hilairet, Nadège ; John, Timm ; Gasc, Julien ; Shi, Feng ; Wang, Yanbin ; Andersen, Torgeir B. ; Renard, François ; Jamtveit, Bjørn ; et al ( , Geology)