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Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman

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...

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Autores principales: Aiken, John M., Sohn, Robert A., Renard, François, Matter, Juerg, Kelemen, Peter, Jamtveit, Bjørn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787822/
https://www.ncbi.nlm.nih.gov/pubmed/36589777
http://dx.doi.org/10.1029/2022GL100395
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author Aiken, John M.
Sohn, Robert A.
Renard, François
Matter, Juerg
Kelemen, Peter
Jamtveit, Bjørn
author_facet Aiken, John M.
Sohn, Robert A.
Renard, François
Matter, Juerg
Kelemen, Peter
Jamtveit, Bjørn
author_sort Aiken, John M.
collection PubMed
description 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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spelling pubmed-97878222022-12-28 Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman Aiken, John M. Sohn, Robert A. Renard, François Matter, Juerg Kelemen, Peter Jamtveit, Bjørn Geophys Res Lett Research Letter 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. John Wiley and Sons Inc. 2022-10-31 2022-11-16 /pmc/articles/PMC9787822/ /pubmed/36589777 http://dx.doi.org/10.1029/2022GL100395 Text en © 2022. The Authors. https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Letter
Aiken, John M.
Sohn, Robert A.
Renard, François
Matter, Juerg
Kelemen, Peter
Jamtveit, Bjørn
Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman
title Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman
title_full Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman
title_fullStr Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman
title_full_unstemmed Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman
title_short Gas Migration Episodes Observed During Peridotite Alteration in the Samail Ophiolite, Oman
title_sort gas migration episodes observed during peridotite alteration in the samail ophiolite, oman
topic Research Letter
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9787822/
https://www.ncbi.nlm.nih.gov/pubmed/36589777
http://dx.doi.org/10.1029/2022GL100395
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