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Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere
Hydration and carbonation reactions within the Earth cause an increase in solid volume by up to several tens of vol%, which can induce stress and rock fracture. Observations of naturally hydrated and carbonated peridotite suggest that permeability and fluid flow are enhanced by reaction-induced frac...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8784132/ https://www.ncbi.nlm.nih.gov/pubmed/35031568 http://dx.doi.org/10.1073/pnas.2110776118 |
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author | Uno, Masaoki Koyanagawa, Kodai Kasahara, Hisamu Okamoto, Atsushi Tsuchiya, Noriyoshi |
author_facet | Uno, Masaoki Koyanagawa, Kodai Kasahara, Hisamu Okamoto, Atsushi Tsuchiya, Noriyoshi |
author_sort | Uno, Masaoki |
collection | PubMed |
description | Hydration and carbonation reactions within the Earth cause an increase in solid volume by up to several tens of vol%, which can induce stress and rock fracture. Observations of naturally hydrated and carbonated peridotite suggest that permeability and fluid flow are enhanced by reaction-induced fracturing. However, permeability enhancement during solid-volume–increasing reactions has not been achieved in the laboratory, and the mechanisms of reaction-accelerated fluid flow remain largely unknown. Here, we present experimental evidence of significant permeability enhancement by volume-increasing reactions under confining pressure. The hydromechanical behavior of hydration of sintered periclase [MgO + H(2)O → Mg(OH)(2)] depends mainly on the initial pore-fluid connectivity. Permeability increased by three orders of magnitude for low-connectivity samples, whereas it decreased by two orders of magnitude for high-connectivity samples. Permeability enhancement was caused by hierarchical fracturing of the reacting materials, whereas a decrease was associated with homogeneous pore clogging by the reaction products. These behaviors suggest that the fluid flow rate, relative to reaction rate, is the main control on hydromechanical evolution during volume-increasing reactions. We suggest that an extremely high reaction rate and low pore-fluid connectivity lead to local stress perturbations and are essential for reaction-induced fracturing and accelerated fluid flow during hydration/carbonation. |
format | Online Article Text |
id | pubmed-8784132 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-87841322022-07-14 Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere Uno, Masaoki Koyanagawa, Kodai Kasahara, Hisamu Okamoto, Atsushi Tsuchiya, Noriyoshi Proc Natl Acad Sci U S A Physical Sciences Hydration and carbonation reactions within the Earth cause an increase in solid volume by up to several tens of vol%, which can induce stress and rock fracture. Observations of naturally hydrated and carbonated peridotite suggest that permeability and fluid flow are enhanced by reaction-induced fracturing. However, permeability enhancement during solid-volume–increasing reactions has not been achieved in the laboratory, and the mechanisms of reaction-accelerated fluid flow remain largely unknown. Here, we present experimental evidence of significant permeability enhancement by volume-increasing reactions under confining pressure. The hydromechanical behavior of hydration of sintered periclase [MgO + H(2)O → Mg(OH)(2)] depends mainly on the initial pore-fluid connectivity. Permeability increased by three orders of magnitude for low-connectivity samples, whereas it decreased by two orders of magnitude for high-connectivity samples. Permeability enhancement was caused by hierarchical fracturing of the reacting materials, whereas a decrease was associated with homogeneous pore clogging by the reaction products. These behaviors suggest that the fluid flow rate, relative to reaction rate, is the main control on hydromechanical evolution during volume-increasing reactions. We suggest that an extremely high reaction rate and low pore-fluid connectivity lead to local stress perturbations and are essential for reaction-induced fracturing and accelerated fluid flow during hydration/carbonation. National Academy of Sciences 2022-01-14 2022-01-18 /pmc/articles/PMC8784132/ /pubmed/35031568 http://dx.doi.org/10.1073/pnas.2110776118 Text en Copyright © 2022 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Physical Sciences Uno, Masaoki Koyanagawa, Kodai Kasahara, Hisamu Okamoto, Atsushi Tsuchiya, Noriyoshi Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
title | Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
title_full | Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
title_fullStr | Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
title_full_unstemmed | Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
title_short | Volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
title_sort | volatile-consuming reactions fracture rocks and self-accelerate fluid flow in the lithosphere |
topic | Physical Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8784132/ https://www.ncbi.nlm.nih.gov/pubmed/35031568 http://dx.doi.org/10.1073/pnas.2110776118 |
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