High-magnitude stresses induced by mineral-hydration reactions
Détails
Télécharger: g50493.1-2.pdf (2124.18 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_F8A25AC18BA8
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
High-magnitude stresses induced by mineral-hydration reactions
Périodique
Geology
ISSN
0091-7613
1943-2682
1943-2682
Statut éditorial
Publié
Date de publication
01/12/2022
Peer-reviewed
Oui
Volume
50
Numéro
12
Pages
1351-1355
Langue
anglais
Résumé
Fluid-rock interactions play a critical role in Earth’s lithosphere and environmental subsurface systems. In the absence of chemical mass transport, mineral-hydration reactions would be accompanied by a solid-volume increase that may induce differential stresses and associated reaction-induced deformation processes, such as dilatant fracturing to increase fluid permeability. However, the magnitudes of stresses that manifest in natural systems remain poorly constrained. We used optical and electron microscopy to show that one of the simplest hydration reactions in nature [MgO + H2O = Mg(OH)2] can induce stresses of several hundred megapascals, with local stresses of as much as ∼1.5 GPa. We demonstrate that these stresses not only cause fracturing but also induce plastic deformation with dislocation densities (1015 m−2) exceeding those typical of tectonically deformed rocks. If these reaction-induced stresses can be transmitted across larger length scales, they may influence the bulk stress state of reacting regions. Moreover, the structural damage induced may be the first step toward catastrophic rock failure, triggering crustal seismicity.
Mots-clé
Geology
Web of science
Open Access
Oui
Création de la notice
05/05/2023 9:54
Dernière modification de la notice
06/05/2023 7:16