气候变化领域集成服务门户(CCPortal): Time-resolved grain-scale 3D imaging of hydrofracturing in halite layers induced by gypsum dehydration and pore fluid pressure buildup

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DOI	10.1016/j.epsl.2020.116679
	Time-resolved grain-scale 3D imaging of hydrofracturing in halite layers induced by gypsum dehydration and pore fluid pressure buildup
	Marti S.; Fusseis F.; Butler I.B.; Schlepütz C.; Marone F.; Gilgannon J.; Kilian R.; Yang Y.
发表日期	2021
ISSN	0012821X
卷号	554
英文摘要	Fluid release from dehydration reactions is considered to have significant effects on the strength and dynamics of tectonic faults at convergent plate boundaries. It is classically assumed that the production of fluid leads to increased pore fluid pressures that perturb a fault's stress state and thereby facilitates and enhances deformation. This important assumption has never been supported by direct microstructural observations. Here, we investigate the role of gypsum dehydration in the deformation of evaporitic rocks using synchrotron-based time-resolved X-ray computed microtomography (4D) imaging. This approach enables the documentation of coupled chemical, hydraulic and mechanical processes on the grain scale. In our experiments with deforming halite-gypsum-halite sandwiches we observe that the fluid released by dehydrating gypsum accumulates at the gypsum-halite interface before a distributed hydraulic failure of the halite layer drains the fluid. From our observations we conclude that perceivedly impermeable halite layers in evaporites are unlikely to trap overpressured fluid, e.g., in thin-skinned tectonic detachment horizons. Moreover, as the hydraulic failure is diffuse and not localized, our experiments suggest that dehydration reactions alone may not explain intermediate depth seismicity in subduction zones. Our data demonstrate the significant potential that in-situ 4D imaging has for the grain-scale investigation of fundamental tectonic processes. © 2020 Elsevier B.V.
关键词	4D micro tomography dehydration reaction causing hydraulic fracturing evaporite deformation gypsum dehydration
英文关键词	Deformation; Dehydration; Faulting; Gypsum; Reaction intermediates; Sodium chloride; Convergent plate boundaries; Dehydration reactions; Intermediate depths; Mechanical process; Micro-structural observations; Pore fluid pressure; Thin-skinned tectonics; X-ray computed microtomography; Chloride minerals; crystal chemistry; deformation; dehydration; evaporite; fluid pressure; gypsum; halite; hydraulic fracturing; imaging method; induced response; porewater; X-ray tomography
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203212
作者单位	School of Geosciences, The University of Edinburgh, Edinburgh, United Kingdom; Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland; Institute of Geological Sciences, University of Bern, Bern, Switzerland; Institute of Geoscience, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
推荐引用方式 GB/T 7714	Marti S.,Fusseis F.,Butler I.B.,et al. Time-resolved grain-scale 3D imaging of hydrofracturing in halite layers induced by gypsum dehydration and pore fluid pressure buildup[J],2021,554.
APA	Marti S..,Fusseis F..,Butler I.B..,Schlepütz C..,Marone F..,...&Yang Y..(2021).Time-resolved grain-scale 3D imaging of hydrofracturing in halite layers induced by gypsum dehydration and pore fluid pressure buildup.Earth and Planetary Science Letters,554.
MLA	Marti S.,et al."Time-resolved grain-scale 3D imaging of hydrofracturing in halite layers induced by gypsum dehydration and pore fluid pressure buildup".Earth and Planetary Science Letters 554(2021).