globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116679
论文题名:
Time-resolved grain-scale 3D imaging of hydrofracturing in halite layers induced by gypsum dehydration and pore fluid pressure buildup
作者: Marti S.; Fusseis F.; Butler I.B.; Schlepütz C.; Marone F.; Gilgannon J.; Kilian R.; Yang Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 554
语种: 英语
中文关键词: 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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165590
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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

Recommended Citation:
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]. Earth and Planetary Science Letters,2021-01-01,554
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