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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Do scaly clays control seismicity on faulted shale rocks?
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Do scaly clays control seismicity on faulted shale rocks?

机译：鳞片粘土是否控制出故障页岩岩石的地震性？

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摘要

One of the major challenges regarding the disposal of radioactive waste in geological formations is to ensure isolation of radioactive contamination from the environment and the population. Shales are suitable candidates as geological barriers. However, the presence of tectonic faults within clay formations put the long-term safety of geological repositories into question. In this study, we carry out frictional experiments on intact samples of Opalinus Clay, i.e. the host rock for nuclear waste storage in Switzerland. We report experimental evidence suggesting that scaly clays form at low normal stress (= 20 MPa), at sub-seismic velocities (= 300 mu m/s) and is related to pre-existing bedding planes with an ongoing process where frictional sliding is the controlling deformation mechanism. We have found that scaly clays show a velocity-weakening and -strengthening behaviour, low frictional strength, and poor re-strengthening over time, conditions required to allow the potential nucleation and propagation of earthquakes within the scaly clays portion of the formation. The strong similarities between the microstructures of natural and experimental scaly clays suggest important implications for the slip behaviour of shallow faults in shales. If natural and anthropogenic perturbations modify the stress conditions of the fault zone, earthquakes might have the potential to nucleate within zones of scaly clays controlling the seismicity of the clay-rich tectonic system, thus, potentially compromising the long-term safeness of geological repositories situated in shales. (C) 2018 Elsevier B.V. All rights reserved.
机译：关于地质形成放射性废物处理的主要挑战之一是确保从环境和人口中分离放射性污染。 Shales是作为地质障碍的合适候选人。然而，粘土形成中的构造故障存在对地质存储库的长期安全性。在这项研究中，我们对透明剂粘土的完整样品进行了摩擦实验，即瑞士核废料储存的主体岩石。我们报告了实验证据，提示在低正常应力（＆ = 20mPa）处，在亚地震速度（＆ =300μm/ s）处形成鳞片状粘土，并且与具有持续过程的预先存在的床上用品窗口有关摩擦滑动是控制变形机制。我们发现鳞片状粘土显示速度弱化和高兴的行为，低摩擦力和随着时间的推移，允许地震在地层的鳞片状粘土部分内潜在成核和繁殖所需的条件。天然和实验性鳞片状粘土的微观结构之间的强烈相似性对Shales浅层缺失的滑移行为表示重要意义。如果天然和人为扰动改变断层区的应力条件，地震可能会对控制富含粘土的构造系统的地震性的鳞片状粘土区域内有可能核心，从而潜在地损害了位于地质存储库的长期安全性在Shales。 （c）2018年elestvier b.v.保留所有权利。

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