How clay delamination supports aseismic slip
文献类型：期刊论文
| 作者 | Zhou, Huijun1,2,3; Chen, Meng2,3 ; Zhu, Runliang1,2,3; Zhu, Jianxi1,2,3; He, Hongping1,2,3
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| 刊名 | AMERICAN MINERALOGIST
 |
| 出版日期 | 2023 |
| 卷号 | 108期号:1页码:87-99 |
| 关键词 | SAN-ANDREAS FAULT MOLECULAR-DYNAMICS NA-MONTMORILLONITE WEAK FAULTS STICK-SLIP FRICTION WATER SIMULATIONS EARTHQUAKES STABILITY |
| ISSN号 | 0003-004X |
| DOI | 10.2138/am-2022-8195 |
| 英文摘要 | Aseismic slip is a stable fault slip, which allows strain to be relieved smoothly. Aseismic slip prevents the earthquake propagation, but it could nucleate an earthquake elsewhere. Understanding the mechanism of aseismic slip is promising in revealing the seismic cycle. Experimental evidence showed clay-rich fault gouge bears a low-friction strength, and the friction is strengthened with slip velocity (velocity-strengthening), which was thought to support aseismic slip. Clay minerals are comprised of platy crystalline layers with water intercalated between them, which may act as a lubricant. Sliding between clay layers was suspected to support aseismic slip but lacked a clarified mechanistic insight. We use non-equilibrium molecular dynamics simulations to show that shear-induced interlayer sliding is frictionally weak and velocity-strengthening, which evidences the role of clay minerals in aseismic slip. We find that interlayer water is a viscous fluid at most times, which explains the shear response of interlayer sliding. Depending on temperature and pressure conditions, intercalated water can be monolayer or bilayer, fluidic or ice like. Shear induces ice-like water to transform into fluidic water, which happens as a stick-slip phenomenon reflecting a first-order transition. Increased pore fluid pressure leads to the transformation from monolayer to bilayer intercalated water, resulting in a lower friction strength and enhanced velocity-strengthening behavior. Our work suggests that disclosing the hydration state of a clay mineral is preliminary when studying fault mechanics. ? 2023 De Gruyter. All rights reserved. |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000923813700007 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80195]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing; 100049, China 2.CAS Center for Excellence in Deep Earth Science, Guangzhou; 510640, China 3.CAS Key Laboratory of Mineralogy and Metallogeny, Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Institutions of Earth Science, Chinese Academy of Sciences (CAS), Guangzhou; 510640, China |
| 推荐引用方式 GB/T 7714 | Zhou, Huijun,Chen, Meng,Zhu, Runliang,et al. How clay delamination supports aseismic slip[J]. AMERICAN MINERALOGIST,2023,108(1):87-99. |
| APA | Zhou, Huijun,Chen, Meng,Zhu, Runliang,Zhu, Jianxi,&He, Hongping.(2023).How clay delamination supports aseismic slip.AMERICAN MINERALOGIST,108(1),87-99. |
| MLA | Zhou, Huijun,et al."How clay delamination supports aseismic slip".AMERICAN MINERALOGIST 108.1(2023):87-99. |
入库方式： OAI收割
来源：广州地球化学研究所
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