气候变化领域集成服务门户(CCPortal): Low Friction Coefficient of Phyllosilicate Fault Gouges and the Effect of Humidity: Insights From a New Microphysical Model

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DOI	10.1029/2019JB018683
	Low Friction Coefficient of Phyllosilicate Fault Gouges and the Effect of Humidity: Insights From a New Microphysical Model
	den Hartog S.A.M.; Faulkner D.R.; Spiers C.J.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	Fault slip is often localized in phyllosilicate-rich fault gouges in a manner consistent with the relatively low friction coefficients measured for dry and especially wet phyllosilicates in laboratory experiments. However, the microphysics controlling these low friction coefficients remains unclear. Here, we propose a microphysical model, inspired by microstructural observations, for the prediction of the absolute value of the friction coefficient of pure dry and wet phyllosilicates. Experimentally produced phyllosilicate gouges suggest that shearing is controlled by sliding along (001) grain/platelet interfaces operating in series with removal of overlapping grain edge barriers by basal cleavage. We derive a model incorporating a subcritical crack propagation equation for the latter, constrained by subcritical crack growth data for muscovite. Model predictions for muscovite show similar trends regarding the effects of humidity and slip velocity on friction coefficient as do experiments at room temperature. The absolute value predicted for the friction coefficient is difficult to compare with experimental values, as it critically depends on atomic scale (001) sliding resistance, which is poorly constrained by available experimental data. Further discrepancies with experimental data can be explained by effects of varying grain size, grain aspect ratio, and porosity on the friction coefficient. While numerous qualitative explanations have been proposed previously for the low friction coefficient exhibited by phyllosilicates, especially in the presence of water, our study provides a new step toward a quantitative, physically based model. ©2020. The Authors.
英文关键词	faults; mica; microphysical processes; quantitative; shear
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187816
作者单位	Rock Deformation Laboratory, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom; Now at The Lyell Centre, Heriot-Watt University, Edinburgh, United Kingdom; HPT Laboratory, Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	den Hartog S.A.M.,Faulkner D.R.,Spiers C.J.. Low Friction Coefficient of Phyllosilicate Fault Gouges and the Effect of Humidity: Insights From a New Microphysical Model[J],2020,125(6).
APA	den Hartog S.A.M.,Faulkner D.R.,&Spiers C.J..(2020).Low Friction Coefficient of Phyllosilicate Fault Gouges and the Effect of Humidity: Insights From a New Microphysical Model.Journal of Geophysical Research: Solid Earth,125(6).
MLA	den Hartog S.A.M.,et al."Low Friction Coefficient of Phyllosilicate Fault Gouges and the Effect of Humidity: Insights From a New Microphysical Model".Journal of Geophysical Research: Solid Earth 125.6(2020).