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| DOI | 10.1016/j.tecto.2019.228288 |
| Effect of grain size and grain size distribution on slip dynamics: An experimental analysis | |
| Randolph-Flagg J.; Reber J.E. | |
| 发表日期 | 2020 |
| ISSN | 00401951 |
| 卷号 | 774 |
| 英文摘要 | When faults form and slip they produce granular wear material that accommodates most of the strain. We investigate the effect of grain size and grain size distribution on slip dynamics by using sheared elliptical acrylic discs as a fault gouge proxy. Physical experiments on three different grain size assemblages are performed in a spring slider apparatus. Our results indicate that below a grain diameter threshold of 1/10 of the shear zone width, increasing grain size corresponds to faster slip velocities during slip events. In experiments with more than one grain size, the relative proportions of grain sizes and effective grain sizes control the bulk behavior. We show that shear zones with grains that are larger than 1/10 of the shear zone width show deformation dynamics that are independent of the small grain fraction. In shear zones where the grain sizes are below this threshold a high abundance of small grains promotes slower and smaller slip events. © 2019 Elsevier B.V. |
| 关键词 | Analog modelingGougeGrain-size-distributionGranular mechanicsRheology and friction of fault zonesSlip dynamics |
| 英文关键词 | Dynamics; Shear flow; Size distribution; Analog modeling; Gouge; Grain size distribution; Granular mechanics; Rheology and friction of fault zones; Slip dynamics; Grain size and shape; analog model; experimental study; fault zone; friction; grain size; granular medium; rheology; size distribution; slip |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207857 |
| 作者单位 | Department of Geological and Atmospheric Sciences, Iowa State UniversityIA 50011, United States |
| 推荐引用方式 GB/T 7714 | Randolph-Flagg J.,Reber J.E.. Effect of grain size and grain size distribution on slip dynamics: An experimental analysis[J],2020,774. |
| APA | Randolph-Flagg J.,&Reber J.E..(2020).Effect of grain size and grain size distribution on slip dynamics: An experimental analysis.Tectonophysics,774. |
| MLA | Randolph-Flagg J.,et al."Effect of grain size and grain size distribution on slip dynamics: An experimental analysis".Tectonophysics 774(2020). |
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