Climate Change Data Portal
| DOI | 10.1016/j.tecto.2020.228377 |
| Frictional properties of actinolite-chlorite gouge at hydrothermal conditions | |
| Okamoto A.S.; Niemeijer A.R.; Takeshita T.; Verberne B.A.; Spiers C.J. | |
| 发表日期 | 2020 |
| ISSN | 00401951 |
| 卷号 | 779 |
| 英文摘要 | Exhumed subduction zones frequently show widespread actinolite-chlorite (Act-Chl) dominated compositions, suggesting that this may play an important role in controlling megathrust fault slip. We investigate the frictional behavior of simulated Act-Chl (85:15) gouge mixtures derived from natural mafic metamorphic rocks, under hydrothermal conditions using a ring shear deformation apparatus. Experiments were performed at effective normal stresses (σn eff) of 50–200 MPa, pore fluid pressures (Pf) of 50–200 MPa, at temperatures (T) of 23–600 °C. In each experiment we applied a shear displacement (x) of ~10 mm at a constant sliding velocity (v) of 10 μm/s, followed by v-stepping in the range 0.3–100 μm/s, and slide-hold-slide (SHS) tests with hold times (t) ranging from 3 s to 3000 s. We quantified the rate- and state-dependent friction parameter (a-b), and investigated the effect of t on fault healing (Δμpk). The results showed no effects of temperature on the coefficient of friction (μ ≈ 0.6–0.7), or on (a-b), with some experiments showing persistent, displacement-hardening or -weakening trends. Nonetheless, effects of v and of normal stress (σn = σn eff + Pf) on (a-b) fall into three temperature regimes: (1) T = 23–100 °C, (2) T = 200–400 °C, and (3) T = 500–600 °C. In Regimes (1) and (3), (a-b) > 0 for all conditions tested, whereas in Regime (2), (a-b) ≤ 0, at σn eff = Pf = 50 MPa and v = 0.3–3 μm/s. We discuss on the origin of persistent displacement-hardening or -weakening trends observed, and assess the implications of our data for subduction zone seismogenesis. Extrapolation of (a-b)-data using multiple linear regression suggests that high pore pressure ratios (>0.9) are needed to promote seismogenesis in faults cutting actinolite-chlorite compositions. © 2020 Elsevier B.V. |
| 关键词 | ActinoliteChloriteEarthquakeFrictionMegathrustSubduction |
| 英文关键词 | Earthquakes; Fault slips; Hardening; Linear regression; Metamorphic rocks; Shear flow; Temperature; Actinolite; Chlorite; Coefficient of frictions; Hydrothermal conditions; Megathrust; Multiple linear regressions; Subduction; Subduction zone seismogenesis; Friction; chlorite; deformation; earthquake event; fault gouge; fault slip; friction; hydrothermal system; shear zone; subduction zone; thrust |
| 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/207838 |
| 作者单位 | Department of Natural History Sciences, Graduate School of Sciences, Hokkaido University, Sapporo, 060-0810, Japan; Department of Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht, CD 3584, Netherlands; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan |
| 推荐引用方式 GB/T 7714 | Okamoto A.S.,Niemeijer A.R.,Takeshita T.,et al. Frictional properties of actinolite-chlorite gouge at hydrothermal conditions[J],2020,779. |
| APA | Okamoto A.S.,Niemeijer A.R.,Takeshita T.,Verberne B.A.,&Spiers C.J..(2020).Frictional properties of actinolite-chlorite gouge at hydrothermal conditions.Tectonophysics,779. |
| MLA | Okamoto A.S.,et al."Frictional properties of actinolite-chlorite gouge at hydrothermal conditions".Tectonophysics 779(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
