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DOI	10.1016/j.tecto.2020.228644
	Friction properties of hornblende and implications for slow-slip events in subduction zones
	Liu Y.; He C.
发表日期	2020
ISSN	00401951
卷号	796
英文摘要	In order to understand the friction properties of amphibole as a primary constituent mineral in subduction zones, we used hornblende as the simulated gouge material to conduct two series of shearing experiments at temperatures from 101 to 607 °C under confining pressures of 136 MPa and 83 MPa, a pore pressure of 30 MPa and loading rates of 0.0488–1.22 μm/s. Steady-state friction coefficients in the high confining pressure series exhibited values between 0.70 and 0.72 with an average of ~0.71, without showing a systematic temperature dependence. The counterpart in the low confining pressure series ranged from 0.67 to 0.73 and exhibited a temperature-dependent decline for temperatures above 400 °C. Velocity-weakening behaviors were observed at 303, 505 and 607 °C in the high confining pressure series, and at 303 and 403 °C in the low confining pressure series. The \|a-b\| parameter associated with velocity weakening of hornblende in our high and low confining pressure experiments are 0.0005–0.0014 and 0.0014–0.0015, respectively. The b values, which represent the evolution effect in friction, were found to increase with increasing temperature, suggesting a thermally-activated process that produced creep at asperity. Ubiquitously precipitated particles in the deformed gouge suggest that dissolution-precipitation creep may be the most likely mechanism associated with the evolution effect and therefore velocity weakening. The very low velocity weakening observed for hornblende (\|a-b\| ≤ 0.0015) provides a favorable condition for nucleation of slow-slip events to occur in subduction zones over a wider range of effective normal stress. © 2020 Elsevier B.V.
关键词	Hornblende Slow slips Subduction zones Velocity weakening
英文关键词	Creep; Friction; Precipitation (chemical); Temperature distribution; Velocity; Dissolution precipitations; Effective normal stress; Friction coefficients; High confining pressure; Increasing temperatures; Low confining pressure; Temperature dependence; Thermally activated process; Rock pressure; confining pressure; dissolution; hornblende; parameter estimation; subduction zone; tectonic evolution; tectonic setting
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/207815
作者单位	State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China
推荐引用方式 GB/T 7714	Liu Y.,He C.. Friction properties of hornblende and implications for slow-slip events in subduction zones[J],2020,796.
APA	Liu Y.,&He C..(2020).Friction properties of hornblende and implications for slow-slip events in subduction zones.Tectonophysics,796.
MLA	Liu Y.,et al."Friction properties of hornblende and implications for slow-slip events in subduction zones".Tectonophysics 796(2020).