| DOI: | 10.1016/j.tecto.2020.228644
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| 论文题名: | Friction properties of hornblende and implications for slow-slip events in subduction zones |
| 作者: | Liu Y.; He C.
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| 刊名: | Tectonophysics
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| ISSN: | 00401951
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| 出版年: | 2020
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| 卷: | 796 | | 语种: | 英语
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| 中文关键词: | Hornblende
; Slow slips
; Subduction zones
; Velocity weakening
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| 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
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| 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. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/170648
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| Appears in Collections: | 气候变化与战略
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作者单位: | State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China
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| Recommended Citation: | |
Liu Y.,He C.. Friction properties of hornblende and implications for slow-slip events in subduction zones[J]. Tectonophysics,2020-01-01,796
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