globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.115967
论文题名:
The role of metasomatic alteration on frictional properties of subduction thrusts: An example from a serpentinite body in the Franciscan Complex, California
作者: Hirauchi K.-I.; Yamamoto Y.; den Hartog S.A.M.; Niemeijer A.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531
语种: 英语
中文关键词: Franciscan Complex ; friction ; interplate coupling ; metasomatism ; serpentinite
英文关键词: Lithology ; Magnesite ; Mineralogy ; Slip forming ; Talc ; Velocity ; Effective normal stress ; Experimental conditions ; Franciscan Complex ; Frictional properties ; Interplate coupling ; Metasomatic alterations ; metasomatism ; Serpentinite ; Friction ; accretionary prism ; friction ; intraplate process ; metasomatism ; serpentinite ; silicon ; subduction ; thrust fault ; California ; United States
英文摘要: Fluid–rock interaction within accretionary prisms drastically changes the frictional strength and slip stability of the fault zone. In order to understand the effect of ultramafic components on the degree of interplate coupling, we present data on frictional properties of a reaction zone between serpentinite and argillite in a tectonic mélange of the Franciscan Complex, central California. Field and petrographic observations indicate that the argillite and serpentinite along the lithological boundary are metasomatized to tremolite and talc schists, respectively, forming a ductile shear zone. Simulated gouges made from fault and wall rock samples collected are sheared at effective normal stresses (σneff) of 60–180 MPa and temperatures (T) of 20–400C∘, using a hydrothermal ring shear machine. The serpentinite is frictionally strong (steady-state friction coefficient μss=0.5–0.6), and exhibits both velocity-weakening and velocity-strengthening behavior. The μss of the argillite and tremolite schist increases up to 0.7 and 0.6, respectively, with increasing σneff and T, while (a−b) transitions from positive to negative with increasing T. At a given experimental condition, μ and (a−b) values are lower and higher for the tremolite schist than for the argillite. In contrast, the talc schist exhibits very low friction (μss=0.1–0.2) and velocity-strengthening behavior at all experimental conditions tested. Our results demonstrate that Si-metasomatism along the argillite–serpentinite contact results in reduced friction and stabilized slip, forming frictionally weak, velocity-strengthening regions in the megathrust zone. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165027
Appears in Collections:气候变化与战略

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作者单位: Department of Geosciences, Faculty of Science, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan; Department of Mathematical Science and Advanced Technology, Japan Agency for Marine-Earth Science and Technology, Showa-machi 3173-25, Kanazawa-ku, Yokohama, 236-0001, Japan; The Lyell Centre, Heriot-Watt University, Research Avenue South, Edinburgh, EH14 4AP, United Kingdom; Department of Earth Sciences, Utrecht University, Budapestlaan 4, Utrecht, 3584 CD, Netherlands

Recommended Citation:
Hirauchi K.-I.,Yamamoto Y.,den Hartog S.A.M.,et al. The role of metasomatic alteration on frictional properties of subduction thrusts: An example from a serpentinite body in the Franciscan Complex, California[J]. Earth and Planetary Science Letters,2020-01-01,531
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