气候变化领域集成服务门户(CCPortal): Mixed-Mode Formation of Amorphous Materials in the Creeping Zone of the Chihshang Fault, Taiwan, and Implications for Deformation Style

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DOI	10.1029/2020JB019862
	Mixed-Mode Formation of Amorphous Materials in the Creeping Zone of the Chihshang Fault, Taiwan, and Implications for Deformation Style
	Wu W.-J.; Kuo L.-W.; Ku C.-S.; Chiang C.-Y.; Sheu H.-S.; Aprilniadi T.D.; Dong J.-J.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	Experimental results demonstrate that amorphous materials can be generated by frictional sliding at a wide range of conditions and that once formed the frictional strength of the fault is reduced. Nevertheless, amorphous materials have not been described in many natural faults, and their importance in natural systems is not well understood. We have identified amorphous materials within a 3-mm-thick slip zone (i.e., narrow band) in the Chihshang Fault, Taiwan, as well as within a submicrometer thick band in a distributed network of scaly clays. The scaly clays resemble those developed in other faults that demonstrably accommodated slow creep, and they also impart very low permeability implying that fluid-related alteration (which could result in amorphization) will be inefficient. For this reason, and because of its throughgoing nature and position within a deforming zone, we infer a shear-related origin for the amorphous materials. Therefore, amorphous materials can be observed in near-surface environments because they have been formed during recent deformation under limited fluid-circulation circumstances. The narrow slip zone containing amorphous materials is throughgoing and is interpreted to have acted as a frictional interface that accommodated brittle deformation at the macroscopic scale, whereas the surrounding mélange accommodated distributed “ductile” shear. The formation of amorphous materials therefore typifies the “mixed-mode” style of deformation in this creeping fault zone. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	amorphous materials; creeping; deformation; Lichi Mélange; scaly clay; strain localization
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187821
作者单位	Department of Earth Sciences, National Central University, Taoyuan, Taiwan; Earthquake-Disaster & Risk Evaluation and Management Center, National Central University, Taoyuan, Taiwan; National Synchrotron Radiation Research Centrer, Hsinchu, Taiwan; Graduate Institute of Applied Geology, National Central University, Taoyuan, Taiwan
推荐引用方式 GB/T 7714	Wu W.-J.,Kuo L.-W.,Ku C.-S.,et al. Mixed-Mode Formation of Amorphous Materials in the Creeping Zone of the Chihshang Fault, Taiwan, and Implications for Deformation Style[J],2020,125(6).
APA	Wu W.-J..,Kuo L.-W..,Ku C.-S..,Chiang C.-Y..,Sheu H.-S..,...&Dong J.-J..(2020).Mixed-Mode Formation of Amorphous Materials in the Creeping Zone of the Chihshang Fault, Taiwan, and Implications for Deformation Style.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Wu W.-J.,et al."Mixed-Mode Formation of Amorphous Materials in the Creeping Zone of the Chihshang Fault, Taiwan, and Implications for Deformation Style".Journal of Geophysical Research: Solid Earth 125.6(2020).