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DOI	10.1016/j.jseaes.2008.06.003
	Mechanical relation between crustal rheology, effective fault friction, and strike-slip partitioning among the Xiaojiang fault system, southeastern Tibet
	He, Jiankun; Lu, Shuangjiang; Wang, Xinguo
通讯作者	He, JK (通讯作者)
发表日期	2009
ISSN	1367-9120
EISSN	1878-5786
起始页码	363
结束页码	375
卷号	34 期号:3
英文摘要	The north-south trending Xiaojiang fault system accommodates similar to 10-12 mm/yr sinistral motions between southeastern Tibet and south China. In the south segment, the fault system composes mainly of four parallel strike-slip faults, namely from west to east, the Luzhijiang fault, the Yimen fault, the Puduhe fault, and the Xiaojiang fault. Geological and Seismological observations have shown that these strike-slip faults are all of active, while the slip rates of the Luzhijiang, the Yimen, and the Puduhe faults are much less than that of the Xiaojiang fault. We use finite element modeling to explore the mechanical relation between crustal rheology, effective fault friction and long-term slip rate partitioning among the four parallel faults. The individual faults are simplified as vertical discontinuities embedded in the crust as geophysical explorations have predicted. A large number of models are tested, associating with variations of the crustal rheolohy and the effective fault friction of individual faults. Result shows that if crust bounding the faults trends to behave like rigid blocks and decoupled mechanically from underlying layer, the modeled result is hard to approximate slip rates of the individual faults. To better fit slip rates of the individual faults, viscous deformation of the lower crust should be included. With a heterogeneously viscous lower-crust model that is built upon thermal structure of the heat flow data, associating with relatively low effective friction of the Xiaojiang fault, the modeled results fit the geological slip rates well, with similar to 1-1.5 mm/yr for the Luzhijiang, the Yimen and the Puduhe faults, and similar to 6-6.5 mm/yr for the Xiaojiang fault. Thus, in the southward movement of the Tibetan plateau around the eastern Himalayan syntaxis, slip partitioning among the Xiaojiang fault system should be related to viscous deformation of the lower crust associated with different strength of the individual faults, highlighting that deformation of this fault system is coupled mechanically between the frictional upper crust and the viscous lower crust. (C) 2008 Elsevier Ltd. All rights reserved.
关键词	INDIA-ASIA COLLISION SAN-ANDREAS FAULT ACTIVE DEFORMATION LATERAL VARIATIONS LARGE EARTHQUAKES XIANSHUIHE FAULT YUNNAN PROVINCE UPPER-MANTLE HEAT-FLOW CHINA
英文关键词	Slip partitioning; Effective fault friction; Viscous lower crust; Mechanical modeling; Xiaojiang fault system
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000261710500012
来源期刊	JOURNAL OF ASIAN EARTH SCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257621
推荐引用方式 GB/T 7714	He, Jiankun,Lu, Shuangjiang,Wang, Xinguo. Mechanical relation between crustal rheology, effective fault friction, and strike-slip partitioning among the Xiaojiang fault system, southeastern Tibet[J]. 中国科学院青藏高原研究所,2009,34(3).
APA	He, Jiankun,Lu, Shuangjiang,&Wang, Xinguo.(2009).Mechanical relation between crustal rheology, effective fault friction, and strike-slip partitioning among the Xiaojiang fault system, southeastern Tibet.JOURNAL OF ASIAN EARTH SCIENCES,34(3).
MLA	He, Jiankun,et al."Mechanical relation between crustal rheology, effective fault friction, and strike-slip partitioning among the Xiaojiang fault system, southeastern Tibet".JOURNAL OF ASIAN EARTH SCIENCES 34.3(2009).