气候变化领域集成服务门户(CCPortal): Late Cenozoic deformation along the northwestern continuation of the Xianshuihe fault system, Eastern Tibetan Plateau

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DOI	10.1130/B25833.1
	Late Cenozoic deformation along the northwestern continuation of the Xianshuihe fault system, Eastern Tibetan Plateau
	Wang, Shifeng; Fan, Chun; Wang, Gang; Wang, Erchie
通讯作者	Wang, SF (通讯作者)
发表日期	2008
ISSN	0016-7606
EISSN	1943-2674
起始页码	312
结束页码	327
卷号	120 期号:3-4
英文摘要	The Xianshuihe fault system is a highly active, left-lateral slip fault that has played an important role in accommodating late Cenozoic crustal deformation of the Eastern Tibetan Plateau. The left-lateral displacement on the western portion of the fault system, the Ganzi fault, is similar to 80 km, based on geologic and geomorphic markers. Left-lateral movement along the fault may have initiated in middle Miocene time (12 Ma), followed by the intensive, brittle, left-lateral movement in late Cenozoic time (2-4 Ma). Lying within the headwater regions of the Jinsha (Yangtze) River in the Yushu region, the northwestern end of the Xianshuihe fault system consists of four branches. These are, from north to south-the Dangjiang fault, the Yushu fault, the Batang fault, and the Xialaxiu fault. Both the Yushu and Dangjiang faults display clear geologic and geomorphic evidence for active, left-lateral slip movement. Several offset markers of Triassic age along the Dangjiang fault suggest similar to 39 km of left-lateral slip, but the geomorphic evidence along the Dangjiang and Yushu faults suggests only similar to 16 km and similar to 25 km of left-lateral slip, respectively. Both the Batang and Xialaxiu faults demonstrate clear evidence for normal dip slip, by an associated series of E-W-trending grabens and horsts that absorb similar to 9 km of left-lateral movement in early to middle Pleistocene time. About 32 km of left-lateral movement on the fault system was estimated to be absorbed by NE-SW shortening along the rugged North Yushu block in late Neogene time. This is interpreted to have formed as a rhomb-shaped restraining bend, along which the left-lateral movement along the northwestern end of the fault system was partially transferred into crustal shortening. The westward continuation of the Dangjiang fault is marked by an E-W-trending fault, which can be traced westward for 150 km to central Tibet, where it joins the Fenghuo Shan thrust belt. This thrust belt is interpreted to represent the northwestern continuation of the Xianshuihe fault system, along which 39 km of the left-lateral movement was entirely transferred into the N-S shortening. It indicates that the left-lateral movement within the southeastern part of the Tibetan Plateau along the fault system, either caused by lateral extrusion or by clockwise rotation, is largely restricted to the northwestern end of the fault system. Quaternary extension occurred along the northwestern continuation of the Xianshuihe-Xiaojiang fault was coeval with extension along its southern end, indicating that the southeastern margin of the plateau underwent clockwise rotation.
关键词	ACTIVE TECTONICS CONTINENTAL DEFORMATION EXTRUSION TECTONICS COLLISION ZONE RED-RIVER SLIP-RATE CHINA ASIA YUNNAN INDIA
英文关键词	Xianshuihe fault system; stream offset; late Cenozoic time; restraining bend; clockwise rotation
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000253750900004
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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/257536
推荐引用方式 GB/T 7714	Wang, Shifeng,Fan, Chun,Wang, Gang,et al. Late Cenozoic deformation along the northwestern continuation of the Xianshuihe fault system, Eastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2008,120(3-4).
APA	Wang, Shifeng,Fan, Chun,Wang, Gang,&Wang, Erchie.(2008).Late Cenozoic deformation along the northwestern continuation of the Xianshuihe fault system, Eastern Tibetan Plateau.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,120(3-4).
MLA	Wang, Shifeng,et al."Late Cenozoic deformation along the northwestern continuation of the Xianshuihe fault system, Eastern Tibetan Plateau".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 120.3-4(2008).