气候变化领域集成服务门户(CCPortal): Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet

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DOI	10.1130/B35388.1
	Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet
	Wu, Chen; Liu, Changfeng; Fan, Suoya; Zuza, Andrew, V; Ding, Lin; Liu, Wencan; Ye, Baoying; Yang, Shijie; Zhou, Zhiguang
通讯作者	Wu, C (通讯作者)
发表日期	2020
ISSN	0016-7606
EISSN	1943-2674
起始页码	1291
结束页码	1315
卷号	132 期号:5-6
英文摘要	The Tibetan Plateau, the largest highland on Earth, formed due to the collision of India-Asia over the past 50-60 m.y., and the evolution of the Tibetan Plateau impacts our knowledge of continental tectonics. Examination of the northernmost margin of the Tibetan Plateau is key to unravelling the deformation mechanisms acting in northern Tibet. The left-slip Altyn Tagh fault system defines the northwest margin of the Tibetan Plateau, separating the Western and Eastern Kunlun Ranges in the southwest. Both Cenozoic and pre-Cenozoic crustal deformation events at this junction between the Altyn Tagh and Kunlun Ranges were responsible for the construction of northwestern Tibet, yet the relative contribution of each phase remains unconstrained. The western domain of the Eastern Kunlun Range is marked by active NE-trending, left-slip deformation of the Altyn Tagh fault and an E-striking Cenozoic thrust system developed in response India-Asia collision. To better constrain the Paleozoic Altyn Tagh and Kunlun orogens and establish the Cenozoic structural framework, we conducted an integrated investigation involving detailed geologic mapping (similar to 1:50,000 scale), U-Pb zircon geochronology, and synthesis of existing data sets across northwestern Tibet. Our new zircon analyses from Paleoproterozoic-Cretaceous strata constrain stratigraphic age and sediment provenance and highlight Proterozoic-Paleozoic arc activity. We propose a tectonic model for the Neoproterozoic-Mesozoic evolution of northwestern Tibet wherein restoration of an similar to 56-km-long balanced cross section across the western domain of the Eastern Kunlun suggests that Cenozoic minimum shortening strain was similar to 30% (similar to 24 km shortening). Field evidence suggests this shortening commenced after ca. 25-20 Ma, which yields an average long-term shortening rate of 1.2-0.9 mm yr(-1) and strain rates of 4.7 x 10(-16) s(-1) to 2.3 x 10(-16) s(-1). Geometric considerations demonstrate that this contractional deformation did not significantly contribute to left-slip offset on the Altyn Tagh fault, which has similar to 10 mm/yr slip rates.
关键词	ALTYN-TAGH FAULT ZIRCON U-PB INDO-ASIAN COLLISION EARLY PALEOZOIC MAGMATISM VERTICAL-AXIS ROTATION ND ISOCHRON AGE QAIDAM BASIN SOUTH ALTYN NORTHERN MARGIN QILIAN SHAN
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000530917400025
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/260032
推荐引用方式 GB/T 7714	Wu, Chen,Liu, Changfeng,Fan, Suoya,et al. Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet[J]. 中国科学院青藏高原研究所,2020,132(5-6).
APA	Wu, Chen.,Liu, Changfeng.,Fan, Suoya.,Zuza, Andrew, V.,Ding, Lin.,...&Zhou, Zhiguang.(2020).Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6).
MLA	Wu, Chen,et al."Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020).