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 C.; Liu C.; Fan S.; Zuza A.V.; Ding L.; Liu W.; Ye B.; Yang S.; Zhou Z.
发表日期	2020
ISSN	167606
起始页码	1291
结束页码	1315
卷号	132 期号:2021-05-06
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 (~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 ~56-km-long balanced cross section across the western domain of the Eastern Kunlun suggests that Cenozoic minimum shortening strain was ~30% (~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 × 10--16 s--1 to 2.3 × 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 ~10 mm/yr slip rates.© 2020 Geological Society of America. All rights reserved.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184794
作者单位	Structural Geology Group, China University of Geosciences (Beijing), Beijing, 100083, China; Department of Earth and Atmospheric Sciences, University of Houston, Houston, Texas 77204, United States; Nevada Bureau of Mines and Geology, University of Nevada, Reno, Nevada 8957, United States; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, P.O. Box 9825, Beijing, 100085, China; Exploration and Development Research Institute of PetroChina, Liaohe Oilfield Company, Panjin, 124000, China
推荐引用方式 GB/T 7714	Wu C.,Liu C.,Fan S.,et al. Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet[J],2020,132(2021-05-06).
APA	Wu C..,Liu C..,Fan S..,Zuza A.V..,Ding L..,...&Zhou Z..(2020).Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet.Bulletin of the Geological Society of America,132(2021-05-06).
MLA	Wu C.,et al."Structural analysis and tectonic evolution of the western domain of the Eastern Kunlun Range, northwest Tibet".Bulletin of the Geological Society of America 132.2021-05-06(2020).