气候变化领域集成服务门户(CCPortal): Two Phases of Crustal Shortening in Northeastern Tibet as a Result of a Stronger Qaidam Lithosphere During the Cenozoic India-Asia Collision

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DOI	10.1029/2022TC007261
	Two Phases of Crustal Shortening in Northeastern Tibet as a Result of a Stronger Qaidam Lithosphere During the Cenozoic India-Asia Collision
	Xie, Renxian; Chen, Lin; Yin, An; Xiong, Xiong; Chen, Yongshun John; Guo, Zhen; Wang, Kai
发表日期	2023
ISSN	0278-7407
EISSN	1944-9194
卷号	42 期号:1
英文摘要	Although two phases of Cenozoic crustal deformation in the Qilian Shan thrust belt of northeastern Tibet has been documented, their dynamic causes remain unclear. To address this issue, we investigate whether the mechanical strength of the Qaidam Basin, which is located between the Eastern Kunlun Range and the Qilian Shan, was a controlling factor for the observed deformation history by performing 2-D thermal-mechanical simulations. Our models consider the division of the Tibetan terranes (i.e., Qilian arc, Kunlun-Qaidam, Songpan-Ganzi, Qiangtang, and Lhasa, from north to south) bounded by suture zones. Simulation results show that weak suture zones in central Tibet can lead to peeling off and sinking of the mantle lithosphere beneath the Qiangtang and Songpan-Ganzi terranes. After lithospheric delamination, varying north-south width, thickness and strength of the Qaidam crust creates three end-member model results: (a) the mantle lithosphere of the Lhasa terrane delaminates while the mantle lithosphere beneath Eastern Kunlun-Qaidam terrane and the Qilian Shan thrust belt (KQQ) remains undeformed, (b) the Lhasa mantle lithosphere moves northward while the KQQ mantle lithosphere subducts southward, and (c) the Lhasa mantle lithosphere moves northward while lithospheric thickening occurs north of the Qaidam Basin. Our simulations show that pre-existing weaknesses in northeastern Tibet can be activated and deformed shortly after the onset of collision, and a second wave of deformation sweeps across northeastern Tibet after lithospheric delamination in northern Tibet.
英文关键词	TECTONIC EVOLUTION; UPPER-MANTLE; QILIAN SHAN; NORTH TIBET; PLATEAU; SUBDUCTION; GROWTH; DEFORMATION; GEOCHRONOLOGY; RHEOLOGY
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001133115000001
来源期刊	TECTONICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282929
作者单位	Southern University of Science & Technology; Hong Kong Branch of the Southern Marine Science & Engineering Guangdong Laboratory (Guangzhou); Chinese Academy of Sciences; Institute of Geology & Geophysics, CAS; University of California System; University of California Los Angeles; China University of Geosciences - Wuhan; Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Xie, Renxian,Chen, Lin,Yin, An,et al. Two Phases of Crustal Shortening in Northeastern Tibet as a Result of a Stronger Qaidam Lithosphere During the Cenozoic India-Asia Collision[J],2023,42(1).
APA	Xie, Renxian.,Chen, Lin.,Yin, An.,Xiong, Xiong.,Chen, Yongshun John.,...&Wang, Kai.(2023).Two Phases of Crustal Shortening in Northeastern Tibet as a Result of a Stronger Qaidam Lithosphere During the Cenozoic India-Asia Collision.TECTONICS,42(1).
MLA	Xie, Renxian,et al."Two Phases of Crustal Shortening in Northeastern Tibet as a Result of a Stronger Qaidam Lithosphere During the Cenozoic India-Asia Collision".TECTONICS 42.1(2023).