气候变化领域集成服务门户(CCPortal): Early Cenozoic Drainage Evolution and Surface Uplift of the Eastern Tibetan Plateau: Insights From the Ninglang Basin

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DOI	10.1029/2023GL105499
	Early Cenozoic Drainage Evolution and Surface Uplift of the Eastern Tibetan Plateau: Insights From the Ninglang Basin
	Zhao, Xudong; Zhang, Huiping; Lease, Richard O.; Wang, Ying; Pang, Jianzhang; Li, Yifei; Wang, Ping; Zhang, Jiawei; Xie, Hao; Wang, Yizhou; Tao, Yaling; Ma, Zifa; Xiong, Jianguo; Zhang, Peizhen
发表日期	2023
ISSN	0094-8276
EISSN	1944-8007
卷号	50 期号:19
英文摘要	The modern high topography of the eastern Tibetan Plateau is drained by several of the largest rivers on Earth, and exerts a prominent influence on the Asian monsoon pattern. However, when the high terrain was formed remains highly debated. Here, we present detrital zircon U-Pb ages that indicate a south-flowing drainage system with distal headwaters passed through the Ninglang Basin at ca. 45 Ma. We advocate for early-middle Eocene surface uplift in the Gonjo Basin and areas to the west creating a southeast tilted topography across eastern Tibet. The termination of sedimentation at ca. 40 Ma implies that the river system had deviated from the Ninglang Basin, which we interpret as a result of rise of the Yalong-Yulong thrust belt. Combined with other lines of evidence from previous studies, we support the establishment of moderate-high elevation topography of eastern Tibet by late Eocene time. The eastern Tibetan Plateau has been a hotspot for studying the interactions between tectonic uplift, monsoon evolution, Asian biodiversity, and topographic development during continental collision. However, the timing of high-elevation topography formation in eastern Tibet is a matter of debate, with age estimates ranging from middle Eocene to late Miocene. This directly leads to contradictory understanding of uplift processes and plateau growth mechanisms. Sedimentary basins are excellent recorders of past drainage pattern and tectonic process, while many Cenozoic basins in eastern Tibet have been understudied. Here we focus on the Ninglang Basin and carry out comprehensive research including stratigraphy, sedimentology, chronology, and provenance analysis. We indicate that the Ninglang Basin was mainly supplied by a south-flowing exterior drainage system during the middle Eocene, implying the existence of a regional, low-gradient landscape beveling to the southeast at that time. The extinction of this drainage system in late Eocene time likely means the initiation of the Yalong-Yulong thrust belt, a major boundary fault system in eastern Tibet. Our study thus support that the topography of eastern Tibet has been elevated in the late Eocene. A large-scale, south-flowing fluvial system drained through the Ninglang Basin during the middle EoceneThe demise of the Ninglang Basin in the late Eocene resulted from the uplift of the Yalong-Yulong thrust beltThe elevated terrain of eastern Tibet was initially formed in the late Eocene
关键词	eastern Tibet drainage evolution detrital zircon surface uplift
英文关键词	FISSION-TRACK; YANGTZE BLOCK; SOUTH CHINA; TECTONIC EVOLUTION; RELIEF GENERATION; DETRITAL ZIRCONS; SONGPAN-GANZI; GONJO BASIN; MARGIN; AGE
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:001072667600001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283107
作者单位	China Earthquake Administration; Institute of Geology, CEA; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); United States Department of the Interior; United States Geological Survey; Nanjing Normal University; Sun Yat Sen University
推荐引用方式 GB/T 7714	Zhao, Xudong,Zhang, Huiping,Lease, Richard O.,et al. Early Cenozoic Drainage Evolution and Surface Uplift of the Eastern Tibetan Plateau: Insights From the Ninglang Basin[J],2023,50(19).
APA	Zhao, Xudong.,Zhang, Huiping.,Lease, Richard O..,Wang, Ying.,Pang, Jianzhang.,...&Zhang, Peizhen.(2023).Early Cenozoic Drainage Evolution and Surface Uplift of the Eastern Tibetan Plateau: Insights From the Ninglang Basin.GEOPHYSICAL RESEARCH LETTERS,50(19).
MLA	Zhao, Xudong,et al."Early Cenozoic Drainage Evolution and Surface Uplift of the Eastern Tibetan Plateau: Insights From the Ninglang Basin".GEOPHYSICAL RESEARCH LETTERS 50.19(2023).