气候变化领域集成服务门户(CCPortal): The middle Cretaceous (110–94 Ma) Evolution of Tangza Basin in the Western Tibetan Plateau and Implications for Initial Topographic Growth of Northern Lhasa

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DOI	10.1130/B35708.1
	The middle Cretaceous (110–94 Ma) Evolution of Tangza Basin in the Western Tibetan Plateau and Implications for Initial Topographic Growth of Northern Lhasa
	Han X.; Dai J.-G.; Lin J.; Xu S.-Y.; Liu B.-R.; Wang Y.-N.; Wang C.-S.
发表日期	2021
ISSN	167606
起始页码	1283
结束页码	1300
卷号	133
英文摘要	Reconstruction of Cretaceous geological evolution of Tibetan Plateau growth is critical for assessing the effect of India-Asia collision on the formation of its high elevation. However, Cretaceous topographic evolution and geodynamic mechanism in northern Lhasa remain ambiguous. Here we present results from sedimentology, zircon U-Pb ages, and detrital Cr-spinel composition of the Tangza Formation in the western part of northern Lhasa. Sedimentary lithofacies document that orbitolinid foraminifera–limestone beds were deposited in a shallow-marine setting, while clastic rocks accumulated in an alluvial fan during the middle Cretaceous. Zircon U-Pb ages of interbedded volcanic rocks place a robust constraint on the initiation of clastic rock deposition at ca. 106 Ma. Sandstones are enriched lithic fragments with abundant volcanic grains. U-Pb ages of detrital zircon display a prominent age population at 101–130 Ma with a 120 Ma peak. These data indicate that the clastic rocks were mainly derived from northern Lhasa, including an Early Cretaceous magmatic arc. Sedimentary and provenance characteristics are most consistent with deposition in a local foreland basin. The activation of south-vergent local thrusting may be responsible for loading of the Tangza foreland basin. This thrust faulting may be associated with crustal shortening induced by the continuous convergence of Lhasa and Qiangtang since collision initiated during the Early Cretaceous. The initial uplift of western and central parts of northern Lhasa and eastern Gangdese arc occurred at ca. 106 Ma, while the widespread uplift of northern and central Lhasa probably initiated at ca. 92 Ma. The mid–Late Cretaceous uplift in Lhasa was significantly earlier than the early Cenozoic India-Asia collision. © 2020 Geological Society of America
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/184670
作者单位	School of Earth Sciences and Resources,, Research Center for Tibetan Plateau Geology, China University of Geosciences, Beijing, 100083, China; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing, 100083, China
推荐引用方式 GB/T 7714	Han X.,Dai J.-G.,Lin J.,等. The middle Cretaceous (110–94 Ma) Evolution of Tangza Basin in the Western Tibetan Plateau and Implications for Initial Topographic Growth of Northern Lhasa[J],2021,133.
APA	Han X..,Dai J.-G..,Lin J..,Xu S.-Y..,Liu B.-R..,...&Wang C.-S..(2021).The middle Cretaceous (110–94 Ma) Evolution of Tangza Basin in the Western Tibetan Plateau and Implications for Initial Topographic Growth of Northern Lhasa.Bulletin of the Geological Society of America,133.
MLA	Han X.,et al."The middle Cretaceous (110–94 Ma) Evolution of Tangza Basin in the Western Tibetan Plateau and Implications for Initial Topographic Growth of Northern Lhasa".Bulletin of the Geological Society of America 133(2021).