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DOI	10.1016/j.lithos.2024.107536
	Cenozoic crustal thickness variations and surface uplift in the southeastern Tibetan Plateau: Insights from detrital zircon trace elements in the Gongga Shan region
	Zhao, Yanglin; Shen, Xiaoming; He, Zhiyuan; Wu, Xiong; Jia, Yingying; Tang, Xiudang
发表日期	2024
ISSN	0024-4937
EISSN	1872-6143
起始页码	470-471
卷号	470-471
英文摘要	The timing and mechanism of uplift in the southeastern Tibet Plateau have long been subjects of debate. The Gongga Shan region, positioned at the convergence of the Songpan-Ganzi, Chuandian, and Yangtze blocks, serves as a crucial vantage point for unraveling the evolutionary history of the southeastern Tibet Plateau. Nevertheless, the uplift history of the Gongga Shan region remains shrouded in uncertainty. By employing multivariate trace element ratios and reconstructing crustal thickness using zircon Eu/Eu*, our research has unveiled distinct periods of crustal thickening and thinning events. Within the time span of -240-160 Ma, a discernible thickening trend emerged from -35 to -45 km between -240 and - 215 Ma, followed by a relatively stable phase from -215 to -170 Ma, and subsequently a decline from -170 to -160 Ma, reducing the thickness from -45 to -30 km. In the period from -55 to -5 Ma, an initial increase in thickness occurred from -30 to -60 km between -55 and - 30 Ma, succeeded by an overall thinning from -60 to -35 km between -30 and - 10 Ma. Moreover, based on our reconstructed crustal thickness data, we have traced the paleo-elevation changes in the Gongga Shan region from the Cenozoic to the present, revealing a fluctuation from -0.5 to -4.5 km. We attribute the Triassic-Jurassic crustal thickening and subsequent thinning to the Triassic orogeny and post -collision extension following the closure of the Paleo-Tethys Ocean. Our findings further suggest that during the Eocene-Oligocene period, the Gongga Shan region experienced significant crustal thickening and surface uplift, indicative of intense compression. This phenomenon likely resulted from the northeast-directed compression of the IndianEurasian plate, causing substantial crustal shortening and thickening in specific areas of the southeastern Tibet Plateau, leading to rapid surface uplift. Subsequently, during the Oligocene-Miocene, the detachment and subsidence of the lithospheric mantle triggered rapid crustal thinning in the Gongga Shan region. This phase was accompanied by relatively stable and slight surface uplift, signifying a shift in the plateau uplift mode of the southeastern Tibet Plateau from compression to lateral extrusion.
英文关键词	Southeastern Tibetan Plateau; Gongga Shan; Detrital zircon; Crustal thickness; Uplift
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS记录号	WOS:001186777800001
来源期刊	LITHOS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/309951
作者单位	Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Ghent University
推荐引用方式 GB/T 7714	Zhao, Yanglin,Shen, Xiaoming,He, Zhiyuan,et al. Cenozoic crustal thickness variations and surface uplift in the southeastern Tibetan Plateau: Insights from detrital zircon trace elements in the Gongga Shan region[J],2024,470-471.
APA	Zhao, Yanglin,Shen, Xiaoming,He, Zhiyuan,Wu, Xiong,Jia, Yingying,&Tang, Xiudang.(2024).Cenozoic crustal thickness variations and surface uplift in the southeastern Tibetan Plateau: Insights from detrital zircon trace elements in the Gongga Shan region.LITHOS,470-471.
MLA	Zhao, Yanglin,et al."Cenozoic crustal thickness variations and surface uplift in the southeastern Tibetan Plateau: Insights from detrital zircon trace elements in the Gongga Shan region".LITHOS 470-471(2024).