气候变化领域集成服务门户(CCPortal): Carbonate stable and clumped isotopic evidence for late Eocene moderate to high elevation of the east-central Tibetan Plateau and its geodynamic implications

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DOI	10.1130/B32060.1
	Carbonate stable and clumped isotopic evidence for late Eocene moderate to high elevation of the east-central Tibetan Plateau and its geodynamic implications
	Li L.; Fan M.; Davila N.; Jesmok G.; Mitsunaga B.; Tripati A.; Orme D.
发表日期	2019
ISSN	167606
起始页码	831
结束页码	844
卷号	131 期号:2021-05-06
英文摘要	The topographic history of mountain belts reflects changes in lithospheric structure and rheology and exerts an influence on climate. Although substantial progress has been made to constrain the growth history of the southern Tibetan Plateau, the timing and geodynamic drivers for surface uplift of the central plateau remain poorly constrained. Here, we used both carbonate clumped isotope geothermometry and modified stable isotope-based paleoaltimetry that considers proportional mixing of two major moisture sources to infer late Eocene paleoelevations of the Nangqian Basin in the east-central Tibetan Plateau. The mean clumped isotope temperature, T(Δ47), of minimally altered late Eocene lacustrine carbonates is 30.0 °C, and the reconstructed least-evaporated paleo- water δ18Omw value is -9.8‰. These two independent approaches indicate that during late Eocene time, the Nangqian Basin floor was 2.7 (+0.6/-0.4) km above sea level, and the hypsometric mean elevation of surrounding mountains was 3.0 ± 1.1 km above sea level. These estimates are 1.1-1.2 km lower than their modern counterparts. The moderate to high late Eocene paleoelevation of the Nangqian Basin suggests that Eocene upper-crustal shortening and thickening can explain most, but not all, of the surface uplift of the east-central Tibetan Plateau. The additional 1.1-1.2 km (at most) of post-late Eocene elevation increase to the present height may have been a result of either lower-crustal flow or slab detachment. © 2018 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/184910
作者单位	Department of Earth and Environmental Sciences, University of Texas at Arlington, Arlington, TX 76019, United States; Department of Earth, Planetary, and Space Sciences, Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, University of California, Los Angeles, CA 90095, United States; European Institute of Marine Sciences (IUEM), Université de Brest, UMR 6538, Domaines Océaniques, Rue Dumont D'Urville, France; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Plouzané, 29280, France; Department of Earth Sciences, Montana State University, Bozeman, MT 59717, United States
推荐引用方式 GB/T 7714	Li L.,Fan M.,Davila N.,et al. Carbonate stable and clumped isotopic evidence for late Eocene moderate to high elevation of the east-central Tibetan Plateau and its geodynamic implications[J],2019,131(2021-05-06).
APA	Li L..,Fan M..,Davila N..,Jesmok G..,Mitsunaga B..,...&Orme D..(2019).Carbonate stable and clumped isotopic evidence for late Eocene moderate to high elevation of the east-central Tibetan Plateau and its geodynamic implications.Bulletin of the Geological Society of America,131(2021-05-06).
MLA	Li L.,et al."Carbonate stable and clumped isotopic evidence for late Eocene moderate to high elevation of the east-central Tibetan Plateau and its geodynamic implications".Bulletin of the Geological Society of America 131.2021-05-06(2019).