气候变化领域集成服务门户(CCPortal): Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet

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DOI	10.1016/j.tecto.2017.05.018
	Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet
	Tang, Maoyun; Liu-Zeng, Jing; Hoke, Gregory D.; Xu, Qiang; Wang, Weitao; Li, Zhanfei; Zhang, Jinyu; Wang, Wei
通讯作者	Liu-Zeng, J (通讯作者)
发表日期	2017
ISSN	0040-1951
EISSN	1879-3266
起始页码	170
结束页码	181
卷号	712
英文摘要	The topography evolution of the southeastern Tibetan Plateau provides a constraint for evaluating various geodynamic models of plateau formation. We reconstruct the Paleocene to Eocene paleoelevation of the Cenozoic Gonjo basin in the Qiangtang terrane, using oxygen and carbon stable isotopic results from pedogenic carbonates of the lower Ranmugou Formation. Lithofacies associations indicate that the lower Ranmugou Formation was deposited in alluvial fan and fluvial floodplain environments. U-Pb dating of volcanics within the middle Ranmugou Formation constrains the deposition of the lower Ranmugou Formation as prior to 43.2 Ma. Paleoelevations are calculated using both a thermodynamic model and an empirical relationship. The empirical relationship of elevation-delta O-18 is determined from a series of modern water samples. Calculated paleoelevations indicate that the Gonjo basin attained a minimum average elevation of 2100-2500 m in the early Eocene. Together with recent paleoaltimetry studies in the region, it can be concluded that the crust of southeastern Tibetan Plateau was already thickened by that time. The calculation is based on the section in northern Gonjo basin, where delta O-18 values of paleosol nodules appear to be unaltered, but we cannot rule out the possibility that delta O-18 values of the pedogenic carbonates had been partially reset. Our preliminary results favor tectonic models compatible with pre-Miocene uplift of the SE-central Tibetan Plateau. (C) 2017 The Authors. Published by Elsevier B.V.
关键词	STABLE-ISOTOPE PALEOALTIMETRY SOIL CARBONATE FORMATION INDO-ASIAN COLLISION HOH XIL BASIN EASTERN TIBET PLATEAU UPLIFT SOUTHERN TIBET LATE MIOCENE EVOLUTION MARGIN
英文关键词	Paleoelevation; Stable isotope; Southeast Tibetan Plateau; Paleocene-Eocene
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000409284500014
来源期刊	TECTONOPHYSICS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258983
推荐引用方式 GB/T 7714	Tang, Maoyun,Liu-Zeng, Jing,Hoke, Gregory D.,et al. Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet[J]. 中国科学院青藏高原研究所,2017,712.
APA	Tang, Maoyun.,Liu-Zeng, Jing.,Hoke, Gregory D..,Xu, Qiang.,Wang, Weitao.,...&Wang, Wei.(2017).Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet.TECTONOPHYSICS,712.
MLA	Tang, Maoyun,et al."Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet".TECTONOPHYSICS 712(2017).