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Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet
Tang, MY (Tang, Maoyun)1,2; Liu-Zeng, J (Liu-Zeng, Jing)1; Hoke, GD (Hoke, Gregory D.)3; Xu, Q (Xu, Qiang)4,5; Wang, WT (Wang, Weitao)1; Li, ZF (Li, Zhanfei)1; Zhang, JY (Zhang, Jinyu)1; Wang, W (Wang, Wei)1; Liu-Zeng, J
Source PublicationTECTONOPHYSICS
AbstractThe 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.
Subject Area地球物理学
WOS IDWOS:000409284500014
Indexed BySCI
KeywordEast-central Tibet Stable-isotope Paleoaltimetry Soil Carbonate Formation Indo-asian Collision Lower Crustal Flow Hoh Xil Basin Late Miocene Pedogenic Carbonates Southwestern Tibet Plateau Uplift
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics ; Geochemistry & Geophysics
Cooperation Status国际
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Document Type期刊论文
Corresponding AuthorLiu-Zeng, J
Affiliation1.China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China.
2.Earthquake Adm Chong Qing, Chongqing 401147, Peoples R China.
3.Syracuse Univ, Dept Earth Sci, Syracuse, NY USA.
4.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
5.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.
Recommended Citation
GB/T 7714
Tang, MY ,Liu-Zeng, J ,Hoke, GD ,et al. Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet[J]. TECTONOPHYSICS,2017,712(0):170-181.
APA Tang, MY .,Liu-Zeng, J .,Hoke, GD .,Xu, Q .,Wang, WT .,...&Liu-Zeng, J.(2017).Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet.TECTONOPHYSICS,712(0),170-181.
MLA Tang, MY ,et al."Paleoelevation reconstruction of the Paleocene-Eocene Gonjo basin, SE-central Tibet".TECTONOPHYSICS 712.0(2017):170-181.
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