The Upper Permian volcanic-sedimentary succession in northern Qamdo Block, central Qinghai-Tibet Plateau and its sedimentary, paleogeographic and tectonic significance
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A combined sedimentological and geochemical study has been carried out on a volcanic-sedimentary succession from a borehole newly drilled in the northern Qamdo Block (QMB, in central Qinghai-Tibet Plateau) in order to improve the knowledge of the sedimentary and tectonic environment. The lithologic data allow to separate four main lithofacies, including massive volcanic lithofacies (LF1), tuffaceous lithofacies (LF2), sandstone lithofacies (LF3) and mudstone lithofacies (LF4). LF1 likely reflects the products of felsic lava flows that were formed during the process of magma ascent onto the seafloor at an earlier stage. LF2 contains two sublifhofacies that respectively represents the proximal and distal accumulation of tuffaceous turbidity flows. LF3 could be the arc-sourced submarine fan deposits, and the sublithofacies LF3a and LF3b represent mid-fan distributaries and interchannel deposits in fan lobes. LF4 is mainly composed of suspension deposits, which represents the sedimentation of post-volcanic activities. Furthermore, the lithofacy associations reveal the evolution of a volcano-sourced submarine fan in the back-arc basin. Geochemically, LF1 and LF2 are characterized by LREE-enriched patterns with negative Eu anomalies, enrichment in large ion lithophile elements (LILEs) and depletion in high-field-strength elements (HFSEs), which correspond with the previously published island arc environment. However, LF2 shows more distinctive patterns, which represents a later evolution stage than that of LF1. This volcanic-sedimentary succession reveals that the sedimentary-tectonic setting could be consistent with the subduction of Jinshajiang oceanic slab in the late Permian period.
KeywordsVolcanic-sedimentary succession Submarine fan Late Permian Central Qinghai-Tibet Plateau
Thanks to Antonio Herrero-Hernández, Abdullah M. Al-Amri, Domenico Doronzo, and another anonymous reviewer for reviewing and assisting the manuscript.
This study was financially supported by China Geological Survey (grant number GZH201400301) and Open Fund of Key Laboratory of Exploration and Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education (grant number K2018-07).
- Deng Z, An Y, Wang Q, An S (2014) Regional geological survey of the People’s Republic of China - the Tuotuo River map sheet (I46C002002). China University of Geosciences Press, Wuhan (in Chinese)Google Scholar
- Houghton B, Carey RJ (2015) Pyroclastic fall deposits, The Encyclopedia of Volcanoes. Elsevier, pp 599–616. https://doi.org/10.1016/B978-0-12-385938-9.00034-1 CrossRefGoogle Scholar
- Kong L, Yao H, Xu Y, Luo M, Luo L, Wu J (2014) Evolution of sedimentary basins in Qiangtang-Sanjiang from Paleozoic to Mesozoic. Earth Sci J China Univ Geosci 39:1217–1229 (in Chinese with English abstract)Google Scholar
- Li L, Bai Y, Niu Z (2010) Geochemical characteristics and tectonic environment of the Middle Permian volcanics in Zhiduo-Zaduo area, southern Qinghai province. Geol Surv Res 33(2):97–102 (in Chinese with English abstract)Google Scholar
- Lowe DR (1982) Sediment gravity flows: II. Depositional models with special reference to the deposits of high-density turbidity currents. J Sediment Petrol 52:279–297Google Scholar
- Ma L, Niu Z, Bai Y, Duan Q, Wang J (2007) Sr, Nd and Pb isotopic geochemistry of Permian volcanic rocks from southern Qinghai and their geological significance. Earth Sci J China Univ Geosci 32:22–28 (in Chinese with English abstract)Google Scholar
- Mutti E, Normark WR (1991) An Integrated Approach to the Study of Turbidite Systems, in: Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems. Springer, New York, pp 75–106Google Scholar
- Niu Z, Duan Q, Wang J, He L, Bai Y (2010) Early Permian (Cisuralian) Lithostratigraphical succession in volcanic-sedimentary setting from southern Qinghai. Earth Sci J China Univ Geosci 35:11–21 (in Chinese with English abstract)Google Scholar
- Niu Z, Wu J, Duan Q, Bai Y, Ma L, Zhao X, He L (2011) Permian tectonic setting of southern Qinghai and its tectonic evolution. Geol Rev 57:609–622 (in Chinese with English abstract)Google Scholar
- Qi S, Wang Y, He S, Song S, Qi Z, Wang F (2009) The assurance of syncollisional granite in Tanggula area during Late Permian epoch and its significance. Northwest Geol 42:26–35 (in Chinese with English abstract)Google Scholar
- Sun X, Jian P (2004) The Wilson Cycle of the Jinshajiang Paleo-Tethys Ocean, in Western Yunnan and Western Sichuan Provinces. Geol Rev 50:343–350 (in Chinese with English abstract)Google Scholar
- Walker RG (1978) Deep-water sandstone facies and ancient submarine fans: models for exploration for stratigraphic traps. AAPG Bull 62:932–966Google Scholar
- Wang C, Liu L, Wang YH, He SP, Li RS, Li M, Yang WQ, Cao YT, Collins AS, Shi C, Wu ZN (2015) Recognition and tectonic implications of an extensive Neoproterozoic volcano-sedimentary rift basin along the southwestern margin of the Tarim Craton, northwestern China. Precambrian Res 257:65–82CrossRefGoogle Scholar
- White J, Mcphie J, Soule SA (2015) Submarine lavas and hyaloclastite, The Encyclopedia of Volcanoes. Elsevier, pp 363–375Google Scholar
- Zhao X, Wang J, Niu Z, Tang Z, Yao H (2008) Discussion on the tectonic setting and geochemical characteristics of sandstones from Carboniferous to Triassic in Zhidoi-Zadoi area, Southern Qinghai. Acta Sedimentol Sin 26:11–20 (in Chinese with English abstract)Google Scholar
- Zhu Y, Tian J, Bai H, Yu C, Zhang X, Xiao L, Cao T (2009) Lithofacies palaeogeography of the Carboniferous–Triassic in Qinghai Province. J Palaeogeogr 11:384–392 (in Chinese with English abstract)Google Scholar