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2023 Vol. 50, No. 5
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LIU Yiming, ZHAI Qingguo, TANG Yue, HU Peiyuan, YANG Ning, LI Jinyong. 2023. Identification of Gondwana tillite in the Bange County of Tibetan Plateau and its implications for the tectonic evolution of North Lhasa terrane—New evidence from the 1: 50000 thematic geological survey[J]. Geology in China, 50(5): 1486-1494. doi: 10.12029/gc20221024003
Citation: LIU Yiming, ZHAI Qingguo, TANG Yue, HU Peiyuan, YANG Ning, LI Jinyong. 2023. Identification of Gondwana tillite in the Bange County of Tibetan Plateau and its implications for the tectonic evolution of North Lhasa terrane—New evidence from the 1: 50000 thematic geological survey[J]. Geology in China, 50(5): 1486-1494. doi: 10.12029/gc20221024003
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Identification of Gondwana tillite in the Bange County of Tibetan Plateau and its implications for the tectonic evolution of North Lhasa terrane—New evidence from the 1: 50000 thematic geological survey

  • Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

    • Fund Project: Supported by the projects of Chinese Geological Survey (No.DD20221630, No.DD20230340), Second Tibetan Plateau Scientific Expedition and Research (STEP) (No.2019QZKK0703), Special Fund by Basic Research expenses of the Chinese Academy of Geological Sciences (No.JKYQN202308, No.JKYZD202305) and Basic Research Fund by the Institute of Geology of the Chinese Academy of Geological Sciences (No.J2202)
More Information
  • Author Bio: LIU Yiming, male, born in 1989, associate researcher, mainly engaged in the research of tectonic evolution of Tethys Ocean in Tibet Plateau; E-mail: michael_yatmingliu@foxmail.com
  • Corresponding author: ZHAI Qingguo, male, born in 1980, researcher, mainly engaged in the research of regional tectonics of Tibet Plateau and geotectonics; E-mail: zhaiqingguo@126.com 
Received Date:  24 October 2022
Revised Date:  03 May 2023
Publish Date:  25 October 2023
    Abstract

  • This paper is the result of geological survey engineering.

     Objective

    As the main terrane in the Tibetan Plateau, the division of the Lhasa terrane is significance for the spatial and temporal distribution pattern of the Tethys Ocean. Generally, it can be further divided into the North, Central, and South Lhasa terranes. However, it is still ambiguous about their basement nature, drifting, accretion, and tectonic affinity.

     Methods

    In this paper, based on the 1:50000 geological survey in the Beila area, North Lhasa terrane, the widely exposed and typical tillite and seismite are newly identified from the Middle-Upper Jurassic Lagongtang Formation, northern Tibetan Plateau.

     Results

    They can be compared with the Upper Carboniferous-Lower Permian Lagar Formation in the Xainza area, Central Lhasa terrane, indicating the Late Paleozoic glacial event in the northern margin of the Gondwana. The glacial marine gravels, formed by ice raft, are distributed in the sandy, silty and argillaceous matrix, with falling structure. Seismites are mainly seismic corrugated and shattering, with syngenetic or parasyngenetic seismic sedimentary records of microfolds, sand (mud) veins, coseismic joints, intraclastpara-breccia, steplike faults and flame structures.

     Conclusions

    The identification of the tillite of Lagar Formation indicates that the North Lhasa terrane holds similar basement with the Central Lhasa terrane. It is probably anaccretion-induced micro-block formed gradually on the basis of local continental crust, which is closely related to the subduction process of the Bangong-Nujiang Tethys Ocean. This provides key evidence for further studying the tectonic affinity of the North Lhasa terrane.
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