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Geoscience ›› 2022, Vol. 36 ›› Issue (05): 1193-1205.DOI: 10.19657/j.geoscience.1000-8527.2022.040

• Hydrocarbon-bearing Basins • Previous Articles     Next Articles

Division and Geological Evolution of Pre-Nanhua Tectonic Units in Qaidam Basin and Its Northern and Southern Margins

ZHANG Jinming1,2,3(), WANG Bingzhang1,2,3(), FU Yanwen1,2,3, TIAN Chengxiu1,2,3   

  1. 1. Qinghai Institute of Geological Survey,Xining,Qinghai 810012,China
    2. Qinghai Province Key Laboratory of Geological Process and Mineral Resources of Northern Qinghai-Tibet Plateau,Xining,Qinghai 810012,China
    3. Qinghai Engineering Research Center of Remote Sensing Big Data,Xining,Qinghai 810012,China
  • Received:2022-01-04 Revised:2022-04-19 Online:2022-10-10 Published:2022-11-03
  • Contact: WANG Bingzhang

Abstract:

Based on the comprehensive research and regional survey in recent years, we have studied the material composition, metamorphism and deformation of the Pre-Nanhua period in the Qaidam Basin and its northern and southern margins. Tectonic units in the Qaidam basin and its northern and southern margins are divided into five ancient land mass (i.e., Mesoproterozoic Huangyuan continental block, Neoarchean-Paleoproterozoic Quanji continental block, Paleoproterozoic Dakendaban continental block, Paleoproterozoic Jinshuikou continental block, and Mesoproterozoic Ningtuo continental block) and eight secondary structural units. The geological characteristics of each tectonic unit are discussed, and the geological process and evolution of the Qaidam Basin and its northern and southern margins in the pre-Nanhua geological stage are reconstructed. Compiling the key geological events in the region, tectonic evolution of the Qaidam basin and its northern and southern margin includes Neoarchean continental nuclei formation, Paleoproterozoic early rifting, the Late Paleoproterozoic-Mesoproterozoic ancient land mass formation, Early Neoproterozoic mid-stage intracontinental rifting, the Early Neoproterozoic continental convergence. Six Neoproterozoic continental riftings were in response to the global Kenorland, Columbia and Rodinia supercontinental cycle events.

Key words: structural unit, geological evolution, pre-Nanhua period, Qaidam Basin and its northern and southern margins

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