Advances in Earth Science ›› 2011, Vol. 26 ›› Issue (10): 1092-1100. doi: 10.11867/j.issn.1001-8166.2011.10.1092

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Tectono-lithofacies-palaeogeography of the Cambrian in North Qilian Mountain-Alxa Area

You Weifeng 1, Zhang Haiqing 1,  Xiao Peixi 2,  Cao Xuanduo 2, Hu Yunxu 2, Xie Congrui 2   

  1. 1.Research Institute of Exploration and Production, Sinopec, Beijing100083, China;
    2. Xi′an Institute of Geology and Mineral Resource, Xi′an710054, China
  • Received:2010-06-28 Revised:2011-08-25 Online:2011-10-10 Published:2011-10-10

You Weifeng, Zhang Haiqing, Xiao Peixi, Cao Xuanduo, Hu Yunxu,Xie Congrui. Tectono-lithofacies-palaeogeography of the Cambrian in North Qilian Mountain-Alxa Area[J]. Advances in Earth Science, 2011, 26(10): 1092-1100.

Based on the vast field outcrop data analysis, integrated with the completed research achievements, stratigraphic division, structure evolution and sedimentary facies of the Cambrian in North Qilian Mountain Alxa area are studied. Redefining of the Xiangshan group and Hanmushan group, we define the age of Xianshan group as the Cambrian-Ordovician period and the age of Hanmushan group as the Sinian-Cambrian period. Four sedimentary facies types are recognized, there are coastal facies, neritic facies, bathyal-abyssal facies and abysmal  ocean basin facies. The tectono-lithofacies-palaeogeography maps of the Cambrian in the area are drawn on the basis of the above work. The tectono-lithofacies-palaeogeography inherited the Sinian pattern. The depositional area mainly distribute in the middle of old land and the margin of the old land. The region with different structural backgrounds presents different depositional environment. The sediments preserved in the area were all marine sediments.

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