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2022 Vol. 55, No. 2
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LIU Jun, XI Chaozhuang, HUANG Bo, YANG Tao, XIA Haodong, DENG Huijuan. 2022. Geochronology, Geochemistry and Geological Significance of Thediorite in Datonggou Nanshanbei, Northwestern Qaidam Basin. Northwestern Geology, 55(2): 93-105. doi: 10.19751/j.cnki.61-1149/p.2022.02.007
Citation: LIU Jun, XI Chaozhuang, HUANG Bo, YANG Tao, XIA Haodong, DENG Huijuan. 2022. Geochronology, Geochemistry and Geological Significance of Thediorite in Datonggou Nanshanbei, Northwestern Qaidam Basin. Northwestern Geology, 55(2): 93-105. doi: 10.19751/j.cnki.61-1149/p.2022.02.007
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Geochronology, Geochemistry and Geological Significance of Thediorite in Datonggou Nanshanbei, Northwestern Qaidam Basin

  • 1. Xi'an Northwest Noferrous Geophysical-Geochemical Corps Ltd., Xi'an 710068, Shaanxi, China;

  • 2. School of Civil Engineering, Hunan City University, Yiyang 413000, Hunan, China;

  • 3. Geophysical Nonferrous Metals and Geochemical Survey, Non-ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou, Duyun 558000, Guizhou, China;

  • 4. College of Architecture and Urban Planning, Guizhou Institute of Technology, Guiyang 550000, Guizhou, China;

  • 5. Cores and Samples Center of Natural Resources, CGS, Yanjiao 065201, Hebei, China

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Received Date:  22 May 2021
Revised Date:  25 November 2021
    Abstract
  • The Datonggou Nanshanbei diorite body is located in the northwest Qaidam basin, with the main rock types quartz diorite, diorite and granodiorite, and it is characterized by high silicon, rich alkali, rich aluminum and poor titanium. A/CNK ranges from 1.52 to 1.57, more than 1.10, and belongs to strong peraluminous granite type. Light rare earth elements (LREE) is enriched while heavy rare earth elements is depleted, and there is negative Eu anomaly. The normalized curve is obviously right inclined, with the feature of enrichment of large ion lithophile elements Rb, Th, K and LREE and the relative depletion of high field strength elements Nb, Ti, Y, Yb. The elements such as Sr, P and Ti show a "V" shaped valley with obvious depletion. The geochemical study shows that the magma is derived from the crust-mantle mixed source mainly composed of arenaceous rocks, and the genetic type belongs to I-type granite. LA-ICP-MS zircon U-Pb dating shows that the zircon formation age is (270±3) Ma (MSWD=0.076), which is the product of magmatic activity in the Middle to Early Permian, and was formed in the island arc granite under subduction environment.
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