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LI Jiqing, ZHANG Xinli, WANG Tao, LI Qing, WANG Taishan, XUE Wanwen. 2021. Zircon U-Pb Dating and Geochemical Characteristics of Granite Porphyry in Zhanhongshan Area, East Kunlun. Northwestern Geology, 54(1): 30-40. doi: 10.19751/j.cnki.61-1149/p.2021.01.003
Citation: LI Jiqing, ZHANG Xinli, WANG Tao, LI Qing, WANG Taishan, XUE Wanwen. 2021. Zircon U-Pb Dating and Geochemical Characteristics of Granite Porphyry in Zhanhongshan Area, East Kunlun. Northwestern Geology, 54(1): 30-40. doi: 10.19751/j.cnki.61-1149/p.2021.01.003
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Zircon U-Pb Dating and Geochemical Characteristics of Granite Porphyry in Zhanhongshan Area, East Kunlun

  • Qinghai Geological Survey Institute, Key Laboratory of Geological Processes and Mineral Resources in Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China

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Received Date:  10 April 2020
Revised Date:  16 October 2020
    Abstract
  • Based on the field investigation of granite porphyry in Zhanhongshan area of East Kunlun, zircon U-Pb dating and geochemical study show that the granite porphyry has a diagenetic age of (243.4 ±1.5) Ma (MSWD=0.99), belonging to the Middle Triassic. The geochemical characteristics of the rocks show that the SiO2 ranges from 73.82% to 75.65%, K2O/Na2O=0.61-0.95, relatively rich in sodium, poor in MnO (0.05%~0.06%), P2O5 (0.05%) and TiO2 (0.17%~0.2%). The A/CNK value is 1~1.09, with an average of 1.053. Al2O3 is between 12.02%~13.12%. The values of δ are 1.61~1.89. TFeO/MgO is 2.44~2.54 and DI is 91.2~92.64. All these show that it is a highly fractionated I-type granite of peraluminous and calc-alkaline series. The total REE content of the rocks is low (∑REE=134.89×10-6~165.65×10-6), LREE/HREE=7.99~8.85, (La/Yb)N=9.9~11.21. The fractionation of LREE and HREE is obvious, showing a right dipping curve of LREE enrichment and HREE depletion.δEu is 0.58~0.66. The rocks are characterized by a relative enrichment of large ion lithophiles of Rb, Ba and high field strength elements of U, Th, Pb, whereas a depletion of K, P and Ti. Combined with the diagenetic age, geochemical characteristics and regional tectonic evolution,the authors hold that the rocks formed in the collision environment of the northward subduction of the PaleoTethys ocean.
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