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WANG Hongjie, CHEN Junlu, BAI Jianke, et al. LA-ICP-MS Zircon U-Pb Dating and Its Geological Implications of Post Collision Granite in the Sawuer Mountain[J]. Northwestern Geology, 2016, 49(2): 93-104.
Citation: WANG Hongjie, CHEN Junlu, BAI Jianke, et al. LA-ICP-MS Zircon U-Pb Dating and Its Geological Implications of Post Collision Granite in the Sawuer Mountain[J]. Northwestern Geology, 2016, 49(2): 93-104.
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LA-ICP-MS Zircon U-Pb Dating and Its Geological Implications of Post Collision Granite in the Sawuer Mountain

  • 1. Research Center for Orogenic Geology, Xi'an Center of Geological Survey, Geological Survey of China, Xi'an 710054, Shaanxi, China;

  • 2. China University of Geoscience(Beijing), Beijing 100083, Beijing, China

More Information
  • Received Date: May 22, 2015
  • Revised Date: December 25, 2015
  • Available Online: July 28, 2022
  • Published Date: June 04, 2016
    Graphical Abstract
    • Abstract
  • The Tasite pluton is located in the Sawuer Mountain of West Junggar, Jimunai County, Xinjiang.The pluton consists of granodiorite, monzonite granite, etc. According to U-Pb age analysis, the formation age of the granodiorite from the Tasite pluton is (332±1.9)Ma(the middle stage of Early Carboniferous).The geochemical studies indicate that the SiO2 contents vary from 64.03% to 66.44%, Na2O/K2O ratios change from 1.887 8 to 2.488 5, A/CNK ratios range from 1.7667 to 1.9204, which belongs to the I type granite. This pluton is enriched in LILE, such as Rb and K, and depleted in HFSE, such as Nb and Ti. The pluton has low ΣREE contents (54.68×10-6~57.56×10-6) and no Eu anomalies, with δEu values of 1.03~1.09and the (La/Sm)Nratiosvarying from 3.173 to 3.54. All of the geochemical features above show that the Sawuer Mountain in the middle stage of Early Carboniferous or the West Junggar are in post-collisional environment. The confirmation of post-collisional I type granites in the middle stage of Early Carboniferous provides new tectonic evolution evidence for the West Junggar region.
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