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WEI Xiaolin, ZENG Xiaoping, GAN Chenpin, et al. Geochemistry and Geological Significance of Intermediate-Acid Intrusive Rocks in Chaganganuo Area, East Kunlun[J]. Northwestern Geology, 2016, 49(2): 1-10.
Citation: WEI Xiaolin, ZENG Xiaoping, GAN Chenpin, et al. Geochemistry and Geological Significance of Intermediate-Acid Intrusive Rocks in Chaganganuo Area, East Kunlun[J]. Northwestern Geology, 2016, 49(2): 1-10.
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Geochemistry and Geological Significance of Intermediate-Acid Intrusive Rocks in Chaganganuo Area, East Kunlun

  • 1. College of Earth Sciences, Jilin University, Changcun 130061, Jilin, China;

  • 2. Qinghai Bureau of Geology Survey, Xining 810001, Qinghai, China;

  • 3. No. 3 Institute of Geology Mineral Exploration of Qinghai Province, Xining 810029, Qinghai, China

More Information
  • Received Date: November 15, 2015
  • Revised Date: January 27, 2016
  • Available Online: July 28, 2022
  • Published Date: June 04, 2016
    Graphical Abstract
    • Abstract
  • The Chaganganuo area is located in themiddle-east part of Qimantage Mountains, westernsectionof East Kunlun.The intermediate-acid intrusive rocks in this area are mainly granodiorite and adamellite intrusion, which are intruded into the Baishahe Group, varying from granodiorite to adamellite, with the increasing contents of SiO2 (65.22%~72.42%) and the decreasing values of Al2O3 (14.90%~16.79%), CaO (1.97%~4.20%) and MgO (0.61%~2.00%). Their Rittman indexesrange from 1.41 to 2.02, and the total alkali contents of K2O+Na2O are 5.04%~8.8%, belonging to high-K calcium-alkali series.The total REE contents are moderate, with ΣREE values of 69.78×10-6~148.9×10-6, and their REE patterns show enriched LREE and no Eu anomaly. Rb and Th elements in rocks are quiterich, while Nb, Zr, Ce, Ta and Hf elements are rich, but Y element is weakly loss.LA-ICP-MS zircon U-Pb dating shows that the formation ages of these rocks are (246.8±1.7)Ma, which belong to Middle Triassic.The geological characteristics mentioned above indicate that these intermediate-acidic intrusive rocks are I-type granites.Combining with regional geological information, it's shown that a large number of dark microgranular enclave contained in these granitic rocks, with the evidence of obvious magma-mixing characteristics.In Middle Triassic, this area was experienced the conversion stage from the end of oceanic suduction to the beginning of collision orogeny.Thus, the discovery of these intrusive rocks has a great significance for the further study on tectonic magmatic beltand the evolution history in Qimantage area, East Kunlun.
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