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LI Wei, JIANG Bin, LIU Miao, CHEN Jingsheng, LI Bin, YANG Fan, ZHANG Yujin, LIU Shifeng, CAI Nao. 2020. A study of the fluid inclusions and chronology of the Shanwanzi gold deposit in Chifeng, Inner Mongolia[J]. Geology in China, 47(2): 394-405. doi: 10.12029/gc20200209
Citation: LI Wei, JIANG Bin, LIU Miao, CHEN Jingsheng, LI Bin, YANG Fan, ZHANG Yujin, LIU Shifeng, CAI Nao. 2020. A study of the fluid inclusions and chronology of the Shanwanzi gold deposit in Chifeng, Inner Mongolia[J]. Geology in China, 47(2): 394-405. doi: 10.12029/gc20200209
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A study of the fluid inclusions and chronology of the Shanwanzi gold deposit in Chifeng, Inner Mongolia

  • 1.

    Shenyang Center of China Geological Survey, Shenyang 110034, Liaoning, China

  • 2.

    College of Earth Science, Jilin University, Changchun 130061, Jilin, China

  • 3.

    Liaoning Technical University, Fuxin 123000, Liaoning, China

  • 4.

    Stony Brook University, Stony Brook, NY 11794, USA

    • Fund Project: Supported by China Geological Survey Program (No. DD20190039-06, No. DD20160048-04)
More Information
  • Author Bio: LI Wei, male, born in 1976, senior engineer, mainly engages in regional geology and mineral survey; E−mail:57907017@qq.com
  • Corresponding author: JIANG Bin, male, born in 1979, senior engineer, mainly engages in regional geology and mineral survey; E−mail: 310941224@qq.com 
Received Date:  22 June 2018
Revised Date:  26 October 2019
Publish Date:  25 April 2020
    Abstract

  • The Shanwanzi gold deposit in Chifeng of Inner Mongolia which is located in the east of Chifeng-Chaoyang gold metallogenic belt occurs in the andesite of the early Cretaceous Yixian Formation. In order to discuss the metallogenic age and genetic characteristics of the deposit, the authors, through the study of petrography, microthermometry, hydrogen, oxygen isotope and chronology of the the fluid inclusions, have reached the following conclusions:The fluid inclusions are mainly composed of pure liquid inclusions and a small amount of gas-liquid two-phase inclusions, and the gas composition of the inclusions is mainly H2O and CO2, which reflects the NaCl-H2O-CO2 system; uniform temperature range is 219-249℃, and salinity is 0.35%-3.23% NaCl eqv., suggesting that the temperature and salinity of the principal metallogenic period is low; the metallogenic pressure is 2.7-33.8MPa, and the metallogenic pressure depth is 2.78 km, indicating that the mineralization exhibits a shallow characteristic; the formation age of andesite determined by ICP-MS U-Pb zircon is 123.6 Ma and 124.5 Ma, which is consistent with the age of early Cretaceous period of the Chaoyang-Chifeng gold metallogenic belt. Combining ore deposit characteristics with the study of the metallogenic fluid, the authors hold that the Shanwanzi gold deposit is a low sulfur, low temperature hypabyssal hydrothermal deposit.

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