Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (3): 768-780.doi: 10.13278/j.cnki.jjuese.20190121

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Origin, Evolution of Ore-Forming Fluids and Metallogenic Mechanism of Nianzigou Molybdenum Deposit, Inner Mongolia

Sun Fengyue1, Wang Rui1, Wang Yicun2, Li Shunda3, Wang Keyong1, Shi Kaituo1, Sun Qingfei1, Wang Wenyuan1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. College of Resources, Hebei Geoscience University, Shijiazhuang 050000, China;
    3. College of Geology and Mining Engineering, Xinjiang University, Urumqi 830000, China
  • Received:2019-06-15 Published:2020-05-29
  • Supported by:
    Supported by National Key R&D Program of China(2017YFC0601304)

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Abstract: Nianzigou molybdenum deposit is located in the western part of the Xilamulun molybdenum metallogenic belt at the north margin of North China Craton, which is a medium-sized typical quartz vein type deposit. The ore veins mainly occur in the NNW, NW trending faults developed in the monzonitic granite-moyite intrusions of Early Yanshanian. The hydrothermal mineralization can be divided into four stages:pyrite ±molybdenite+quartz(Ⅰ), molybdenite+pyrite ±chalcapyrite+quartz (Ⅱ), chalcopyrite+pyrite ±sphalerite+quartz (Ⅲ), and quartz ±calcite (Ⅳ). The systematic study on petrography of fluid inclusions, fluid inclusion assemblages,and micro-thermometry shows that the primary ore forming fluids are of high temperature (490-550℃),low-medium salinity NaCl-H2O type solutions (10%-18%); their δ18OH2O-SMOW(2.21‰)and δDH2O-SMOW(-68.9‰)imply that they were originally from magmatic activities, and continuously up-rose and gathered into ore-controlling faults; later with the gradual decrease of temperature and pressure(380-460℃, 26-40 MPa→360-420℃, 25-30 MPa), the state of immiscible two-phase appeared, and the fluid began to boil, which resulted in the deposition of large amounts of Mo; at the late stage of the fluid evolution, the residual solution mixed with meteoric water. Nianzigou Mo deposit is a medium-high temperature magmatic hydro thermal deposit in Early Yanshanian.

Key words: Nianzi gou molybdenum deposit, quartz vein type, fluid inclusion, evolution of ore-forming fluids, Inner Mongolia Autonomous Region

CLC Number: 

  • P618.65
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