Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 759-771.doi: 10.13278/j.cnki.jjuese.201503110

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Geochemical Characteristics of Ore-Forming Fluids and Genesis of Dongshanwan Tungsten- Molybdenum Polymetallic Deposit in Inner Mongolia

Wang Chengyang1, Wang Keyong1, Zhou Xiangbin2, Li Wen3, Huang Guanghuan3, Li Jianfeng1, Zhang Xuebing1, Yu Qi1   

  1. 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
    2. Institute of Geological Science of Heilongjing Province, Harbin 150036, China;
    3. Inner Mongolia Shandong Gold Minerals Survey Co., Ltd, Chifeng 024005, Inner Mongolia, China
  • Received:2014-11-13 Published:2015-05-26

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Abstract:

Dongshanwan W-Mo poly-metallic deposit is a newly discovered porphyry type deposit in the southern Great Xing'an Range.It occurs in the contact zone of the Late Yanshanian granitoids and Permian strata. It mainly develops as vein-let type and fine vein disseminated type in terms of mineralization. The formation of Dongshanwan deposit can be divided into three stages: I. wolframite-arsenopyrite-quartz,Ⅱ. arsenopyrite-molybdenite-quartz, and Ⅲ. silver polymetallic-quartz. For the purpose of getting the origin, nature,and evolution characteristics of the ore-forming fluids of the different mineralization stages, we discuss the petrography, micro-thermometry, and carbon-hydrogen-oxygen isotope of the fluid inclusions. The results show that: the aqueous two-phase and vapor-rich two-phase fluid inclusions developed in stage I and II, their homogenization temperature ranges 232.7-321.7 ℃ and 201.2-352.7 ℃, the salinity values of ranges 3.4%-9.8% and 4.1%-10.4%, and the ore-forming fluid belongs to medium temperature and medium salinity NaCl-H2O hydrothermal system. The aqueous two-phase fluid inclusions developed in stage III, their homogenization temperature ranges from 198.6 to 273.5℃, the salinity values ranges from 5.0%-8.4%, and the ore-forming fluid belongs to low temperature and low salinity NaCl-H2O hydrothermal system. The δ18O value of quartz sample ranges from 7.5‰-9.0‰, the δDH2O-SMOW value and δ13CPDB value of the fluid inclusions in quartz are -175.6‰--160.3‰ and -23.5‰--20.1‰. The ore-forming fluid has the characteristics of hydrothermal magma, which is accompanied by adding of meteoric water and organic matter in the formation, this led to a lower value of δDH2O-SMOW and δ13CPDB value of ore-forming fluid. The immiscibility and adding of meteoric water led to the mineralization of tungsten and tin, and the silver poly-metallic mineralization might be caused mainly by cooling of the ore-forming fluid.

Key words: Dongshanwan W-Mo deposit, ore-forming fluids, geochemical nature, ore genesis, Inner Mongolia

CLC Number: 

  • P618.6

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