Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (1): 87-104.doi: 10.13278/j.cnki.jjuese.20160224

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Fluid Inclusions and S-Pb Isotopes in Zaozigou Gold Deposit, Hezuo in Gansu Province

Chen Ruili1, Chen Zhengle1,2, Wu Junjie1, Liang Zhilu3, Han Fengbin2, Wang Yong2, Xiao Changhao2, Wei Liangxi4, Shen Tao1   

  1. 1. School of Earth Sciences, East China University of Technology, Nanchang 330013, China;
    2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;
    3. Third Institute Geological and Mineral Exploration of Gansu Province Bureau of Geology and Mineral Resources, Lanzhou 730050, China;
    4. Graduate School of China University of Geosciences, Beijing 100037, China
  • Received:2017-02-23 Online:2018-01-26 Published:2018-01-26
  • Supported by:
    Supported by Key Program of National Natural Science Foundation of China (U1403292) and Project of China Geological Survey (1212011220936,12120114032401)

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Abstract: The Zaozigou gold deposit is located at the west part of the Western Qinling Mountain range. It is one of the recently discovered large-scale gold deposits. The ore bodies are hosted in the Triassic Gulangti sedimentary rocks, and have a close relationship with the medium-acid dykes. The ore bodies and Indo-Sinian granitic veins are tightly controlled by faults; where the metal sulfides are stibnite, pyrite and arsenopyrite et al. Microscope observations showed that there are two-phase isolated primary inclusions in the gold-bearing quartz veins. Homogenization temperature falls in 129.8-324.3℃ with 203.2℃ as the average. The salinity w(NaCl) is 1.22%-10.73% with 6.04% as the average, indicating that the average density of ore-forming solution was 0.90 g/cm3, and the average depth was 2.00 km. The analyses of the fluid inclusion composition showed that the composition of gaseous phase is a NaCl-H2O-CO2 system, and the main fluid phase composition is a Na+-SO42--Cl- system. The Laser Raman spectroscopy revealed that the main composition in single inclusion are H2O,CO2 and SO2, only a few with CH4 and CO, suggesting that the ore-forming fluid in the Zaozigou deposit is a fluid of magmatic water mixed with ground water formed under low temperature, low salinity, and low density. The studies indicate that the mineralization has intimate relationship with two different proper fluid boiling and fluid mixing. The composition of the sulfur isotope is relatively stable, and the value of δ34SV-CDT changes from -10.30‰ to -8.10‰ with the average value of -9.33‰, suggesting that the sulfur was mainly derived from the deep seated magma and a little from sedimentary strata. The lead isotopic ratios of ore samples are 206Pb/204Pb 18.166-19.027, 207Pb/204Pb 15.608-15.741, 208Pb/204Pb 38.249-39.275, indicating the crust and mantle mixing lead. The characteristics of the deposit, the nature and resource of ore-forming fluids and material suggest that the Zaozigou gold deposit is a kind of epithermal deposit related with magmatism.

Key words: fluid inclusions, S-Pb isotope, Zaozigou gold deposit

CLC Number: 

  • P611.11
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