Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (2): 400-413.doi: 10.13278/j.cnki.jjuese.20170339

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C, O, Sr Isotope and REE Geochemistry of Maozu Pb-Zn Deposit in Northeastern Yunnan Mineral Concentration Area

Wu Yongtao, Han Runsheng   

  1. Southwest Geological Survey, Geological Survey Center for Nonferrous Metals Resource, Kunming University of Science and Technology, Kunming 650093, China
  • Received:2018-01-05 Online:2019-03-26 Published:2019-03-28
  • Supported by:
    Supported by National Natural Science Foundation of China (U1133602,40863002,41572060), Project of Key Laboratory of Mineral Resources Prediction and Evalution of Yunnan Province (2010) and Project of Innovation of Kunming University of Science and Technology (2008)

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Abstract: The Maozu Pb-Zn deposit is a large deposit located in the northeastern Yunnan metallogenic province at the southwestern margin of the Yangtze plate. The ore-bodies are stratified and hosted in dolostone of Sinian Dengying Formation. The ore minerals are primarily sphalerite and galena,and the gangue minerals are mainly dolomite,calcite and fluorite. The C, O, Sr isotopes and REE geochemistry of the massive hydrothermal dolomite, calcite, fluorite and surrounding rocks were analyzed. The results show that the chondrite-normalized curves, δ13C and 87Sr/86Sr values of the massive hydrothermal dolomite and calcite are similar to those of the Sinian dolostone, indicating that C, O and Sr were mainly derived from the dissolution of the host rock. The massive hydrothermal dolomite and calcite have higher ∑REE than those of the surrounding rocks, implying that some other fluid with much higher ∑REE joined the ore-forming fluid. Fluorite is characterized by LREE depletion, and the chondrite-normalized curve is quite consistent, indicating that fluorite was formed at a later stage with more other fluid joined. The massive hydrothermal dolomite, calcite and fluorite show that positive Eu anomalies, and the δ18O values of the massive hydrothermal dolomite and calcite are lower than those of the host rock of the Sinian dolostone, indicating that these three gangue minerals might have been formed by high temperature fluid. The Sinian dolostone and the three kinds of gangue minerals show obvious negative Ce anomalies, implying that the ore-forming fluid might mainly come from Sinian Dengying Formation,which inherited the characteristics of the surrounding Sinian rocks. The 87Sr/86Sr ratios of calcite and fluorite are higher than those of the Permian Emeishan basalt and surrounding rocks of Sinian dolostone, but lower than those of the Proterozoic basement rocks (Kunyang and Huili Group). So, it is likely that the ore-forming fluid might mainly come from the surrounding rocks of Sinian Dengying Formation and other strata, and then mixed with the fluid that derived from or flowed through the Proterozoic basement rocks.

Key words: Maozu Pb-Zn deposit, C, O and Sr isotope, ore-forming fluid, geochemistry, northeastern Yunnan metallogenic province

CLC Number: 

  • P618.4
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