Sphalerite Chemistry,Niujiaotang Cd—Rich Zinc Deposit,Guizhou,Southwest China |
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摘 要: |
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关 键 词: | 富镉锌矿床 闪锌矿 成矿作用 贵州 富集 |
收稿时间: | 16 September 2010 |
Sphalerite chemistry, Niujiaotang Cd-rich zinc deposit, Guizhou, southwest China |
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Authors: | Ye Lin Liu Tiegeng |
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Institution: | (1) Open Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang |
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Abstract: | Sphalerite in the Niujiaotang Cd-rich zinc deposit, Duyun, Guizhou is characteristically light-yellow in color with significant
enrichment of cadmium which ranges from 0.83% to 1.97% (averaging 1.38%) in concentration in the mineral, corresponding to
an enrichment coefficient as high as 30. 47 to 72. 96. In comparison with other major Pb−Zn deposits in the world (the Mississippi
Valley deposits, and the Fankou and Jinding deposits in China) the Niujiaotang deposit isn
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n×10 times richer in cadmium. Sphalerite in the deposit is also rich in Ga and Ge, but poor in In, Mn and Fe, suggesting some
special mechanisms that govern the geochemical behavior of these trace elements. Except for a minor amount of independent
minerals like greenockite, cadmium occurs mainly as isomorphous impurity in the crystal lattice of sphalerite. During weathering
and leaching under supergene condition, cadmium was separated from Zn, resulting in some secondary minerals of Cd, including
oxides and otavite.
This project was jointly supported by the National Natural Science Foundation of China (No. 496-33110) and the Laboratory
Foundation of Ore Deposit Geochemistry of Chinese Academy of Sciences. |
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Keywords: | Niujiaotang Cd-rich zinc deposit sphalerite Cd |
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