The characteristics and significance of pure nitrogen fluid inclusions in Xikuangshan copper deposit, Dongchuan, Yunnan of China |
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| Authors: | Lin Ye Yuping Liu Yulong Yang Wei Gao |
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| Institution: | 1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
2. Graduate University of Chinese Academy of Sciences, Beijing, 100049, China
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| Abstract: | Nitrogen is an important gas-phase element in geological fluid, and normally hosted in mineralizing fluid, in which the content
is very low. Nearly 100% mol pure nitrogen inclusion was discovered in copper-bearing quartz vein from Xikuangshan copper
deposit, Dongchuan, Yunnan Province in this research. It is between 3 and 5 μm, in shape of ellipse, occurring in group or
independence without obvious orientation, and co-existed with primary gas-liquid inclusions. Inclusion analysis by using laser
Raman spectroscopy shows its composition is dominated by nitrogen with minor H2O. High concentration of N2 may be the necessary and sufficient condition for forming this kind of inclusion. It is suggested that there are two genesis
modes of pure N2 inclusion in the deposit, oxidation-devolativation of mantle matter and trap of metasomatic fluid in organic matter decomposition
in Luoxue Formation dolomite. In conclusion, pure N2 inclusion hardly presents in the ore-forming fluids, which providing a new evidence for the genesis of Xikuangshan type copper
deposit. |
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| Keywords: | nitrogen fluid inclusion oxidation dehydration organic matter decomposition Laser Raman spectroscopy copper deposit Xikuangshan |
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