| 光谱学与光谱分析 |
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| Feieling Skarn-Type Pb-Zn Deposit in Southwest Margin of Yunkai Massif |
| ZENG Chang-yu1, 4, ZHAO Ming-zhen2, LI Hong-zhong3, 4*, NIU Jia1, 4, ZHANG Jie-tang1, 4, HE Jun-guo1, 4*, ZHOU Yong-zhang1, 4, YANG Zhi-jun1, 4 |
1. School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510641, China
2. School of Material Science and Engineering, South China University of Technology, Guangzhou 510275, China
3. Key Laboratory of Mineral Resource, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4. Guangdong Provincial Key Lab of Geological Proceses and Mineral Resource Survey, Guangzhou 510275, China |
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Abstract The Feieling Pb-Zn deposit of skarn-type is located the in Southwest margin of Yunkai massif, China. This ore deposit can be divided into wall rock near ore, concealed rock mass, endoskarn, exoskarn and orebody. The Raman and FTIR spectrum are conducted to study the mineralogical characteristics of quartz and calcite from five types of rocks from Feieling skarn-type deposit. The analysis shows that the quartz included in the near ore wall rock, endoskarn and exoskarn, comparing with recrystallized quartz of concealed rock mass, has a tend to change into low symmetry quartz in varying degrees. The crystalinity and order degree of quartz from near ore wall rock to concealed rock mass and to endoskarn are becoming higher, but that of quartz from different exoskarn samples display no regular. The origin or the quartz microstructure changes may be related to the multi-stage evolution of skarn mineralization process. The quartz, included in near ore wall rock, endoskarn and exoskarn, become easier to recrystallize and adjust microstructure under the influence of the multi-stage hydrothermal and temperature effect. In anyone sample, the earlier crystalline calcite, showing subhedral-euhedral crystal, display higher crystalinity and order degree. On the contrary, the later crystalline calcite, showing xenomorphic crystal, display lower crystalinity and order degree. Calcite crystal of exoskarn rock contains some silica impurity, while endoskarn and orebody rock is pure. The purity of calcite crystal may relate to Multi-stage evolution of skarn mineralization process. At the early and late skarn stage, active silica-containing fluid is easier to join into calcite, which is under higher temperature environments. On the contrary, at the late quartz-surfide stage, the later crystalized calcite displays higher purity, which is under lower temperature environments. Therefore, spectral characteristics of quartz and calcite reflect multi-stage evolution of skarn mineralization process.
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Received: 2014-07-22
Accepted: 2014-10-15
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Corresponding Authors:
LI Hong-zhong, HE Jun-guo
E-mail: lihongzhong01@aliyun.com; eeshig@mail.sysu.edu.cn
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