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| Characteristics of Chlorite from the Tongkuangyu Copper Deposit in Shanxi Province and Their Geological Implications |
| SUN Jun-gang1,2, LI Hong-ying2, LIU Xiao-huang3, XIE Kun-qi1, CHEN Wei2, XUE Sheng-sheng4, SUN Xing-li5 |
1. The 7th Gold Department of Chinese People's Armed Police Force, Yantai Shandong 264000, China;
2. MRL Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;
3. Gold Command of Chinese People's Armed Police Force, Beijing 100023, China;
4. Institute of Geophysical and Chemistry Exploration in Shanxi Province, Yuncheng Shanxi 044004, China;
5. Shijiazhuang University of Economics, Shijiazhuang 050031, China |
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Abstract In order to discuss petrogenic and ore-forming significances of chlorite of the Tongkuangyu porphyry copper deposit in Shanxi Province, compositions of the chlorite has been analyzed by using electron microprobe in this paper. Four types of the chlorite in the deposit have been observed. They include chlorite occurred in(with)quartz-sulfide veins(Type Ⅰ), chlorite occurred in(with)calcite-sulfide veins(Type Ⅱ), chlorite occurred in(with)porphyry(Type Ⅲ), and chlorite occurred in altered wall rocks(Type Ⅳ). They are mainly prochlorite and pycnochlorite of the Fe-rich chlorite. This indicates that they could be formed in a partial reducing environment. The phenomenon that Mg ions were mainly substituted by Fe ions in the lattice of chlorite suggests that the formation of those chlorites is closely associated with the mafic wallrocks under several metamorphisms. According to the chlorite geothermometer, these chlorites were formed in a range of low-moderate temperatures varying from 180℃ to 220℃. It is believed that the hydrothermal fluid was gradually evolved to more acidity with the continuous decrease of temperature in the mineralization process of the deposit.
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Received: 09 December 2014
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