| 德兴斑岩铜矿田两类伊利石的存在及其在蚀变分带中的意义 |
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| 引用本文： | 金章东,朱金初,季峻峰,李福春,卢新卫.德兴斑岩铜矿田两类伊利石的存在及其在蚀变分带中的意义[J].高校地质学报,2000,6(1):72-79. |
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| 作者姓名： | 金章东 朱金初 季峻峰 李福春 卢新卫 |
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| 作者单位： | 1. 中国科学院 南京地理与湖泊研究所 江苏 南京 210008；2. 南京大学 内生金属矿床成矿机制研究国家重点实验室 江苏 南京 210093 |
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| 基金项目： | 中国科学院资助项目，49733120;49873026， |
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| 摘 要： | 德兴斑岩铜矿田内存在两种成因类型的伊利石：一是特征的热液蚀变矿物，它是在热液流体 作用过程中斜长石、云母类矿物通过伊利石化过程形成的，其结晶度(IC)和膨胀层含量受携 带矿质的热液流体量控制；二是浅变质作用自身的产物，其结晶度远较小于前者，具2M1 多型，且不含膨胀层，是原始蒙皂石完全伊利石化形成的。作者发现，在斑岩体和接触带内 ，伊利石结晶度小的部位，蚀变程度强，矿化品位也高。
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| 关 键 词： | 伊利石 热液流体 蚀变分带 斑岩铜矿 铜矿床 |
| 收稿时间： | 2000-03-20 |
| 修稿时间： | : |
Contrast between Two Illites of Different Origins and the Distinctive Significance of Illitic Alteration Zones at Dexing Porphyry Copper Ore Field |
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| JIN Zhang-dong,ZHU Jin-chu,JI Jun-feng,LI Fu-chun,LU Xin-wei.Contrast between Two Illites of Different Origins and the Distinctive Significance of Illitic Alteration Zones at Dexing Porphyry Copper Ore Field[J].Geological Journal of China Universities,2000,6(1):72-79. |
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| Authors: | JIN Zhang-dong ZHU Jin-chu JI Jun-feng LI Fu-chun LU Xin-wei |
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| Institution: | 1. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing, 210093; 2. Nanjing Institute of Geography and Limonology, Chinese Academy of Sciences, Nanjing, 210008 China |
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| Abstract: | According to difference in features of illite such as spatial distribution, crystallinity index, contents of swelling layer, 2M 1 polytype and relationship between its index and copper grade, there exist two typical kinds of illite within Tongchang porphyry copper deposit, Dexing County. The one is a kind of altered mineral within the hydrothermal alteration zone. It is developed in the altered granodiorite porphyry and altered metamorphic tuffaceous phyllite near the contact zone with the porphyry rock body. Its crystallinity value and expandability are mainly effected by water/rock ratio or fluid influx. This kind is formed by illitization of plagioclase and micas during the hydrothermal fluid evolution and water rock interaction within the porphyry body and the wall rocks near contact zone. The other kind is a product of low grade metamorphism by illitization of smectite. Its crystallinity index is lower than the former. It is 2M 1 polytyped and without swelling layer, developed in the altered metamorphic tuffaceous phyllite at certain distance from the prophyry rock body (>2km). Moreover, because the illitic crystallinity and the degree of copper mineralization are both controlled by the water/rock ratios, the negative correlation between illite index value and copper grade indicates that within the porphyry body and near the contact zone with wall rocks, the lower the illitic crystallinity value, the stronger the alteration degree, and the higher the copper grade. Consequently, the illitic crystallinity value could be used as an indicator for mineral deposits research, such as for the porphyry copper deposits. |
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| Keywords: | illite hydrothermal fluid low grade metamorphism alteration zone porphyry copper deposit Dexing County Jiangxi Province |
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