| 墨江金矿成矿流体的形成演化机制 |
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| 引用本文： | 毕献武,胡瑞忠.墨江金矿成矿流体的形成演化机制[J].地质论评,1997,43(4):381-387. |
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| 作者姓名： | 毕献武 胡瑞忠 |
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| 作者单位： | 中国科学院地球化学研究所 贵阳
(毕献武)，中国科学院地球化学研究所 贵阳(胡瑞忠) |
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| 摘 要： | 笔者利用矿物流体包裹体、稳定同位素、微量元素和稀土元素地球化学等手段，研究了墨江金矿成矿流体的地球化学特征，成矿物质来源和形成演化机制。研究结果表明，墨江金矿为中低温热液金矿床，成矿流体属于中性－弱碱性的钠质溶液，其中的水为大气降和岩浆水混合成因，矿化剂主要来源于深部，金主要来源于海西期超基性岩和志留系金厂组浅变质岩。
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| 关 键 词： | 金矿床 成矿流体 矿化剂 成矿演化机制 |
THE MECHANISM FOR FORMATION AND EVOLUTION OF ORE FLUIDS OF THE MOJIANG GOLD DEPOSIT, YUNNAN |
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| Bi Xianwu and Hu Ruizhong.THE MECHANISM FOR FORMATION AND EVOLUTION OF ORE FLUIDS OF THE MOJIANG GOLD DEPOSIT, YUNNAN[J].Geological Review,1997,43(4):381-387. |
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| Authors: | Bi Xianwu and Hu Ruizhong |
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| Abstract: | Using fluid inclusions and stable isotope trace element and REE geochemical means, the writers studied the geochemical characteristics of ore fluids, source of gold and formation and evolution mechanism of ore fluids of the Mojiang gold deposit. It is concluded that the deposit is a mesothermal-epithermal gold deposit,- the ore fluids belong to intermediate to weakly alkaline sodic solutions; the water in the ore fluids was the mixture of meteoric water and magmatic water; the mineralizer, such as H2S and CO2, were mainly derived from the mantle and that gold was derived from Silurian low-grade metamorphic rocks and Hercynian ultrabasic rocks. The mechanism for the formation of the Mojiang gold deposit in the early Himalayan period is as follows- the mineralizer-rich fluids derived from depth ascended in the early Himalayan and was added to the mineralizer-poor fluids cycling in a shallow fracture system, thus the mineralizer-poor fluids converted to mineralizing fluids, which extracted a lot of gold from surrounding rocks; then the gold in the fluids precipitated at suitable places to form the gold deposits. |
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| Keywords: | Mojiang gold deposit ore fluid mineralizer early Himalayan period |
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