| 滇-黔-桂微细浸染型金矿床时空分布与成矿流体来源研究 |
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| 引用本文： | 朱赖民,金景福.滇-黔-桂微细浸染型金矿床时空分布与成矿流体来源研究[J].地质科学,1998,33(4):463-474. |
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| 作者姓名： | 朱赖民 金景福 |
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| 作者单位： | 1. 中国科学院地球化学研究所矿床地球化学开放研究室 贵阳 550002;2. 成都理工学院 成都 610059 |
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| 摘 要： | 滇-黔-桂微细浸染型金成矿带处于滇-黔-桂裂谷中。金矿床分布与深大断裂存在依附性。金矿带基本展布于深大断裂限定的三角区内,金矿床则分布于深大断裂旁侧或其交叉部位。由幔源岩浆岩(超基性岩及玄武岩)和幔源矿物沿深大断裂分布可推断,深大断裂延伸较深,可达上地幔,属超壳深大断裂。金矿床分布不受地层层位的限制,金矿化具有多层位成矿性。铅、硫、碳、氢、氧同位素地球化学综合对比研究表明,成矿热液中的矿质、矿化剂和水具深源与浅源的混合特征。热液成矿期矿石中石英及萤石的电子自旋共振(ESR)定年结果为68.40±32.41Ma,表明本区金矿床的成矿可能发生在燕山晚期-喜山早期。
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| 关 键 词： | 微细浸染型金矿床 时空分布 成矿流体 |
| 收稿时间： | 1997-07-29 |
| 修稿时间： | 1997-07-29; |
THE STUDY OF THE TIME SPACE DISTRIBUTION AND SOURCE OF ORE FORMING FLUID FOR THE FINE DISSEMINATED GOLD DEPOSITS IN THE YUNNAN GUIZHOU GUANGXI AREA |
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| Zhu Laimin\ Liu Xianfan.THE STUDY OF THE TIME SPACE DISTRIBUTION AND SOURCE OF ORE FORMING FLUID FOR THE FINE DISSEMINATED GOLD DEPOSITS IN THE YUNNAN GUIZHOU GUANGXI AREA[J].Chinese Journal of Geology,1998,33(4):463-474. |
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| Authors: | Zhu Laimin\ Liu Xianfan |
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| Institution: | 1. Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002;2. Chengdu Institute of Technology, Chengdu, 610059 |
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| Abstract: | The fine-disseminated gold deposits in the trigonal area of Yunnan-Guizhou Guangxi lie in the Yunnan-Guizhou-Guangxi rift.The distribution of the gold deposits clings to deep-big faults.The gold metallogeneti belt is situated largely in the trigonal area which is restricted by the deep-big faults.The gold deposits exist on the sides or the crossover of the deep-big faults.From the distribution of magma rock deprived from the mantle (such as ultrabasic vein and basalt) along the big deep faults,it can be concluded that the deep-big faults might have incised into mantle layer,and they belong to the deep-big faults which overtake the crust.The distribution of the fine-disseminated gold deposits in the trigonal area of Yunnan-Guizhou-Guangxi are not restricted by the strata.The Strata exposed in the region from the Devonian to Triassic systems mostly have gold deposits.The gold deposits have the characteristic of multiple strata layers.The gold deposits in the different strata have the similar metallogentic characteristics and their metallogenic stage is close.The results of research show that the ore-forming material resource exhibits crust-mantle mixing characteristic.The age of electron spin resonance in the quarts and fluorite of the oreforming stage indicates that ore-forming age of the gold deposits focus on 68 40?32.41Ma,and that the gold mineralizatin happened in the late Yanshen period and early Himalayan period.On the basis of the extensive study and analysis,the probable metallogenic mechanism can be epitomized as:in the late Yanshen-early Himalayan period,the extensional stress surrounding the area changed from extrusion to extension,the juvenile fluid with mineral and mineraliser generated by the mantle extension exhausting with the ultrabasic vein intrusion came into the crust.Because of the powerful thermal,chemical and dynamical field of the juvenile fluid,the fluid produced by the mixture of juvenile fluid and formation water and meteoric water could leach the elements into the sedimentary stratum,and become the ascendant metallogenic fluid containing elements and mineraliser,and was deposited in the ore-forming structure nearby the deep-big faults. |
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| Keywords: | Fine disseminated gold deposit Time space distribution Ore forming fluids |
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