| 铜官山铜矿床新类型矿体的发现及矿床成因模式——兼论其与区域铜矿复合模式的关系 |
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| 引用本文： | 杨兵,王之田.铜官山铜矿床新类型矿体的发现及矿床成因模式——兼论其与区域铜矿复合模式的关系[J].矿床地质,1985,4(4):1-13. |
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| 作者姓名： | 杨兵 王之田 |
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| 作者单位： | 中国有色金属总公司矿产地质研究所，中国有色金属总公司矿产地质研究所 |
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| 摘 要： | 铜官山铜矿在开采过程中新发现了有工业意义的石英脉型铜矿体。这一发现和早先在东石门五通石英岩中发现的斑岩型浸染状矿体,打破了本区矿床底板硅质岩中不含矿的传统认识,具有重要的实际和理论意义。上述两种新类型矿体的发现,表明传统上被认为是典型矽卡岩型的铜官山铜矿床的成矿特点与长江中下游区域成矿特点有惊人的相似性。
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The discovery of a new type orebody and the metallogenic model of the Tongguanshan copper deposit with a discussion on its relationship to the complicated regional copper metallogenic model |
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| Abstract: | The discovery of the economic quartz vein type copper orebody, together with the previously discovered porphyry type dissemination orebody, makes the metallogenic characteristics of the Tongguanshan copper deposit, which has been traditionally considered as a typical skarn type deposit, astonishingly similar to complicated regional metallogenic model of copper ores in Middle Lower Yangtze Valley. In all, there exist four types of orebodies in the Tongguanshan copper mine, i. e., sedimentary-reformed type, skarn type, quartz vein type and porphyry type. On the basis of investigations on their geological, geochemical and inclusion characteristics, the following metallogenic model is suggested: In Middle Carboniferous, a copper-bearing pyrite bed deposited in a confined salinized plateform with the ore-forming substances derived from the old lands lying on the south and north. In Yenshanian period, the intermediate to acidic magma intruded, which extracted metallic elements not only from the Precambrian basement but also from the Lower-Middle Carboniferous series and its underlying strata. The Yenshanian intrusion activated, transferred, superposed and re-enriched the metallic elements previously present in the Early to Middle Carboniferous sediments, thus forming the sedimentary-reformed copper orebodies. When the magma encountered the Permian carbonate rocks, the skarn copper orebodies were formed. When the magma intruded into the Devonian silicic strata, the porphyry copper orebodies were formed within the intrusive mass. Where fractures were developed in the silicic country rocks, the post magmatic hydrothermal solutions of the intrusive would give birth to the copper-bearing quartz veins and veinlets. |
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