| 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：.1985.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[J].Mineral Deposits,4(4):1~13 |
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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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