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黔西北威宁地区香炉山铜矿床赋存于峨眉山玄武岩组第三段(P3β3)顶部与宣威组(P3X)底部间的结合部位。本文采用主量元素、微量元素、稀土元素和扫描电镜分析方法对其地质地球化学特征进行了研究,并探讨了矿床成因。结果表明:区内玄武岩属高钛的拉斑玄武岩,主量元素物源区特征图和微量元素分析结果表明其成岩、成矿物质来源与峨眉山玄武岩密切相关,同时又受到地壳物质的影响;稀土元素表现出轻稀土富集、重稀土亏损的右倾分配模式,Eu负异常以及log(δCe)>-0.1表明矿床形成于还原环境;扫描电镜分析发现了α+β-Zn-Cu合金矿物,化学分子式为Cu0.78Zn0.47Fe0.06。结合区域地质背景和矿床地质特征,认为该铜矿床的形成不仅与火山作用和沉积成岩作用有关,而且还受到后期热液活动的影响。
The Xianglushan copper deposit in the Weining area in northwestern Guizhou Province occurs at the junction between the top of P3β3 and the bottom of Xuanwei Formation (P3X) in the Emeishan basalt group. In this paper, the main elements, trace elements, rare earth elements and scanning electron microscopy analysis of its geological and geochemical characteristics of the study and discussed the cause of the deposit. The results show that basalts in the area are thylakoid basalts with high contents of titanium. The characteristics of source and source elements of major elements and trace elements analysis indicate that their source rocks are closely related to Emeishan basalts and are affected by crustal materials. The elements show the enrichment of light rare earths, the rightward distribution pattern of heavy rare earth losses, Eu anomalies and log (δCe)> -0.1 indicate that the deposit is formed in the reducing environment. The SEM analysis shows that the α + β-Zn-Cu alloy, Molecular formula is Cu0.78Zn0.47Fe0.06. Combined with the regional geological background and the geological characteristics of the deposit, it is considered that the copper deposit is not only related to volcanism and sedimentary diagenesis, but also affected by hydrothermal activity in the later period.