黔西北威宁地区香炉山铜矿床地质地球化学特征及成因

发布时间：2018-01-30 08:55

本文关键词： 香炉山铜矿床峨眉山玄武岩地球化学特征黔西北威宁地区　出处：《地质与勘探》2016年05期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:The Xiangzushan copper deposit in Weining area, northwest Guizhou Province, is located between the top of the third member of the Emeishan basalt formation and the bottom of the Xuanwei formation P3X.The main elements and trace elements are used in this paper. The geological and geochemical characteristics of the basalts are studied by means of REE and SEM, and the genesis of the deposits is discussed. The results show that the basalts in the area belong to tholeiite with high titanium content. The characteristic map of the source region of major elements and the analysis of trace elements show that its diagenetic and ore-forming sources are closely related to the Emeishan basalt and are also affected by the crustal material. The rare earth elements show light rare earth enrichment, the negative EU anomaly in the right-dip distribution model of heavy rare earth depletion and log( 未 Ce)-0.1) indicate that the deposit was formed in a reductive environment. The 伪尾 -Zn-Cu alloy mineral was found by SEM analysis, and the chemical formula is Cu0.78Zn0.47Fe0.06. combined with the regional geological background and the geological characteristics of the deposit. It is considered that the formation of the copper deposit is not only related to volcanism and sedimentary diagenesis, but also affected by late hydrothermal activity.
【作者单位】：贵州省地质矿产勘查开发局105地质大队;中国科学院地球化学研究所矿床地球化学国家重点实验室;中国科学院大学;成都理工大学;贵州省地质矿产勘查开发局113地质大队;
【基金】：中国地质调查局《贵州乌蒙山区优势矿产综合调查评价》[12120113052700];中国地质调查局《贵州贞丰-普安金矿整装勘查区关键基础地质研究》[科(2014)04-025-053];中国地质调查局《黔西南矿集区找矿预测》[科(2015)02-09-02-028]联合资助
【分类号】：P618.41
【正文快照】： 2.中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002;3.中国科学院大学,北京100049;4.成都理工大学,四川成都610059;5.贵州省地质矿产勘查开发局113地质大队,贵州六盘水553001)Li Song-tao,Liu Jian-zhong,He Ming-you,Xia Yong,Zhang Hai,Zhou Guang-hong

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