黔西北威宁地区香炉山铜矿床地质地球化学特征及成因  

Geological and Geochemical Characteristics and Genesis of the Xianglushan Copper Deposit in the Weining Area,Northwestern Guizhou

作　　者：李松涛[1,2,3] 刘建中[1] 何明友[4] 夏勇[2] 张海[5] 周光红[2] 王泽鹏[1] 谢卓君[2] 韦东田 郭海燕[2] 何珊[2] 黄利平[1] 张兵强[1] 刘松[1] 

机构地区：[1]贵州省地质矿产勘查开发局105地质大队,贵州贵阳550018 [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

出　　处：《地质与勘探》2016年第5期826-837,共12页Geology and Exploration

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

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。The Xianglushan copper deposit of the Weining area,northwestern Guizhou lies in the conjunction between the top of the third section of the Emeishan basalt Formation and the bottom of the Xuanwei Formation. On the basis of analyses of major elements,trace elements,rare earth elements and SEM observations,we have studied the geochemical characteristics and genesis of this deposit. The results show that the basalt belongs to thloiite with high Ti. The provenance graph of the main elements and the trace element analysis show that the sources of diagenetic and ore- forming materials were closely related to the Emeishan basalt,meanwhile affected by crustal material. The REE distribution patterns are of a rightward deviation characterized rich LREE and deplete of HREE. Negative anomalies of Eu and log（ δCe） 〉-0.1 suggest a reduction setting of mineralization. α ＋ β- Zn- Cu alloy minerals were revealed with SEM,of which chemical molecular formula is Cu0. 78Zn0. 47Fe0. 06. Combined with the regional geological background and the geological characteristics of the deposit,it is concluded that the genesis of this copper deposit is not only related to the volcanism and sedimentary diagenesis but also related to the late hydrothermal fluid activity.

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 

分 类 号：P618[天文地球—矿床学]