赣南樟东坑钨矿成矿花岗岩及矿化特征  

Characteristics of Ore-forming Granite and Its Mineralization in the Zhangdongkeng Tungsten Deposit of Southern Jiangxi Province

作　　者：黄小娥 李光来 郭家松[1] 张敏 胡志国 华仁民 韦星林[1] 

机构地区：[1]江西有色地质勘查局,江西南昌330001 [2]南京大学,江苏南京210093 [3]东华理工大学,江西抚州344000

出　　处：《地质与勘探》2012年第4期685-692,共8页Geology and Exploration

基　　金：国家重点基础研究发展计划(2007CB411404);国家自然科学基金项目(41073035)资助的成果

摘　　要：樟东坑钨矿为崇-余-犹地区典型的花岗岩外接触带石英脉型钨钼矿床之一,矿区隐伏花岗岩分主体与"火焰状"脉体两种岩相产出,都与钨钼矿化有关,为成矿母岩。矿区花岗岩岩石化学总体特征:富硅、铝,贫铁、镁,钙中等,高碱、富钾,分异指数DI较高,ACNK值以>1为主,为酸性-超酸性、分异程度较高的钙碱性-碱性岩系,准铝质-过铝质壳源岩石重熔改造型花岗岩;其地球化学特征:微量元素富Rb、Th、U、K、Ta、Y等低场强元素,而贫Ba、Nb、Sr、P、Ti等高场强元素,稀土元素总量较低、略富轻稀土,Eu严重亏损,稀土配分曲线呈"海鸥型",进一步显现壳型花岗岩特征,且岩浆演化程度较高。矿区钨钼矿化分为石英脉型和岩体型两类,受花岗岩侵入与分异演化控制,具有"上钨下钼"、"上脉下体"的矿化特征。樟东坑火焰状蚀变细粒花岗岩脉型钨钼矿化为赣南崇-余-犹脉钨矿区近年发现的新矿化类型,在赣南具有较大的找矿前景。The Zhangdongkeng tungsten deposit is a typical quartz vein type tungsten-molybdenum deposit hosted outside the granitic contact zone in the Chongyi-Dayu-Shangyou area.The concealed granites in the mine are dominated by two lithofacies,the main granitic body and the flamboyance vein body.Both of them are ore-forming mother rocks with osculation related to the tungsten-molybdenum mineralization.The granites in the mine district are rich in silicon and aluminum,but poor in iron and magnesium,middling in calcium;more alkali and rich in kalium.The DI index is relatively high,and the ACNK value is more than one.They belong to acidic to utra-acidic and alkalescence to calcium alkalescence rock series,with a high degree of differentiation,near to exceed aluminous,i.e.a kind of remelting-reforming granite type from crust rock.And their geochemical characteristics are rich in Rb,Th,U,K,Ta,and Y trace elements but poor in Ba,Nb,Sr,P,and Ti.The total amount of rare-earth elements is low but relatively rich in light rare-earth ones,and severely depleted in Eu with a ＂seagull type＂ of rare-earth element distribution curve.All these indicate further that they are crust type of granites with a high degree of magma evolution.The tungsten-molybdenum mineralization in the mine district is divided into two kinds of type：one is quartz-vine and the other is rock-body,both of them being of mineralizing characters of ＂upper tungsten-lower molybdenum＂ and ＂upper vein-lower body＂,controlled by intrusion and differential evolution of the granite.The flamboyance granule granitic vein type of tungsten-molybdenum mineralization in Zhangdongkeng is a newly discovered type of mineralization in the vein tungsten mine districts of Chong-Yu-You,southern Jiangxi in recent years,with a good ore-search prospect.

关 键 词：“上脉下体” “上钨下钼” 花岗岩演化 岩体型矿化 樟东坑钨矿 赣南 

分 类 号：P628.1[天文地球—地质矿产勘探]