赣南樟东坑钨矿成矿花岗岩及矿化特征
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...
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| Published in | 地质与勘探 Vol. 48; no. 4; pp. 685 - 692 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
2012
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| Subjects | |
| Online Access | Get full text |
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| Summary: | 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。 |
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| Bibliography: | 11-2043/P 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 l |
| ISSN: | 0495-5331 |