西华山钨矿花岗岩地球化学特征及与钨成矿的关系  

Geochemistry Characteristics of Xihuashan Tungsten Granite and Its Relationship To Tungsten Metallogenesis

作　　者：肖剑[1] 王勇[1] 洪应龙 周玉振 谢明璜 王定生 郭家松 

机构地区：[1]东华理工大学,江西抚州344000 [2]江西西华山钨业有限公司,江西大余341500 [3]江西省有色地质勘查二队,江西赣州341000

出　　处：《东华理工大学学报（自然科学版）》2009年第1期22-31,共10页Journal of East China University of Technology(Natural Science)

基　　金：中国地质调查局全国危机矿山接替资源找矿项目(200636029)

摘　　要：西华山钨矿区花岗岩体由斑状中粒黑云母花岗岩(γ25-1a)和中粒黑云母花岗岩(γ52-2a)组成,两者均具有高硅,高碱,贫钛、铁、镁、钙、磷等特点,均属强过铝质高钾钙碱性岩系。γ52-2a较γ25-1a更为高硅,富碱,贫钛、铁、镁,γ25-1a和γ25-2a的成矿元素W,Sn,Mo,Bi含量分别为相应维氏值的10.2,13.27,2.53,595.67倍和75.18,8.35,4.15,932.22倍,围岩中成矿元素W,Sn,Mo,Bi的含量是南岭地壳沉积岩丰度的6.38,6.89,0.98和1.87倍。γ52-2a和γ52-1a稀土总量平均值分别为284.47×10-6和241.10×10-6,γ25-2a的稀土总量比γ52-1a高,γ52-1a为轻稀土富集型,而γ25-2a为重稀土富集型且具有更强的铕亏损。斑状中粒黑云母花岗岩(γ25-1a)和中粒黑云母花岗岩(γ25-2a)侵入活动均伴随着相应的钨矿成作用,并且第二次钨成矿作用更为强烈。The granite of Xihuashan Tungsten deposit consists of like-porphyritic medium-grained （γ5^2-1a）, the medium-grained biotite granite （ γ5^2-2a） , they are rich in SiO2 and alkali, but low TiO2 biotite granite content, low iron content,low MgO content, and are strongly peraluminous high-K calc-alkaline series. Compared withγ5^2-1a,γ5^2-2a is richer in SiO2 and alkali, lower TiO2 content, iron content, MgO content. Ore-forming element W, Sn, Mo, Bi contents of γ5^2-1a and γ5^2-2a, are respectively 10. 2,13.27,2. 53,595.67 and 75.18,8.35,4. 15,932. 22 times of Vinogradov values. Ore-forming element W, Sn, Mo, Bi contents in wall rock are respectively 6. 38,6. 89,0. 98, 1.87 times of Nanling crust deposit abundance. Compared with γ5^2-1a,γ5^2-2a has higher total REE content, means respectively are 284. 47 × 10^-6 and 241.10 × 10^-6.γ5^2-1a is HREE enrichment patten,γ5^2-2a is LREE enrichment patten and stronger Eu depletion than γ5^2-1a. Intrusive events of like-porphyritic medium-grained biotite granite （γ5^2-1a ）and medium-grained biotite granite（γ5^2-2a） all go with tungsten mineralization, and the second tungsten mineralization is more intense.

关 键 词：钨矿床 花岗岩 地球化学特征 西华山 江西省 

分 类 号：P618.67[天文地球—矿床学]