大兴安岭北端晚侏罗世花岗岩类地球化学及其地质和找矿意义

武广,陈衍景,孙丰月,李景春,李之彤,王希今. 大兴安岭北端晚侏罗世花岗岩类地球化学及其地质和找矿意义[J]. 岩石学报, 2008, 24(4).
引用本文: 武广,陈衍景,孙丰月,李景春,李之彤,王希今. 大兴安岭北端晚侏罗世花岗岩类地球化学及其地质和找矿意义[J]. 岩石学报, 2008, 24(4).
Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan mountains and their geological and prospecting implications[J]. Acta Petrologica Sinica, 2008, 24(4).
Citation: Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan mountains and their geological and prospecting implications[J]. Acta Petrologica Sinica, 2008, 24(4).

大兴安岭北端晚侏罗世花岗岩类地球化学及其地质和找矿意义

  • 基金项目:

    国家973计划2006CB403508和2007CB411303课题、国家自然科学基金项目 , 国家科技支撑计划项目2006BAB01A02课题以及科学院百人计划项目的资助

Geochemistry of the Late Jurassic granitoids in the northern end area of Da Hinggan mountains and their geological and prospecting implications

  • 大兴安岭北端的龙沟河、二十一站等岩体形成于晚侏罗世,与斑岩型铜金矿化关系密切.这些岩体的主要岩石类型为石英闪长岩、石英二长闪长岩、花岗闪长岩,总体属高钾钙碱性系列,少量属橄榄玄粗岩系列.其SiO2含量介于61.37%~66.59%,Al2O3含量为15.35%~17.06%,MgO含量介于2.02%~3.47%,Mg#指数高达44~59.(La/Yb)N介于16.85~81.73之间,δEu介于0.68~0.93,给出强分异的稀土元素配分型式,与埃达克岩的特征一致.Ba、Sr和LREE强烈富集,Nb和Ta强亏损,Rb和Ti弱亏损;岩石Yb含量介于0.31~1.32μg/g,Y含量介于4.32~12.07μg/g,贫Yb低Y特征显著;Sr/Y介于67.74~220.60,高Sr低Y特征清楚.上述特征也与埃达克岩地球化学特征一致.由于古亚洲洋和蒙古-鄂霍茨克洋分别于古生代末期和二叠纪-中侏罗世闭合,因此,所研究的埃达克岩应形成于中朝-蒙古大陆与西伯利亚大陆之间的陆陆碰撞造山环境,是碰撞造山带加厚下地壳拆沉-熔融的产物.
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