张博文;展新忠;端木常青;

• 1:新疆大学地质与矿业工程学院

摘要(Abstract)：

侵位于东准噶尔卡拉麦里构造带内的卡姆斯特岩体是该花岗岩带内最西侧的小型岩体,岩石类型为中粒黑云母花岗岩和细粒花岗岩,为同源岩浆演化的不同产物.该岩体主量、微量及稀土元素地球化学特征表明,其富集SiO_2、K_2O+Na_2O,强烈亏损Ba、Sr、Ti、P,轻重稀土分异不明显,具强烈的负Eu异常,Rb/Sr、K/Rb比值明显偏低,暗示岩浆强烈的分异演化作用,Fe_2O_3/FeO为0.11～1.23,FeO~*为0.86～1.39,显示岩体中度还原环境,与锡成矿作用关系密切.岩石地球化学特征指示其为高硅富碱弱过铝质的A_2型花岗岩.结合区域构造背景,指示其形成于卡拉麦里造山带晚石炭世后碰撞造山阶段的伸展拉张环境.

关键词(KeyWords)： 东准噶尔;卡姆斯特岩体;A型花岗岩;后碰撞

Abstract:

Keywords:

基金项目(Foundation): 新疆大学博士科研启动基金(201604371083)

作者(Author): 张博文;展新忠;端木常青;

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