新疆阿舍勒铜矿酸性火山岩的地球化学特征与构造背景  

Geochemical characteristics and tectonic setting and of acidic volcanic rocks in Ashele copper deposit,Xinjiang

作　　者：高珍权[1,2,3] 赵青[4] 方维萱[1,2] 胡瑞忠[1] 方明[3] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放研究实验室,贵阳550002 [2]有色金属矿产地质调查中心,北京100814 [3]昆明理工大学,昆明650093 [4]新疆维吾尔自治区国土资源咨询研究中心,乌鲁木齐830002

出　　处：《矿产勘查》2010年第5期431-440,共10页Mineral Exploration

基　　金：科技部国家重点基础研究发展规划项目(编号:200lCB4O9805);中国科学院地球化学研究所矿床地球化学重点实验室基金(编号200303)联合资助

摘　　要：新疆阿舍勒铜矿床中玄武岩—英安岩—流纹岩岩石组合属钙碱性(亚碱性)系列。流纹岩类和英安岩类岩石均属过铝质、低—中钾系列火山岩。酸性火山岩微量元素含量及比值特征、大离子半径及稀土元素配分模式、微量元素构造环境判别图的投点结果,显示本区酸性火山岩与玄武岩具有同源区特点,均起源于富集地幔,属于玄武岩浆经岩浆结晶分异作用的产物,它们形成的构造背景为洋内弧附近的前弧盆地。Rock associations of basalt, dacite and rhyolite in Ashle copper deposit in Xinjiang, China, are attached to calc - （sub - ） alkaline volcanic rock series. Rhyolites and dacites have the characteristics of peraluminous, medium to low potassium volcanic rock series. Based on the features of the contents of trace elements and their ratios, the large - ionic radius element and REE pattern and the spider plots of trace elements, and the results of discrimination diagrams, it can be inferred that acidic volcanic rocks of Ashele would possibly produced in the background of fore - arc basin nearby the intra - oceanic arc. Magmatic sources of acidic and basic volcanic rocks in the study area,resulting from magmatic differentiation, may origin form the same magmatic source（ the enriched mantle）.

关 键 词：阿舍勒铜矿床 酸性火山岩 富集地幔 洋内弧 前弧盆地 

分 类 号：P591[天文地球—地球化学] P613[天文地球—地质学]