大兴安岭北端阿乌尼地区中生代杂岩体的岩浆混合作用  

Magma mixing of the Mesozoic hybrid in the Awuni area at the northern end of the Da Hinggan Mountains,China.

作　　者：赵海滨[1] 莫宣学[1] 任院生[2] 韩振哲 尹志刚[1] 李尚林[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]河北省国土资源咨询研究中心,河北石家庄050031 [3]黑龙江省地质调查研究总院齐齐哈尔分院,黑龙江齐齐哈尔161005

出　　处：《地质通报》2005年第9期854-861,共8页Geological Bulletin of China

基　　金：中国地质调查局1:25万区域地质调查项目(编号:0199115050)资助

摘　　要：通过外野地质特征、岩相学、岩石地球化学等方面的研究,从不同的角度论证了大兴安岭阿乌尼地区出露的岩浆杂岩体在成因上具有岩浆混合作用的特点。同位素上具低的Sr初始比值和正的εN(dt)值,明显具有幔源特点,而微量元素相对富集大离子亲石元素和高场强元素又具有壳源特征,表明阿乌尼地区的岩浆岩可能是壳幔相互作用的产物。On the basis of studies of the field geological characteristics, petrography and geochemistry, the authors demonstrate from different aspects that the magmatic hybrid exposed in the Awuni area, Da Hinggan Mountains, has features of magma mixing in terms of the magmatic origin. Isotope study shows that the hybrid is characterized by low initial Sr ratios and positive εNd（t） values, showing obvious mande-derived features. On the other hand, the fact that trace elements are enriched as compared with large-ion lithophile elements and high field strength elements shows crustal-derived features, suggesting that magmatic rocks in the Awuni area might be the product of crust-mande interaction.

关 键 词：大兴安岭 岩浆混合 壳幔作用 陆壳增生 

分 类 号：P588.121[天文地球—岩石学] P588.12[天文地球—地质学]