新疆西南天山克其克果勒地区碱性花岗岩成因及其构造意义  

Genesis and Tectonic Significance of Alkaline Granites in Keqikegol Area,Tianshan Mountain,Southwest Xinjiang

作　　者：马方彬 郗国庆 任永健[2] 刘星旺[2] 于汪 王朝金[2] 冯宏业 柳霞丽 钱洪夫 MA Fangbin;XI Guoqing;REN Yongjian;LIU Xingwang;YU Wang;WANG Chaojin;FENG Hongye;LIU Xiali;QIAN Hongfu(General Institute of Chemical Geological Survey,China Chemical Geology and Mine Bureau;Geolo-gy Institute of China Chemical Geology and Mine Breau;College of Earth and Planetary Sciences,Uni-versity of Chinese Academy of Sciences)

机构地区：[1]中化地质矿山总局化工地质调查总院 [2]中化地质矿山总局地质研究院 [3]中国科学院大学地球与行星科学学院

出　　处：《现代矿业》2022年第8期45-48,共4页Modern Mining

基　　金：中国地质调查局全国重要化工矿产调查项目(编号:1212011220827)。

摘　　要：研究区位于新疆塔里木盆地北缘南天山拜城以北,区内碱性岩研究程度较低。通过对区内碱性岩的岩石学及地球化学研究,探索其岩石成因及构造环境。主微量元素研究表明,碱性岩具富碱,高钾、铝,富集Rb、Th、U、Pb及LREE,低钙、镁,亏损Sr、Ba、Ta、Nb、Zr、Ti、P及强负Eu异常的特征,属准铝质高钾钙碱性—钾玄质花岗岩类,具I型花岗岩的特征,可能形成于造山晚期—同碰撞的构造环境。The study area is located to the north of Baicheng in the South Tianshan Mountains on the northern margin of the Tarim Basin in Xinjiang,and the research degree of alkaline rocks in the area is relatively low.Through the petrological and geochemical research of the alkaline rocks in the area,the petrogenesis and tectonic environment are explored.The study of major and trace elements shows that alkaline rocks are rich in alkali,high in potassium and aluminum,rich in Rb,Th,U,Pb and LREE,low in calcium and magnesium,and depleted in Sr,Ba,Ta,Nb,Zr,Ti,P and strong negative Eu anomalies.They belong to quasi-aluminous high-potassium calc-alkaline-potassium basaltic granites,and have the characteristics of type I granites,which may be formed in the late orogenic-cocollisional tectonic environment.

关 键 词：碱性花岗岩 地球化学特征 岩石成因 构造意义 

分 类 号：P588.121[天文地球—岩石学] P597[天文地球—地质学]