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现代矿业 ›› 2022, Vol. 38 ›› Issue (08): 45-.

• 地质·测量 • 上一篇    下一篇

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

马方彬1 郗国庆2 任永健2 刘星旺2 于汪2 王朝金2 冯宏业3 柳霞丽1 钱洪夫1
  

  1. 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
  • 出版日期:2022-08-25 发布日期:2023-06-02
  • 基金资助:
    *中国地质调查局全国重要化工矿产调查项目(编号:1212011220827)。

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

MA Fangbin1 XI Guoqing2 REN Yongjian2 LIU Xingwang2 YU Wang2 WANG Chaojin2 FENG Hongye3 LIU Xiali1 QIAN Hongfu1#br#   

  1. 1. General Institute of Chemical Geological Survey,China Chemical Geology and Mine Bureau;2. Geolo⁃ gy Institute of China Chemical Geology and Mine Breau;3. College of Earth and Planetary Sciences,Uni⁃ versity of Chinese Academy of Sciences
  • Online:2022-08-25 Published:2023-06-02

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。

关键词: 碱性花岗岩, 地球化学特征, 岩石成因, 构造意义

Abstract: 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 rel⁃ atively low. Through the petrological and geochemical research of the alkaline rocks in the area,the petro⁃ genesis 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 calci⁃ um 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 charac⁃ teristics of type I granites,which may be formed in the late orogenic-cocollisional tectonic environment.

Key words: alkali granites, geochemical characteristics, petrogenesis, tectonic significance