张树栋;龙舟;张明洋;来林;洪文武;周长红;张学斌;

• 1:天津市地质调查研究院
• 2:天津华北地质勘查总院

摘要(Abstract)：

对额仁淖尔地区包饶勒敖包石英闪长岩体进行了LA-ICP-MS锆石U-Pb测年,其锆石LA-ICP-MS U-Pb年龄为(302.5±1.1)Ma(MSWD=0.28),指示岩体成岩时代为晚石炭世末期,属华力西期。岩石地球化学分析表明,该地区石英闪长岩具低TiO_2和高Al_2O_3特征,岩石的Mg~#为0.46~0.50,铝饱和指数A/CNK为0.77~0.90,里特曼指数σ值介于1.54~2.53,显示了偏铝质中-高钾钙碱性系列。稀土元素丰度中等,呈LREE富集HREE亏损的右倾模式,Eu异常不明显或呈弱的负异常,富集Rb、Ba、K等大离子亲石元素,亏损Nb、Ta、P、Ti等高场强元素,具岛弧岩浆岩的特征,暗示晚石炭世末包饶勒敖包地区存在洋壳俯冲-消减事件。区域对比表明,该套岛弧性质的岩石组成属于西乌旗-苏左旗岩浆弧的一部分,为进一步研究锡林浩特-苏左旗缝合带于晚石炭世向索伦一线对接演化提供了新的证据。

关键词(KeyWords)： 包饶勒敖包石英闪长岩;锆石U-Pb定年;俯冲-消减;西乌旗-苏左旗弧岩浆;晚石炭世;额仁淖尔地区

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质大调查项目(12120114064001)

作者(Author): 张树栋;龙舟;张明洋;来林;洪文武;周长红;张学斌;

Email:

DOI: 10.19509/j.cnki.dzkq.2017.0312

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