中蒙边境额仁淖尔地区包饶勒敖包石英闪长岩锆石U-Pb年龄及构造意义
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摘要
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。
The LA-ICP-MS zircon U-Pb dating of Baoraole'aobao quartz-diorite pluton in the Eren Nur area shows that its age is(302.5±1.1)Ma(MSWD=0.28),indicating that this pluton was formed in the late stage of Late Carboniferous Epoch,belonging to Variscan period.The lithogeochemical results suggest that the quartz-diorites in this area possess high TiO_2 and Al_2O_3,with values Mg~# of 0.46-0.50,A/CNK ratios of 0.77-0.90andδvalues of 1.54-2.53,showing the geochemical characteristics of middle-and high-K calc-alkaline series with metaluminous.REE have medium abundance and show right-dipping pattern of enriched LREE and depleted HREE,with not obvious or weakly negative Eu anomaly.The LILE(Rb,Ba and K)are enriched,while the HFSE(Nb,Ta,P and Ti)are depleted,having the geochemical characteristics of island arc magmatic rocks,suggesting that the subduction events occurred in the Baoraoleaobao area at the end of Late Carboniferous Epoch.The comparison of the regional geological data reveals that this pluton belongs to a part of Xiwuqi-Suzuoqi magmatic arc,which provides a new evidence for further studying the evolution process of Xilinhot-Suzuoqi suture zone subducted toward Suolun area in Late Carboniferous Epoch.
The LA-ICP-MS zircon U-Pb dating of Baoraole'aobao quartz-diorite pluton in the Eren Nur area shows that its age is(302.5±1.1)Ma(MSWD=0.28),indicating that this pluton was formed in the late stage of Late Carboniferous Epoch,belonging to Variscan period.The lithogeochemical results suggest that the quartz-diorites in this area possess high TiO_2 and Al_2O_3,with values Mg~# of 0.46-0.50,A/CNK ratios of 0.77-0.90andδvalues of 1.54-2.53,showing the geochemical characteristics of middle-and high-K calc-alkaline series with metaluminous.REE have medium abundance and show right-dipping pattern of enriched LREE and depleted HREE,with not obvious or weakly negative Eu anomaly.The LILE(Rb,Ba and K)are enriched,while the HFSE(Nb,Ta,P and Ti)are depleted,having the geochemical characteristics of island arc magmatic rocks,suggesting that the subduction events occurred in the Baoraoleaobao area at the end of Late Carboniferous Epoch.The comparison of the regional geological data reveals that this pluton belongs to a part of Xiwuqi-Suzuoqi magmatic arc,which provides a new evidence for further studying the evolution process of Xilinhot-Suzuoqi suture zone subducted toward Suolun area in Late Carboniferous Epoch.
引文
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