黄明达,崔晓庄,裴圣良,张恒利,张建强

• 1:中国煤炭地质总局勘查研究总院
• 2:中国地质调查局成都地质调查中心
• 3:桂林理工大学

摘要(Abstract)：

兴安地块呼伦湖东岸白音高老组主要由凝灰岩和流纹岩组成,其形成时代和构造背景一直存在较大争议。通过对采自白音高老组的流纹岩进行LA-ICP-MS锆石U-Pb定年,结果显示其结晶年龄为144.3±0.6 Ma(MWSD=0.74),属早白垩世。岩石地球化学特征表明白音高老组流纹岩属高钾钙碱性系列,亏损Ba、Sr、Ti元素,Rb、Th、Pb等相对富集,稀土元素配分模式为轻稀土富集右倾型,轻重稀土分馏明显,具有明显Eu负异常。综合研究表明,呼伦湖东岸白音高老组的流纹岩岩浆来源于下地壳基性岩石的部分熔融,应形成于非造山板内伸展构造环境中。

关键词(KeyWords)： 白音高老组;流纹岩;锆石U-Pb年龄;地球化学;早白垩纪;兴安地块

Abstract:

Keywords:

基金项目(Foundation): 东北地区特殊用煤资源潜力调查评价(DD20160187-3);; 国家自然科学基金(41502114)

作者(Author): 黄明达,崔晓庄,裴圣良,张恒利,张建强

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