赞皇斜长角闪片麻岩地球化学特征及其构造环境探讨

被引:9
作者
肖玲玲
蒋宗胜
机构
[1] 中国科学院研究生院地学院
关键词
华北克拉通; 中部带; 赞皇变质杂岩; 斜长角闪片麻岩; 构造判别;
D O I
暂无
中图分类号
P588.345 [];
学科分类号
070901 ;
摘要
赞皇变质杂岩位于华北克拉通中部造山带的中南段,斜长角闪片麻岩是构成其前寒武纪基底的主要变质岩之一。通过野外地质调查、岩相学以及地球化学特征研究,发现赞皇斜长角闪片麻岩的原岩为拉斑-钙碱玄武质岩石,其稀土总量变化较大(41.38×10-6~232.55×10-6),轻稀土轻微富集,稀土配分模式近平坦,几乎无Eu异常。原始地幔标准化微量元素蛛网图显示其富集大离子亲石元素K、Rb、Ba,高场强元素Nb、Ta存在明显负异常,Ti弱亏损。地球化学特征和多种构造环境判别图解均表明,形成环境类似于现代大陆边缘岛弧构造环境,推测其形成与华北克拉通西部陆块与东部陆块间的俯冲碰撞有关。
引用
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页码:339 / 347
页数:9
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