变质过程中的流体运移和稀土元素活动——庐山星子群变质脉体的微量元素地球化学

被引:7
作者
唐红峰
刘丛强
机构
[1] 中国科学院地球化学研究所矿床开放研究实验室!贵州贵阳
关键词
变质流体; 稀土元素的活动性; 星子群; 庐山; 江西省;
D O I
10.19700/j.0379-1726.2000.05.006
中图分类号
P595 [元素地球化学];
学科分类号
070902 ;
摘要
对庐山栖贤寺和黄岩寺两地星子群沉积变质岩及其中脉体的微量元素地球化学进行了研究。结果显示,栖贤寺变质石英脉继承了其围岩(变粒岩)的稀土元素地球化学特征,表明形成石英脉的流体来源于围岩;而黄岩寺以长英质脉为主的变质脉体与其围岩(主要是片岩)的稀土元素特征有较大的差异,显示了原岩组成对变质流体组成、性质及由流体导致的稀土元素活动性特点有明显的制约。此外,两地脉体的微量元素对Zr-Hf和U-Th均与变质岩不同,且有明显的分异,指示了脉体是流体作用的产物。变质流体通过侧向扩散作用形成了星子群变沉积岩中的变质脉体。
引用
收藏
页码:447 / 454
页数:2
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