希望-竹山下地区硅化碎裂岩、碎裂花岗岩微量和稀土元素地球化学特征

Trace and REE elements geochemical characteristics of the silicified cataclasite and cataclastic granite in Xiwang-Zhushanxia area

本文对希望-竹山下矿床外围铀矿化较好的硅化碎裂岩、碎裂花岗岩进行微量元素和稀土元素进行系统分析。结果表明,硅化碎裂岩、碎裂花岗岩富集Rb、La、Ce元素,明显亏损元素Ba、Sr和轻微亏损元素Nb、Zr,具有较高的Rb/Sr比值,硅化碎裂岩型矿石Zr元素亏损明显,反映矿石形成过程中有地壳物质混染;稀土总量ΣREE、Sm-Nd图解反映出矿石稀土元素主要继承了围岩中稀土元素特征,成矿流体运移过程中萃取了围岩中易被迁移的稀土元素。

Trace elements and rare earth elements of silicified cataclasts and cataclastic granites with better uranium mineralization are systematically analyzed in this paper.The results show that the silicified cataclastic rocks and cataclastic granites are rich in Rb,La and CE elements,and Ba,Sr and Nb and Zr are obviously deficient elements,with a higher rb/sr ratio.The Zr element loss of silicified cataclastic ore is obvious,which reflects the mixed contamination of crust material in the process of ore formation.Total rare earthΣREE and SM nd diagrams show that the REE in ore mainly inherits the characteristics of rare earth elements in surrounding rock,and the easily migrated rare earth elements in surrounding rock are extracted during the process of ore-forming fluid migration.