富铀花岗岩源岩特征

The source rock characters of U-rich granite

论述了华南陆壳的地层结构、岩性组合及其含铀性,各个构造旋回对铀的活化、迁移和富集作用。指出富铀花岗岩的源岩特征是:具有高硅、富铝、富钾的富铀陆壳。岩石组合主要以陆源泥砂质碎屑岩建造为主,夹中酸性、基性火山碎屑岩建造和碳酸盐岩建造等所组成的岩石。岩石经受了多次构造运动,使其发生不同程度的区域变质作用和混合岩化、花岗岩化,最终形成富铀花岗岩。

This paper discusses the stratum composition,lithological association,uranium content of crust and the activation,migration,concentration of uranium at each tectonic cycle in South China.The authors point out that the source rock of U-rich granite is U-rich continental crust which is rich in Si,Al and K.The lithological association is mainly composed of terrestrial clastic rocks formation of mudstone and sandstone,mingled with intermediate-acidic,mafic pyroclastic rocks and carbonate rocks formation.During tectonic movements,the rocks had undergone regional metamorphism,migmatitization,granitization,and formed U-rich granites finally.