陈蔡群变质岩铀的地球化学特征  

GEOCHEMICAL CHARACTERISTICS OF URANIUM OF CHENCAI GROUP METAMORPHIC ROCKS

作　　者：陈迪云[1] 徐伟昌[2] 

机构地区：[1]南京大学地科系,210000 [2]华东地质学院,江西抚州344000

出　　处：《铀矿地质》1993年第4期31-37,50,共8页Uranium Geology

摘　　要：本文对陈蔡群变质岩铀的丰度及其赋存形式进行了研究。铀主要以分散吸附状态的方式存在。少量的铀以微粒、超微粒的铀矿物或含铀矿物的方式赋存在矿物裂隙或粒间,铀在变质作用中发生了重新分配。U-Pb同位素的研究表明岩石中的铀在变质作用及后期的其它地质作用中有大量的丢失,原始铀含量高。含矿火山岩与陈蔡群变质岩的地球化学特征对比表明,两者的地球化学特征有许多相似之处。作者认为,陈蔡群是形成铀矿床的可能铀源层之一。The abundance and the existence form of uranium in Chencai Group metamorphic rocks have been studied in this paper. The uranium exists mainly as disseminated and adsorption form,minor uranium exists in the fissure of mineral or margin of mineral as mierograin and super micrograin uranium or uranium-bearing minerals. The uranium was redistributed during metamorphism. According to the result of U-Pb isotope system study,large amount of uranium in rocks was lost in late geological process. The comparison of geochemical characteristics between ore-bearing volcanic rocks and Chencai Group metamorphic rocks shows much similarity. The authors suggest that the Chencai Group is one of the possible source bed for uranium deposits formed.

关 键 词：陈蔡群 铀地球化学 变质岩 

分 类 号：P5[天文地球—地质学]