诸广铀成矿区矿床成因探讨

本文通过对诸广地区内生铀矿床成矿地质背景分析，系统论述了矿区地质特征及矿床地球化学特征，对本区矿床成因进行了探讨，提出诸广地区存在富铀的前寒武纪结晶基底；成矿物质来源于上地幔流体与下地壳富铀前寒武纪结晶基底的混熔交代；成矿作用受晚中生代伸展裂陷构造——深源热流体演化机制控制，形成中高温热流体充填成矿的高品位脉型矿化和中低温热流体交代成矿的较低品位碎裂蚀变岩－微脉浸染型矿化。

DISCUSSION ON GENESIS OF URANIUM DEPOSITS IN ZHUGUANG URANIUM METALLOGENIC REGION

On the basis of the analysis of metallogenic geologic setting of endogenic uranium deposits in Zhuguang region,this paper systematically describes geologic characteristics and geochemical features,and discusses the genesis of uranium deposits in the region.The authors come to the conclusion that:a U rich Precambrian crystalline basement exists in the Zhuguang region;the ore forming material-uranium is originated from mixed melting and metasomatism of U rich Precambrian crystalline basement (lower crust) and fluid of upper mantle;the ore forming process is controlled by the mechanism of Mesozoic extensional taphrogenic tectonics and the evolution of deep sourced heat fluids,forming high grade mineralization of medium high temperature heat fluid filling and low grade cataclastic altered rock veinlet disseminated mineralization of medium low temperature heat fluids.