诸广中段三九地区铀矿化特征及成矿机理探讨

DISCUSSION ON URANIUM MINERALIZATION CHARACTERISTICS AND METALLOGENIC MECHANISM OF SANJIU AREA IN THE MIDDLE PART OF ZHUGUANG ROCKBODY

三九地区铀矿化类型主要为花岗岩热液脉型和碎裂蚀变岩型。成矿热液活动由早阶段到晚阶段在空间上似具有由高向低、氧逸度具由低到高的演变特征。岩体的自变质和碱交代作用及其外接触带的气化热力变质作用是成矿元素（铀）的活化、迁移及预富集的重要成矿地质作用；热液沸腾、交代蚀变及环流冷却是主要的铀成矿作用机制。

The main uranium mineralizations in Sanjiu area are hydrothermal vein type and cataclastic altered rock type in granites. From early to late stage metallogenic hydrothermal activity evolves from high to low altitude in space, and the oxygen fugacity changes frow lowto high value. The autometamorphism of the rockbody and alkaline metasomatism, as wellas pneumatolytic pyromorphism at exocontact zone play a very important role to the remobilization, migration and pre-enrichment of ore-forming element (U). Hydrothermal solutionboiling, metasomatic alteration and circulation cooling are major uranium ore-forming factors.