广西容县盆地铀矿地质特征及控矿规律

Geological characteristics and ore-controlling regularity of uranium deposits in Rongxian Basin of Guangxi

容县盆地是广西中新生代盆地中最早发现铀矿化的盆地,其沉积类型属于火山-沉积碎屑岩型。在认识盆地成矿地质背景、地质特征基础上,对盆地铀矿地质特征及典型矿床地质特征进行总结,分析其成矿作用。铀矿体产于盆地的古近系邕宁群(EY)砂砾岩中,或产于盆地与基底及边缘接触带或附近的断裂带、火山熔岩的接触带中,成因类型上属于沉积叠加后生热液改造型。

The uranium mineralization is firstly discovered in Rongxian Basin,which is one of the Meso-Cenozoic basins in Guangxi,and its sedimentary style is belonged to the volcanic-sedimentary clastic rock system.Based on the understanding of the metallogenic geological background and geological characteristics of the basin,the geological characteristics of uranium deposits and typical deposits in the basin are summarized,and the metallogenic processes are analyzed.The orebodies are hosted in the sandy conglomerate of the Paleogene Yongning Group（EY）in the basin,or in the contact zone between the basin and the basement and its margin,or in the vicinity of the fault zones,and in the contact zone of volcanic lava.The genetic mineralization type of uranium deposit is belonged to the later sedimentary and hydrothermal superposition pattern.