相山铀矿田成矿水热系统古水文地质研究

PALEOHYDROGEOLOGICAL STUDY OF THE ORE FORMING HYDROTHERMAL SYSTEM IN XIANGSHAN URANIUM FIELD

在分析华东南相山铀矿田成矿地质背景、古气候条件基础上，运用古水文地质分析方法研究铀成矿古水热系统的构造——古水文地质条件和古水动力条件。划分了两个古水文地质期和两个古水文地质区，确定了成矿古水热系统补给区、排泄区位置，并分析了水循环过程中铀的矿化形成过程。研究结果表明相山铀矿田的形成是由于大气降水在补给区渗入地下，经深循环加温和水岩相互作用形成的富铀成矿热液在古水热系统排泄区（减压区）沉淀富集成矿。

On the basis of the analysis on geological background,paleoclimatic condition in Xiangshan uranium field,southeastern China,the authors first study and inquire into tecto paleohydrogeological and paleohydrodynamic conditions of uranium forming hydrothermal system by using paleohydrogeological method.Then two paleohydrogeological periods and two paleohydrogeological areas are divided,the places of recharge area and discharge area of the ore forming hydrothermal system are determined.Finally,the authors simply summarize uranium mineralization process in the course of water circulation.The results show that the origin of Xiangshan uranium field is as a result of meteoric water permeating underground in recharge area,and forming uranium rich solution by deep circulation and adding temperature,finally,precipitating and collecting uranium in discharge area (depressure area) of ore forming hydrothermal system.