作　　者： (姜必广）; (何友宇）; (陈雄）; (罗文琴）; (谭奇）; (覃金宁）;

机构地区： 湖南省核工业地质局306大队,湖南衡阳421008

出　　处： 《铀矿地质》 2017年第5期266-272,共7页

摘　　要： "三九"地区三江口铀矿床为华南花岗岩地区典型的中低温热液型铀矿床,其大地构造位置处于诸广山南北向构造带与诸广-万洋山华夏复式断隆带的复合部位,定位于遂川-热水断裂、上堡断裂、塘湾断裂和四方坪断裂所构成的三角形构造地块内。该矿床的含矿流体包裹体特征研究表明,其成矿期脉体形成时的氧逸度高于矿前期,且成矿期脉体含有较多的沸腾包裹体。矿床的稀土元素特征表明,北部九龙江地段铀矿(化)体为弱酸性环境下的成矿作用产物;南部石壁窝地段铀矿(化)体为弱碱性环境下的产物。岩(矿)石同位素特征表明,铀成矿物质来源具有壳幔源混合特点;水源主要来自于大气降水,部分来源于岩浆水。铀成矿过程主要经历了构造-岩浆演化、含矿流体形成及运移、矿质沸腾沉淀和蚀变交代叠加4个阶段。矿床的成矿模式属于"加气(ΣCO2)去气(ΣCO2)成矿"模式范畴。 Sanjiangkou uranium deposit is a typical mid-low temperature hydrothermal type uranium de- posit in ＂San-Jiu＂ granite area of south China. In tectonic position, it is located in the composite part of south-north tectonic belt of Zhuguang mountain with Huaxia complex fault-uprising belt of Zhuguang to Wanyang mountain. The deposit is located in the triangular tectonic blocks which is controled by Suichuan to Reshui deep fracture, Shangbao fracture, Tangwan fracture and Sifangping fracture. The ore-bearing fluid inclusions character showed that the oxygen fugacity of vein matter formed in metallogenic epoch is higher than that in early epoch of mineralization, and the vein in metallogenic epoch contains more oiling inclusions. The REE character shew that uranium mineralization （ore bodies） of Jiulongjiang section in north is the products of weak acidic conditions, and uranium mineralization （ore bodies） of Shibiwo sec- tion in south is the products of weak alkaline environment. The rock and ore isotope characteristics in the deposit showed that the uranium ore-forming material source has the characteristics of crust mantle mix- ing water source of the uranium deposit, was mainly from atmospheric water and some form magmatic water. The uranium metallogenic process mainly experienced four stages of the tectono-magmatic evolu- tion, ore fluid formation and migration, ore materials precipition after boiling, alteration metasomatic and alteration superposition. The metallogenic model of deposit fall within the Air-entrapping （ECO2） Outgassing （ECO2） metallogenic model category.

关 键 词： 流体包裹体 同位素特征 成矿作用 成矿模式 三九 地区