摘要
本文对赣杭构造带几个有代表性的火山岩型铀矿床进行了U-Pb同位素体系研究,证明铀源主要来自富铀的火山岩系。铀成矿作用研究表明不同的矿化类型发生的年代不同,可划分3期:碱交代型铀矿化年龄为110—120Ma;绿泥石-硫化物型铀矿化年龄为90-100Ma;硅质脉型铀矿化年龄为75Ma。在同一铀矿床中铀的成矿作用有多期多阶段叠加的特点,这是寻找富铀矿床的重要标志。
The study of U-Pb isotopic systems with representative volcanite type uranium deposits in Gan-Hang tectonic belts indicates that the uranium source was mainly derived from the rich uranium volcanic rock series. The uranmm mlnerahzation shows that different types of mineralization have different mineralization ages, which could be divided into three periods: 1) 110—120 Ma—the age of alkali-metasomatism type uranium mineralization; 2) 90—100 Ma—the age of chlorite-sulfide type uranium mineralization; and 3) 75 ma—the age of silic-vein type uranium mineralization.The uranium mioeralization in the same uranium deposit generaily has superimposed characteristics of the multi-period and multi-stage, which should be an important guide for searching rich-uranium deposits.
出处
《铀矿地质》
CSCD
北大核心
1990年第5期257-264,273,共9页
Uranium Geology
关键词
铀矿
同位素
年龄
铀源
构造带
Gan-Hang tectonic belts, U-Pb isochron, Volcanite type uranium dcposit, Uranium source
