摘要
对热液成因脉型矿床为主的华南花岗岩型铀矿床成矿地质特征、含铀热液的流体来源、铀的迁移及沉淀机理研究状况进行了综述。含铀热液的大气降水是主要来源,次为幔源流体;铀的迁移形式和过程与铀在自然界的赋存状态有关,在含铀热液中铀主要以碳酸铀酰络合物和氟化铀酰络合物形式迁移,在氧逸度低的幔源流体中,铀可能以四价卤素元素络合物形式迁移;铀的沉淀与含铀热液物理-化学条件的改变有关,主要沉淀机制包括:温度和压力的快速降低、含铀热液浓缩作用及流体混合作用、幔源物质加入。对华南某一类型花岗岩型铀矿而言,可能是某一种沉淀机制发挥了主导作用,但这种沉淀机制不是惟一的,往往是多种沉淀机制相互叠加作用的结果。
This paper reviewed the study on the uranium metallogenetic geological characteristics,source of uranium-bearing hydrothermal fluid,mechanisms of uranium transportation and deposition of granite type uranium deposits which are dominated by hydrothermal vein types in South China.Uranium-bearing hydrothermal is mainly originated from atmospheric precipitation,and the mantlederived fluids come to the second.The form of uranium transportation is related to the occurrence state of uranium in nature.In uranium-bearing hydrothermal solution,uranium is mainly transported as uranyl carbonate complex and uranyl fluoride complex.The deposition of uranium is related to the change of the physical and chemical conditions of uranium-bearing hydrotherm.The main deposition mechanisms include rapid fall of the temperature and pressure,inspissation of the uranium-bearing hydrothermal solution and fluid mixing,and joining of the mantle-derived material.For a certain granite type uranium deposit in South China,one kind of deposition mechanism may play a leading role.But it is not the only one,it is often the result of the mutual superimposition of multiple precipitation.
出处
《世界核地质科学》
CAS
2015年第3期132-138,共7页
World Nuclear Geoscience
关键词
含铀热液
铀的迁移
铀的沉淀机制
花岗岩型铀矿
华南
uranium-bearing hydrotherm
uranium transportation
mechanisms of uranium deposition
granite type uranium deposits
South China
