摘要
河草坑地区铀矿床的流体包裹体类型复杂，有气体包裹体、气液包裹体、液体包裹体和含CO2包裹体4种类型。成矿期前流体包裹体均一温度为231．8～357．8℃，成矿期为163．4～300．3℃，成矿期后为125．4～190．9℃。从成矿期前-成矿期-成矿期后均一温度逐渐降低，但盐度变化不大（均〈7％）。成矿期流体根据均一温度可以划分为3个阶段，148．7～180℃、180～260℃和260～328．1℃，并于370．1℃至438．7℃期间发生过减压沸腾作用，流体中CO2气体的逸出，导致成矿流体中铀的沉淀、富集。河草坑地区铀矿床成矿期流体包裹体的均一温度与盐度均非常相近，可能为同一来源，与赋矿围岩没有必然联系。
Fluid inclusion types from uranium deposits in Hecaokeng area are complex. Four types inclusion such as vapor, vapor-aqueous, aqueous, and CO2-bearing inclusions are found. Homogenization temperature of fluid inclusion trapped in the early, middle and late ore forming stages concentrated at 231.8 357.8℃, 163.4 - 300.3℃ and 125.4 - 190.9℃, respectively. From early stage to late stage the homogenization temperature reduced gradually, but the salinity have no distinct change. And the oreforming fluid can be divided into 3 phases on homogenization temperature： 148.7 - 180℃, 180- 260℃ and 260 - 328.1℃. Fluid decompression-boiling occurred probably at 370.1℃ to 438.7℃, with the escape of CO2, which might cause the uranium to precipitate from the ore-forming fluid. Similar homogenization temperature and salinity of the ore-forming fluid from uranium deposits of Hecaokeng area suggest that they might come from the same source and have no relation with the wall-rock.
出处
《铀矿地质》
CAS
CSCD
2008年第3期137-142,共6页
Uranium Geology
基金
中国核工业地质局地质项目(地D0601)成果之一
南京大学国家重点实验室开放基金的资助
