摘要
本文论述了中低温热液铀矿床中沥青铀矿的壳圈结构、韵律沉淀结构和针状结构的可能形成机理。并认为沥青铀矿的某些结构特征是推断成矿热液物理化学状态及其演化的依据之一。
The possible formation mechanism of three textures or pitchblende is theoretically discussed in the present paper based on the research data. Pitchblende in meso- and epithermal uranium deposits often shows shell-ring, rhythmical and acicular textures. The formation of these textures in pitchblende is principally controlled by the following factors: a) stages of reduction of uranium oxides (the possible sequence of reduction of uranium oxides is UO_3→U_3O_6→U_5O_(13) (or U_8O_(21))→U_3O_7→U_4O_2→U_8O_(17)→UO_2); b) speed and degree reduction of uranium oxides; c) evolution of Eh, pH and CO_2 activity in ore solutions during precipitation of uranium minerals.
Some textures of pitchblende are one of the grounds for inferring physicochemical conditions of ore-forming solutions and their evolution.
出处
《地质论评》
CAS
CSCD
北大核心
1991年第1期64-69,共6页
Geological Review
