摘要
本文列举了国内外层间氧化带砂岩型铀矿床中的一些褪色现象 ,从宏观到微观地分析了褪色带的成因 ,认为褪色带的形成是在层间氧化带形成后 ,由深部上升的还原性气体或油气对氧化砂体进行还原的产物。运用国内外典型的事例说明主要工业铀矿体产于褪色带与原生带之间 ,由于褪色带是次生还原的产物 ,往往会将褪色带误认为是原生带 ,从而导致主要工业铀矿体漏失。由此分析推断出 :乌库尔其地区西部的 2 5 3线一带和中部的 3 89～ 42 1线一带第Ⅴ旋回铀矿体可能还在沿倾向向前延伸 ,目前已揭露的铀晕带是褪色带而不是还原带 ,这些地段的铀矿找矿工作应重新认识评价。
This paper introduces some examples of bleached zone in interlayer oxidation zone at sandstone-type uranium deposits at home and abroad,and analyses the genesis of bleached zone both macroscopically and microscopically.Authors suggest that the bleached zone is originated from the reduction of oxidized sand bodies by reducing gas of oil-gas ascending from the deep after the formation of interlayer oxidation zone,that main uranium orebodies are located between bleached zone and zone of primary unaltered rocks.As the bleached zone is the result of secondary reduction of oxidized sandstone,it might be wrongly regarded as unaltered primary grey sandstone thus leading to the missing out of uranium orebodies.From the above discussion,a deduction could be made,that uranium orebodies may occur in V-depositional cycle further ahead to the north of explored area,at the area of exploration line No.253,the western area of Wukurqi deposit,and the area between exploration lines No.389～421,the middle of Wukurqi deposit.
出处
《铀矿地质》
CAS
CSCD
2004年第3期151-155,共5页
Uranium Geology
关键词
褪色带
层间氧化带
bleached zone
interlayer oxidation zone
