摘要
巴彦塔拉盆地砂岩型铀矿床产于下白垩统赛汉塔拉组下段辫状河流相砂岩中。本文通过对含矿主岩沉积特征、矿化和矿床蚀变特征的分析研究 ,认为早期为潜水氧化蚀变成矿 ;晚期为层间氧化 油气还原蚀变成矿 ,即来自蚀源区和天窗补给的含铀、含氧地下水遇沿断裂 (F2 1)上升的含H2
The sandstone-type uranium deposit in Bayantala basin is hosted in braided channel sand body of the Lower member of Saihantala Formation,Lower Cretaceous.On the basis of the research on characteristics of uranium-hosting sediments,and alteration features at the uranium deposit,authors suggest that the early alteration is of phreatic oxidation and the later alteration is originated from interlayer oxidation and reduction by oil and gas,i.e. when the oxygen-and uranium-bearing groundwater coming from the proverance encounters the ascending H 2S gas along F 21 fault,the uranium is reduced by the H 2S and precipitated leading to the uranium ore-formation.
出处
《铀矿地质》
CAS
CSCD
2004年第4期205-212,共8页
Uranium Geology
关键词
巴彦塔拉盆地
砂岩型铀矿床
蚀变特征
Bayantala basin
sandstone-type uranium deposit
alteration features
