松辽盆地水动力系统和铀矿化类型浅析

Elementary analysis on the hydrodynamic system and uranium mineralization type in Songliao basin

据松辽盆地的演化过程和演化阶段,将盆地盖层结构划分为断陷期、坳陷期、反转期和新活化期4个构造层;通过盆地盖层结构特征分析,认为嫩江组1,2段区域性泥岩层构成松辽盆地的特殊构造,由此形成了上部渗入水动力系统;两套水动力系统形成3种铀矿化类型:渗入水层间氧化带型铀矿化(Ⅰ型)、渗出水改造型铀矿化(Ⅱ型)和混合型铀矿化(Ⅲ型)。

According to the basin evolution, the sedimentary covers in the basin could be divided into four main structural layers in ascending order： the fault-depression layer, dawn-warping layer, inversion layer and neo-activiation layer. Through analysing the characteristics of sediments, the paper suggests that regional mudstone in member one and member two of Nenjiang Formation forms a special structure in Songliao basin. Due to this special structure, the upper infiltration hydrodynamic system and lower infiltration hydrodynamic system are formed. The two hydrodynamic systems have embraced three kinds of uranium mineralization, which are interlayer oxidation zone type of infiltration water （Ⅰ type）, re- working type of seepage water （ Ⅱ type） and mixed type （ Ⅲ type）.