松辽盆地西南部上第三系地浸砂岩型铀矿成矿条件及远景预测

THE METALLOGENIC CONDITIONS AND POTENTIAL OF THE UPPER TERTIARY IN-SITU LEACHING SANDSTONE URANIUM DEPOSIT IN SOUTHWESTERN SONGLIAO BASIN

运用水成铀矿理论的地质预测和评价预测,在对松辽盆地西南部上第三系地层结构、岩性岩相特征、古气候、地球化学环境、水文地质条件及层间氧化带发育特征等控矿因素研究基础上,预测了成矿远景,认为舍伯吐地区、开鲁地区是层间氧化带砂岩型铀成矿远景地段,为本区进一步铀矿普查找矿指明了方向。

The southwest part of Songliao Basin is developed on the Xingan-Mongolian-Ji-Hei Hercynian folded belt, connected to the Mongolian-Daxinganling Hercynian folded belt on the northwest and bounded by the North China platform on the southeast. Applying criteria of geologic prognosis and evaluation for hydrogenic uranium deposit, we studied on the Upper Tertiary stratigraphy, lithofacies, lithology, paleoclimate, geochemical environment, hydrogeologic conditions and the interlayer oxidation zone of the southwestern Songliao Basin. The result shows that the Upper Tertiary interlayer oxidation zone has a positive metallogenic condition for sandstone type of uranium deposits. Therefore the potential areas for uranium prospecting of Shebotu and Kailu are predicted.