松辽盆地第三系可地浸砂岩型铀矿找矿方向

THE PROSPECTING DIRECTION FOR IN-SITU LEACHABLE SANDSTONE-TYPE URANIUM DEPOSIT IN SONG-LIAO BASIN

松辽盆地是在兴蒙－吉黑海西褶皱带上发育起来的中、新生代大型陆相沉积盆地，基底主要为古生界浅变质岩，盖层主要是白垩系杂砂岩－有机页岩建造和新生界疏松碎屑堆积。笔者通过对前人资料分析研究后认为：松辽盆地具有良好的成矿地质条件和找矿前景；第三系是寻找可地浸砂岩型铀矿的主要目的层之一，层间氧化带型铀矿是主要寻找类型；盆地的西部和西南部是寻找可地浸砂岩型铀矿远景区。

Song-liao basin is a large Mesozoic-Cenozoic continental depositional basin developed in Xingmeng-Jihei Hercynian fold belt. Its basement is mainly composed of Paleozoic epimetamorphic rocks and the cover mostly consists of Cretaceous graywacke and organic shale formation,as well as Cenozoic loose elastic accumulations. On the basis of analyzing previous data, this paper proposes the following ideas: Song-liao basin is Of favourable metallogenic geologic conditions and good prospecting potential;Tertiary is the key target bed for prospecting in-situ leachable sandstone uranium deposits;interlayer oxidation zone type uranium deposit is the major type for current prospecting work;the west part and the southwest part of the basin are the prospects for exploring in-situ leachable sandstone uranium deposits.