关键词: 砂岩型铀矿, 姚家组, 四方台组, 反转构造, 成矿潜力, 层间氧化带, 松辽盆地北部

Abstract:  A lot of geological work has been carried out in the prospecting for sandstone-type uranium deposits in the southern Songliao basin, resulting in significant achievements. In contrast, the geological exploration work for uranium deposits in the northern Songliao basin is currently inadequate. In this paper, based on the analysis of uranium mineralization conditions, such as uranium-bearing rocks, basin tectonic evolution, paleoclimate, stratigraphic evolution, distribution of sedimentary facies, development of sand bodies and epigenetic reformation, etc., the mineralization potential of sandstone-type uranium deposits in the northern Songliao basin is comprehensively evaluated, and its prospecting direction is discussed. The northern Songliao basin is rich in uranium sources and has good metallogenic conditions. Since the Cretaceous, the basin has experienced four periods of tectonic inversion, forming two main uranium prospecting targets, Upper Cretaceous Yaojia Formation and Sifangtai Formation. Inside the basin, the Yaojia and Sifangtai Formations have well-developed sedimentary facies and sandbody conditions, and the oxidation is noticeable in some areas, and the oxidation zone and uranium mineralization are also relatively developed, providing important clues for ore prospecting. Comprehensive analysis shows that the overall uranium metallogenic conditions are good in the northern Songliao basin, with the Yaojia Formation being the key prospecting strata in the eastern section, and the Sifangtai Formation in the western section. The ore exploration type is interlayer oxidation zone type.

Key words: sandstone-type uranium, Yaojia Formation, Sifangtai Formation, inversion structure, metallogenetic potential, interlayer oxidation zone, northern , Songliao basin