Spatial-Temporal Coupling of Key Ore-Controlling Factors for Sandstone-Type Uranium Deposits in Tiefa Area,Songliao Basin
Peng Hu
Jiao Yangquan
Rong Hui
Pang Bo
Lü Donglin
Guo Xiaodan
Wang Qingshuang
Yuwen Xiaoyi
Abstract：A new uranium deposit and many uranium mineralization spots have been discovered in the Cretaceous strata of the Tiefa area in the southeastern Songliao basin. Based on the regional geological background investigation and the analysis of more than 1000 drilling data,the author conducts a quantitative and systematic study on the key ore-controlling factors,such as uranium reservoir,interlayer oxidation zone and reducing medium in the uranium metallogenic system from source to sink in the study area. The sandstone-type uranium deposits in the study area have experienced two important stages:the pre-enrichment stage in the depositional stage and the main metallogenic stage in the interlayer oxidation stage. The basin-mountain coupling driven by regional tectonic evolution not only controls the formation and migration of uranium sources,but also drives the tectonic inversion between the two metallogenic stages. The distribution law of uranium mineralization in the study area has obvious spatial coupling relationship with ore control factors such as uranium reservoir heterogeneity,oxidized sand body size,and reducing medium,etc. The gray mudstone at the bottom of the 3rd member of Quantou Formation and the coal seam at the top of the Fuxin Formation restrict the scale of the interlayer oxidation zone and the distribution of uranium mineralization. The 3rd member of Quantou Formation has developed uranium reservoir sand bodies with a complete "mud-sand-mud" structure and obvious clues of uranium mineralization. It is the most favorable layer for sandstone-type uranium mineralization in this area,followed by the glutenite at the bottom of the Fuxin Formation in the western margin of the depression. The most favorable parts for sandstone-type uranium mineralization is in the west of the depression,where the sandstone body of uranium reservoir in the 3rd member of Quantou Formation has changed from thick to thin,the sand content has changed from high to low,the ratio of the thickness to the oxidized sand body decreased,and the external reducing geological bodies such as gray mudstone and coal seams have changed from thin to thick.
Keywords：sandstone-type uranium depositSongliao basin3rd member of Quantou Formationuranium reservoirore-controlling factorssedimentologyore deposits
Publication Date：2024-09-15
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 3182-3198 )