松辽盆地开鲁地区明水组沉积特征及控矿因素分析OA

To clarify the structural-sedimentary characteristics and uranium metallogenic potential of Mingshui Formation in Kailu area,western Songliao Basin,so as to support regional uranium exploration efforts,this study systematically analyzes the tectonic setting,sedimentary features,and uranium mineralization conditions based on regional geological data and drill core information by field investigations,sampling,geophysical logging,drilling profile logging,and integrated analysis.The results indicated that the sedimentary system of Mingshui Formation in the study area was dominated by terrigenous clastic fluvial-deltaic systems,mainly including braided river,meandering river,and delta facies,with the meandering river facies being the most developed.The regional structural framework forms a complete groundwater recharge-runoff-discharge system.Uranium mineralization was jointly controlled by uranium sources,oxidation zones,and fault structures.The mineralization process can be divided into two stages:the sedimentation and burial stage of pre-metallogenic potential uranium-bearing rock series,and the uplift and mineralization stage of uranium reservoirs during the metallogenic period.Uranium mineralization mainly occurs as tabular or lentiform bodies within the variegated mudstone-sandstone of the first member of the Mingshui Formation,with uranium anomalies and mineralized horizons primarily located in the low-to-high resistivity transition zone.Comprehensive analysis suggests that the first member of Mingshui Formation in Kailu area has significant uranium metallogenic potential,with specific sedimentary zones in the upper and lower reaches of the meandering river being favorable targets for uranium enrichment.