鄂尔多斯盆地西南缘固原-泾源地区航放铀异常特征及铀成矿条件分析OA

Low exploration level for sandstone-type uranium deposits in the Guyuan-Jingyuan area on the southwestern margin of the Ordos Basin,lead the key exploration factors remain unresolved,which include uranium prospecting potential and the key target sectors.To rapidly collect prospecting information,1:50 000 airborne radiometric survey was conducted in this area.Through line-by-line analysis and screening,six airborne radiometric anomalies were identified,two of which were selected for integrated ground verification using ground gamma-ray spectrometry,radon gas measurement,and geological mapping,combined with a comprehensive analysis of structural features interpreted from aeromagnetic data.The results indicated that the preferred airborne radiometric uranium anomalies,HFU-21 and HFU-24,are mainly hosted in the Liwaxia Formation of the Lower Cretaceous Liupanshan Group.Ground gamma-ray spectrometry revealed maximum measured uranium concentrations of 216 μg/g and 80 μg/g,respectively,accompanied by high soil radon concentration anomalies,indicating significant uranium enrichment.Furthermore,the two anomalous areas are with favorable uranium source,structural,and hydrogeological conditions.Comprehensive analysis suggests that the HFU-21 and HFU-24 anomaly sectors are favorable targets for uranium exploration,indicating considerable uranium metallogenic potential in this area.