Metallogenic condition analysis and prospecting direction prediction of sandstone type uranium deposit in Kunbei area,Qaidam Basin
Based on the systematic analysis of uranium source conditions,structural characteristics,lithologic lithofacies characteristics,hydrogeological characteristics,reoxidation conditions and discovered uranium mineralization information in Kunbei area of Qaidam Ba-sin,it is believed that this area has the basic metallogenic conditions of sandstone type uranium deposit.The development of beach bar sand in the Lower Youshashan Formation near the main fault of the structure in Qie 6 Block and near the Kunbei fault in the north is currently the focus of prospecting.The Kunlun Mountain orogenic belt in the southern margin provides rich uranium sources for this are-a.The slope structure is conducive to the migration of uranium ions from the erosion source area to the basin with oxygen-containing wa-ter.The developed faults and unconformities provide a good channel for the upward migration of deep oil and gas to form an oxidation-re-duction transition environment conducive to uranium ion precipitation.The light hydrocarbon molecules in deep oil and gas are the main source of reducing agents in this area,the braided river delta front mud-sand interlayer and beach bar sand are developed,and the groundwater"replenishment,diameter and discharge"system is perfect.The results of gamma ray anomaly screening,soil radon test and phase IP test all show that the uranium migration and accumulation in the north of Kunbei area are obviously controlled by structures,faults,unconformities and dominant reservoirs,and the potential uranium deposits are located at the local tectonic high point on the large slope,concentrated in the vicinity of faults and distributed along fault zones.
sandstone type uranium depositmetallogenic conditionsprospecting directionKunbei areaQaidam Basin
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