Discussion on the Geological Characteristics of Uranium Mineralization and Prospecting Direction in Donggouying Volcanic Basin,Zhalantun Area
Donggooying volcanic basin is located to the north of Zhalantun and in the north-central section of the Greater Khingan Range.Late Jurassic volcanic rocks are widely developed in the basin.Due to the low level of geological survey in this area,previous researchers only conducted investigation in some uranium occurrences.The relationship between volcanic basins and uranium mineralization was not studied in depth and formed referring idea to the regional uranium exploration.In recent years,Research Institute 240 of CNNC has carried out medium-and large-scale uranium geological surveys,mineral site inspections,and resource evaluations in the volcanic basin.The geological conditions of uranium mineralizationand and ore-controlling factors was systematically studied and summarized in Donggooying volcanic basin.It was found that the basin had favourable uranium source in the basement,the main ore-controlling factors were the secondary fissures in the complex parts of deep and large faults,and the multi-cycle and multi-stage volcanic activity provided motivation channels and ore-forming fluid for the uranium mineralization.A large number of uranium prospects and airborne anomalies are developed in the basin with good geophysical and geochemical anomaly,which showed favourable overall uranium mineralization potential.The next step prospecting should focused on the basement contact zone at the edge of the basin and carry out deep exploration by fully considering the geological conditions of the basin's mineralization,with comprehensive geophysical prospecting methods.The main target is the sub-volcanic rock subtypes,attentions should also payed to the fissure-alteration zone subtype and interlayer fracture zone subtype.
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