准噶尔盆地航放弱信息提取与砂岩型铀矿高效勘查启示OA

Airborne gamma-ray spectrometry survey(abbreviated as airborne radioactivity survey)enables the rapid large-scale surveys and on-site determination of uranium,thorium,and potassium concentrations,rendering it an indispensable and crucial method for the efficient exploration of sandstone-type uranium deposits.Initially,airborne radioactivity surveys were primarily focused on the erosion source areas and marginal zones of basins,while the central regions of basins,particularly those covered by deserts,remained unsurveyed.In recent years,with the advent of new theories and insights into sandstone-type mineralization,coupled with heightened demands for efficient exploration,conducting supplementary surveys and mining weak information in previously unsurveyed areas have emerged as pivotal tasks for the comprehensive and systematic prediction and evaluation of sandstone-type uranium deposits within basins.This study employs techniques such as active uranium analysis,favorable indicator U5,and fractal theory,optimizing parameters to extract weak information anomalies indicative of sandstone-type uranium mineralization in Junggar Basin and analyzed the mechanisms and patterns governing uranium migration and enrichment by integrating metallogenic factors such as strata and fault structures,as well as anomaly layers of uranium mineralization information extracted from aeromagnetic,airborne radiometric,soil radon,and component data.The weighted evidence method was used to conduct a comprehensive extraction of multi-source information on uranium mineralization,to obtain the posterior probability of comprehensive uranium mineralization information in the Junggar Basin.Based on the posterior probability anomalies,16 prospective areas with significant potential were inferred and delineated for sandstone-type uranium mineralization.The application results show that the airborne radioactive weak information extraction has achieved remarkable results in the exploration of sandstone-type uranium deposits in the basin-covered area,and has a good application prospect.In the prospecting for uranium deposits in similar areas,the identification and extraction of weak mineralization information is the key technjiques in airborne radioactivity surveys and provide crucial support for deep prospecting,which can effectively identified the deep uranium mineralization combined with ground verification and multi-source information techniques.