开鲁坳陷八仙筒地区明水组砂岩型铀矿成矿条件分析与找矿方向OA

Mingshui Formation within Kailu Depression has long been regarded as a non-key horizon,with low exploration levels for sandstone-type uranium deposits.This study aims to systematically evaluate its uranium metallogenic potential and identify new strategic backup base for uranium prospecting within Songliao Basin.The ore-forming conditions of Mingshui Formation sandstone-type uranium deposits was comprehensively analyzed from four dimensions:uranium source supply capability,tectonic evolution,sedimentary facies and sandbody distribution patterns,and post-diagenetic oxidation-reduction modification processes by core observation,well-log interpretation,map compilation,and trace element geochemical data analysis.A two stages preliminary uranium metallogenic model was established with pre-mineralization sedimentation and burial phase of potential uranium-bearing sequences,and the ore-forming uplift and mineralization phase of the uranium-hosting reservoir.Based on this model,a favorable prospective area was delineated in Baxianti–Dongming region combined with prospecting indicators.The prospective area was believed with abundant uranium sources,stable sandbodies,structural slopes,topographic transition zones,epigenetic alterations,and uranium mineralization signatures,which can be qualified as a strategic back up base for sandstone-type uranium exploration in Songliao Basin.