铀矿地质2025，Vol.41Issue(2)：272-291,20.DOI:10.3969/j.issn.1000-0658.2025.41.020
巴音戈壁盆地乌力吉凹陷白垩系含铀岩系层序地层及铀成矿作用
Sequence Stratigraphy and Uranium Mineralization of Cretaceous Uranium Bearing Rock Series in Wuliji Sag,Bayingebi Basin
摘要
Abstract
Bayingebi Basin is an important uranium producing basin in north China.A large number of uranium anomalies have been found in Wuliji.The main target layer is the Lower Cretaceous Bayingebi Formation,which developed fan delta-shallow lake facies deposition.The distributary channel sandbodies in the fan delta plain and the distributary channel sandbodies in the fan delta front are favorable uranium reservoirs.On the basis of field investigation and analysis of a large number of borehole logging data,the authors divided the lower Cretaceous high resolution sequence stratigraphy and established the system tracts of different periods.The relationship between deposition,interlayer oxidation and uranium enrichment was discussed.The Lower Cretaceous Bayingebi Formation can be divided into two quaternary sequences(Sq1 and Sq2).Lower member of Bayingebi Formation(Sq1),Upper Member of Bayingebi Formation(Sq2).Sq2 is composed of lowstand system tract(LST),lacustrine expanding system tract(TST)and highstand system tract(HST).The lacustrine mudstones in the high system tract and overlying transgressive system tract form the favorable aquiclude.The sandbodies of thick big fan delta developed in the lower system tract and formed stable mud-sand-mud structure,which was beneficial to the migration of uranium-containing oxygen water.Organic matter and pyrite in fan delta sand body and dark mudstone in fan bay provide reduction medium for uranium mineralization.Mineralization occurs mainly in distributary channels,subaqueous distributary channels or fan delta mouth bars.Based on the study of sequence stratigraphy,a model of uranium deposit sequence,sedimentation and mineralization has been established,which provided reference for the prospecting of the same type of uranium deposit in the study area.关键词
层序地层学/剥蚀天窗/铀成矿作用/巴音戈壁盆地Key words
sequence stratigraphy/denudation window/uranium mineralization/Bayingebi Basin分类
地质学引用本文复制引用
郭煦劼,刘波,郝朋,秦彦伟,李鹏..巴音戈壁盆地乌力吉凹陷白垩系含铀岩系层序地层及铀成矿作用[J].铀矿地质,2025,41(2):272-291,20.基金项目
中国核工业地质局项目(编号:201903)和核工业二〇八大队自主科研项目联合资助. （编号:201903）
