铀矿地质2025，Vol.41Issue(5)：810-821,12.DOI:10.3969/j.issn.1000-0658.2025.41.056
海拉尔盆地克鲁伦凹陷下白垩统层序地层格架及沉积演化特征
Sequence Stratigraphic Framework and Evolution Characteristics of Lower Cretaceous in Kelulun Sag,Hailaer Basin
摘要
Abstract
In response to the unclear stratigraphic division and complex and variable facies zones in Lower Cretaceous of Hailar Basin,a hierarchical division of Lower Cretaceous was carried out based on seismic,logging curves,core data,and other data.On the basis of the isochronous stratigraphic framework,a sequence stratigraphic framework of Lower Cretaceous was established.Research has shown that Lower Cretaceous can be divided into four third-order sequences,among which SQ1 was deposited during the faulting period,with strong tectonic activity and high sedimentation rate.During this period,there was a significant development of alluvial coarse debris.The sedimentation period of SQ2 was a period of weakened faulting activity,with the appearance and gradual expansion of the lake basin to its peak.There was a significant uplift phenomenon at the edge of the basin,and the fan delta underwent retrogradation.At this time,the source material was still the northwest oriented Adunchulu pluton,and the southeast oriented Hanwula uplift was only a low rise"water barrier".The sedimentation period of SQ3-SQ4 was a period of fault-depression transition,during which the lake basin began to shrink and the southeast oriented Hanwula uplift began to rise and became the second source area within the sag.The sedimentary center gradually migrated towards the central part of the basin.The sedimentary sequence of Lower Cretaceous in Kerulun Sag determines the vertical lithological combination and distribution characteristics,thereby controlling the formation of the system tract.Comprehensive analysis suggests that the high and low system tracts are more likely to develop large skeletal sand bodies and sufficient post oxidation,which are favorable for the formation of sandstone uranium reservoirs.关键词
下白垩统/层序地层/沉积演化/砂岩型铀矿/海拉尔盆地Key words
Lower Cretaceous/sequence stratigraphy/sedimentary evolution/sandstone type uranium deposits/Hailaer Basin分类
天文与地球科学引用本文复制引用
崔雅男,周文博,王长虹,万宏峰,赵曙光..海拉尔盆地克鲁伦凹陷下白垩统层序地层格架及沉积演化特征[J].铀矿地质,2025,41(5):810-821,12.基金项目
中国核工业地质局项目"内蒙古海拉尔盆地铀矿资源调查评价项目"(编号:202102)资助. （编号:202102）
