铀矿地质2025，Vol.41Issue(5)：757-772,16.DOI:10.3969/j.issn.1000-0658.2025.41.052
松辽盆地南部层序地层特征及其对铀成矿的制约作用分析
Characteristics of Stratigraphic Sequences and Their Controlling Effect on Uranium Mineralization in Southern Songliao Basin
摘要
Abstract
In Late Cretaceous,the southern Songliao Basin deposited terrestrial sedimentary formation,which is a favorable for sandstone type uranium exploration.A metallogenic pattern of"all layer with mineralization,key layer aggregating to deposit"has been discovered,but the constraining effect of sequence stratigraphy on uranium enrichment and mineralization is not understood.Focusing on key uranium deposits and peripheral mining sites,this study aims to clarify the sequence stratigraphy characteristics and their constraining effects on uranium mineralization in the southern Songliao Basin based on the basic principles of sequence stratigraphy,and testified with geophysical and geochemical techniques.Four landmark geological historical events occurred in the Late Cretaceous period within the region,which constrained the stratigraphy and formed a sequence pattern of"three unconformities,three super sequences,and six sequences".The constraining effect of sequence stratigraphy on uranium mineralization can be summarized into four aspects.The coupling mechanism between basin and mountain formed by giant sequences and super sequences,and the weak planes in geological bodies formed by regional unconformities constitute deep channels for the migration of ore-forming fluids.The sequence responding to the paleoclimate constrains the native geochemical environment,ensuring that uranium migrated from the surface and infiltrate to the strata with groundwater.The grain size differences in geological bodies formed under different system domains affect the later migration of oxidizing and reducing fluids,and constrain the post geochemical environment.The control of"mud-sand-mud"structure by phase and sub-facies create favorable storage space for uranium.The different levels of sequence stratigraphy of Late Cretaceous in southern Songliao Basin comprehensively constrain uranium mineralization from different perspectives and play a crucial role in the entire uranium mineralization process.关键词
层序地层/砂岩型铀矿/成矿作用/松辽盆地南部Key words
sequence stratigraphy/sandstone type uranium deposits/mineralization process/southern Songliao Basin分类
天文与地球科学引用本文复制引用
刘鑫,王常东,蔡建芳,姜山,宁君,卜艳乾,何乐昌,郭恒飞..松辽盆地南部层序地层特征及其对铀成矿的制约作用分析[J].铀矿地质,2025,41(5):757-772,16.基金项目
中国核工业地质局项目"内蒙古科左中旗代力吉—吉林省通榆县鸿兴地区铀矿资源调查评价"(编号:202212-5)资助. （编号:202212-5）
