世界核地质科学2026，Vol.43Issue(2)：199-214,16.DOI:10.3969/j.issn.1672-0636.2026.02.001
银额盆地中新生代断陷湖盆中原生红色沉积与后生红色改造的区分标志与分布规律
Distinguishing criteria and distribution patterns of original red sedimentation and epiginetic red alteration in the Mesozoic-Cenozoic faulted down Yingen-Ejin basin
摘要
Abstract
Numerous investigations and studies have indicated that the mineralization of sandstone-type uranium deposits is associated with the epigenetic transformation of ore-bearing sandstones.However,in the red variegated formations,the types and identification of epigenetic transformations become complex.Distinguishing between original sedimentary red sandstones and red sandstones formed by epigenetic oxidation has always been a challenge in field surveys and exploration.This paper focuses on the genetic differentiation markers of different types of red variegated geological bodies.selects the Mesozoic-Cenozoic Yingen-Ejin basin through outcrop observations,borehole core observations,and logging,combined with laboratory analysis.The results show that the formation and distribution of original red variegated layers are closely related to the depositional environment,mainly controlled by paleoclimate and paleowater depth variations.In a semi-arid to arid climate context,the color of sediments is controlled by paleowater depth,forming alluvial fans,fan deltas,and semi-deep lacustrine deposits from the basin margin inward.As the paleowater depth of deposition increases,the color of sediments gradually changes from red and red variegated to gray.Original red formations are dominated by dark red,brown,and purplish red,with a high content of matrix and developed hematitization but rarely limonitization.Original gray sandstones undergo later oxidation,marked by red with yellow,developed disseminated hematite and limonite,and clayization.The re-oxidation of original red sandstones is characterized by partial dissolution of clastic particles and weak clayization,with the main identification feature being a lighter red color.This study significantly promotes the identification of epigenetic oxidation transformations in red variegated formations and has important implications for the exploration of sandstone-type uranium deposits in these formations.关键词
砂岩型铀矿/红杂色建造/原生红层/后生氧化/银额盆地Key words
sandstone-type uranium deposit/red-gray mixed sedimentary formation/primary red beds/epigenetic oxidation/Yingen-Ejin basin分类
天文与地球科学引用本文复制引用
张成勇,秦彦伟,邱林飞,刘旭,李鹏,李海啸,傅钰坤..银额盆地中新生代断陷湖盆中原生红色沉积与后生红色改造的区分标志与分布规律[J].世界核地质科学,2026,43(2):199-214,16.基金项目
铀资源探采与核遥感全国重点实验室基金项目(编号:NKLUR-2024-YB-004),国家自然科学基金项目(编号:42272097)、中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金项目(编号:2023NRE-LH-05)和天然铀产业技术创新联合体"揭榜挂帅"项目(编号:202301)联合资助 Supported jointly by the National Key Laboratory of Uranium Resource Exploration and Nuclear Remote Sensing(No.NKLUR-2024-YB-004),the National Natural Science Foundation of China(Grant No.42272097),the Joint Innovation Fund Project between the State Key Laboratory of Nuclear Resources and Environment at East China University of Technology and China National Uranium Co.,Ltd.(No.2023NRE-LH-05),and the Natural Uranium Industry Technology Innovation Consortium"Unveiling and Commanding"Project(No.202301) （编号:NKLUR-2024-YB-004）
