沉积与特提斯地质2025，Vol.45Issue(3)：544-560,17.DOI:10.19826/j.cnki.1009-3850.2025.08001
柴达木盆地北缘东部中侏罗统大煤沟组沉积相及其与铀矿化关系研究
Sedimentary facies and uranium mineralization of the Middle Jurassic Dameigou Formation in the eastern part of the northern Qaidam Basin
摘要
Abstract
This study examines the sedimentary facies of the Middle Jurassic Dameigou Formation and their relation with uranium mineralization,providing a basis for the exploration of sandstone-type uranium deposits in the eastern margin of the Qaidam Basin.Surface profile observation and drilling analysis reveal a fan-delta-lacustrine depositional system,with he fan delta developing in the northeastern flank of the Beidatan syncline and lacustrine deposits occupying the southwestern flank of the syncline and the central depression.The fan delta shows a vertical succession of fan-delta plain,fan-delta front,and fan-prodelta,with characteristics of near provenance,large slope,and rapid accumulation,showing a retrogradation sequence and deepening lake conditions.Microfacies identified include distributary channel(gravelly distributary channel),floodplain swamp,underwater distributary channels,interdistributary bays,sheet sands,and fan-prodelta mud,with the lacustrine facies comprising littoral swamps,sand bars,shallow lake muds,and semi-deep to deep lake muds microfacies.Uranium mineralization mainly occurs in the underwater distributary channels of the fan-delta front,where sand bodies develop and have a mud-sand-mud stratigraphic structure.In the humid paleoclimate environment,the sand bodies are enriched in organic matter and carbon debris,and are conducive to uranium mineralization,indicating that these sand bodies of distributary channels microfacies should be priority targets for investigation.关键词
柴达木盆地北缘东部/北大滩地区/砂岩型铀矿/扇三角洲/沉积相Key words
eastern part of the northern Qaidam Basin/Beidatan area/sandstone-type uranium deposit/fan delta/sedimentary facies分类
天文与地球科学引用本文复制引用
刘明,朱小兵,黄宏业,田亚铭,陈琪,郭业达..柴达木盆地北缘东部中侏罗统大煤沟组沉积相及其与铀矿化关系研究[J].沉积与特提斯地质,2025,45(3):544-560,17.基金项目
中国核工业地质局地勘项目(202018-2,202222) （202018-2,202222）
