铀矿地质2024，Vol.40Issue(1)：57-70,14.DOI:10.3969/j.issn.1000-0658.2024.40.005
鄂尔多斯盆地西南部下白垩统赋矿砂岩中有机质地球化学特征及其来源
Geochemical Characteristics and Organic Matter Source in the Lower Cretaceous U-bearing Sandstones in Southwestern Ordos Basin
摘要
Abstract
Sandstone-type uranium deposits are the most important uranium deposit type in China and are commonly associated with organic energy resource.Ordos Basin is one of the typical basins where organic and inorganic resources coexist.In recent years,new uranium mineralization has been discovered in the Lower Cretaceous Huanhe and Luohe Formation in Zhenyuan area,in the southern part of the basin,which is closely related to organic matter.To determine the nature and source of organic matter in mineralized sandstones and explore its relationship with uranium mineralization processes,organic petrological and organic geochemical analyses were conducted on typical samples.The results indicates that the organic matter in the ore-bearing sandstones was predominantly"mobile or disseminated organic matter".The characteristics of biomarkers indicated that organic matter was relatively low mature,formed in a reductive low-salinity lacustrine environment,and its bio-precursors were dominated by lower aquatic organisms.Oil-source correlation analysis revealed that the organic matter was originated from the highly prolific lacustrine source rocks of the 7th member of the Yanchang Formation(Chang-7 member).关键词
有机质/生物标志物/下白垩统/砂岩型铀矿/鄂尔多斯盆地Key words
organic matter/biomarkers/Lower Cretaceous/sandstone-type uranium deposits/Ordos Basin分类
天文与地球科学引用本文复制引用
王婷婷,邱林飞,贺锋,武正乾,刘坤鹏,毛宁,李孟华..鄂尔多斯盆地西南部下白垩统赋矿砂岩中有机质地球化学特征及其来源[J].铀矿地质,2024,40(1):57-70,14.基金项目
中核集团集中研发项目(编号:中核科发2021-143号) （编号:中核科发2021-143号）
中国核工业地质局地勘费项目(编号:202115-2) （编号:202115-2）
东华理工大学研究生创新基金项目(编号:DHYC-202311)联合资助. （编号:DHYC-202311）
