铀矿地质2024，Vol.40Issue(1)：41-56,16.DOI:10.3969/j.issn.1000-0658.2024.40.004
鄂尔多斯盆地西南部下白垩统铀矿化砂岩中有机质特征及其与铀成矿的关系
Characteristics of Organic Matter in Lower Cretaceous Ore-bearing Sandstone and Its Relationship With Uranium Mineralization in Southwestern Ordos Basin
摘要
Abstract
In recent years,a great breakthrough has been made in the uranium prospecting in the Lower Cretaceous in southwestern Ordos Basin.New uranium deposits have been discovered in some districts of Zhenyuan and Pengyang county.The uranium mineralization in Cretaceous sandstones mainly occurs in the Luohe and Huanhe Formations,a few uranium mineralization occurs in the Jingchuan Formation and Luohandong Formation.The primary sediments of these ore-bearing strata are all formed in arid environment,and lack of visible organic matter.However,the mineralization rocks are rich in disseminated organic matter in the drill cores,but few systematic study was reported on the properties of disseminated organic matter and its relationship with uranium mineralization.In this paper,the types of organic matter in the uranium-bearing sandstone was found determined based on the core observations and laboratory study.The results show that the organic matter from the original sediments in the U-bearing sandstone is very rare,and the organic matter is mainly the macromolecular organic matter filled in the micro-pores of the sandstone with the characteristics of flow and low evolution degree,the source rock of 7th member of Yanchang Formation may be the main source rock.The uranium mineralization is not related to the organic matter as solid carbon debris,but mainly to the"soluble"and"flowing"organic matter.The characteristics of Cretaceous uranium mineralization in the study area are correspond to the exudative uranium metallogeny of sandstone type U-mineralization.关键词
流动状有机质/风成砂/下白垩统/砂岩型铀矿/鄂尔多斯盆地Key words
mobile organic matter/aeolian sandstone/Lower Cretaceous/sandstone-type uranium deposit/Ordos Basin分类
天文与地球科学引用本文复制引用
邱林飞,李子颖,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铀矿化砂岩中有机质特征及其与铀成矿的关系[J].铀矿地质,2024,40(1):41-56,16.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）
国家重点基金项目(编号:U2167210) （编号:U2167210）
中核集团青年英才项目(编号:地QNYC2301) （编号:地QNYC2301）
中国核工业地质局地勘费项目(编号:202115-2)联合资助. （编号:202115-2）
