世界核地质科学2025，Vol.42Issue(6)：1195-1209,15.DOI:10.3969/j.issn.1672-0636.2025.06.005
银额盆地塔木素矿床有机质特征及其对成矿过程的启示
Characteristics of organic matter in the Tamusu deposit of the Yingen-Ejin basin and its implications for the mineralization process
摘要
Abstract
The Tamusu uranium deposit is a recently discovered super-large uranium deposit in the Yingen-Ejin basin,characterized by complex metallogenesis,with the role of organic matter in the mineralization process remaining unclear.This study focuses on the organic matter within the ore-bearing sandstones,employing integrated organic petrography,spectroscopy,and geochemistry to determine the types,properties,sources of organic matter,and their role in uranium mineralization.Results indicate that the organic matter comprises two main types:syngenetic solid carbonaceous debris and later-stage mobile"soluble"organic matter.The carbonaceous debris originated from terrigenous higher plants during the deposition of the Early Cretaceous Bayingebi formation.In contrast,the soluble organic matter was primarily derived from lower aquatic organisms(e.g.algae),formed in a saline,strongly reducing lacustrine to paralic environment,and has reached a mature evolutionary stage,having undergone significant biodegradation.Soluble organic fluids originated from deep source rocks beneath ore-bearing strata.Microscale evidence,such as the coexistence of pyrite,carbonaceous material(soluble organic matter),and carbonate minerals within fluid inclusions in quartz grains,along with observed organic matter-clay-uraninite micro-composites,provides direct evidence for the co-migration of soluble organic matter and metallogenic components.Organic matter played multiple crucial roles in the mineralization process:acting as a"source",a"reducing agent",a"transport medium",and a"barrier".关键词
银额盆地/塔木素铀矿床/有机质/生物标志化合物/成矿作用Key words
Yingen-Ejin basin/Tamusu uranium deposit/organic matter/biomarkers/mineralization分类
天文与地球科学引用本文复制引用
WANG Tingting,QIU Linfei,LIU Bo,QIN Yanwei,HAN Meizhi,LONG Min..银额盆地塔木素矿床有机质特征及其对成矿过程的启示[J].世界核地质科学,2025,42(6):1195-1209,15.基金项目
国家自然科学基金(编号:42302180),中国核工业地质局地勘费项目(编号:202446-2)和天然铀产业技术创新联合体"揭榜挂帅"(编号:202301)联合资助 Supported jointly by National Natural Science Foundation of China(No.42302180),Geological Exploration Project of China Nuclear Geology(No.202446-2)and"Challenge and Response"Project of the Innovation Consortium for the Natural Uranium Industry Technology(No.202301). （编号:42302180）
