鄂尔多斯盆地北部砂岩铀矿床铀矿物赋存形式及形成机理研究  

Occurrence and formation mechanism of U minerals in sandstone-hosted U deposit in North Ordos basin

作　　者：李华明 李玲 LI Huaming;LI Ling(No.208 Geological Party CNNC,Baokou 014010,Inner Mongolia,China)

机构地区：[1]核工业二〇八大队,内蒙古包头014010

出　　处：《地质找矿论丛》2025年第1期33-44,共12页Contributions to Geology and Mineral Resources Research

基　　金：中国核工业地质局地勘费项目(202401-9)资助。

摘　　要：对鄂尔多斯盆地北部铀成矿带产铀层位中侏罗统直罗组赋矿砂岩进行系统采样和分析,以探讨赋矿砂岩中铀矿物的存在形式及成因机制。采用电子探针化学成分分析和扫描电镜镜下观察等分析手段,对铀的赋存状态、铀矿物的产出特征进行了系统研究。结果表明:研究区铀的存在形式主要有吸附铀及铀矿物,铀矿物以铀石为主。铀矿物的产出特征包括赋存在碎屑颗粒内部以碎屑铀矿物的形式产出、以单个颗粒或集合体的形式产出、以似胶状形式产出等3种。研究区铀矿物与黏土矿物、黄铁矿及有机碳屑存在着较密切的伴生关系,在铀矿物的形成过程中,黏土矿物主要起到了通过蚀变演化改变环境从而影响铀成矿的作用。Samples are systematically collected from U ore-hosted Middle Jurassic Zhiluo formation.Chemical analysis,electronic probe analysis and scanning electron microscopic observation were conducted on the samples to explore occurrence and formation mechanism of the U and U minerals.The result shows that absorption is the main occurrence of U,U minerals dominated by coffinite occurs in single detrital mineral,assemblage and colloidal mineral.U minerals in the study area are closely companied by clay mineral,pyrite and organic carbon debris.During formation of U minerals clay minerals which play role in alteration and change environment and influence metallogenic process of the U deposit.

关 键 词：砂岩型铀矿床 铀矿物 成因机理 鄂尔多斯盆地 

分 类 号：P619.14[天文地球—矿床学]