华北地质2025，Vol.48Issue(4)：54-62,9.DOI:10.19948/j.12-1471/P.2025.04.05
沁水盆地西南部上古生界砂岩型铀矿关键控矿因素
Key ore-controlling factors of upper Paleozoic sandstone-type uranium deposits in the southwestern Qinshui Basin
摘要
Abstract
[Objective]Industrial sandstone-type uranium mineralization has been discovered in the Upper Permian of the southwestern Qinshui Basin.This stratigraphic horizon is among the oldest industrial uranium-bearing rock sequences in China,boasting significant exploration potential.[Methods]Through core observation,sedimentological mapping,scanning electron microscopy(SEM)analysis,and other experimental testing methods,the occurrence characteristics,distribution patterns,and key controlling factors of uranium mineralization have been investigated.[Results]The uranium mineralization occurs in gray to dark gray fine-grained sandstones of the Lower Member of the Upper Permian Shiqianfeng Formation.The cumulative thickness of mineralized sandbodies reaches a maximum of 7.85 meters,with the highest uranium grade of 0.0275％.Planar distribution of uranium orebodies is predominantly in an isolated island-like pattern,and the main uranium mineral types are uraninite and pitchblende.Uranium minerals are frequently found associated with quartz,feldspar,clay minerals,and pyrite.Uranium mineralization is primarily controlled by the distribution of uranium reservoirs,reducing geological bodies,and interlayer oxidation zones.[Conclusions]It is mainly distributed in areas with the following characteristics:sandbody thickness ranging from 20 to 60 meters,sand content between 30％and 60％,sandbody bifurcation and thinning zones,mudstone thickness of 40 to 80 meters,and transition zones within interlayer oxidation zones.The research results provide insights into regional uranium mineralization processes and point out the direction for further uranium exploration.关键词
沁水盆地/二叠系/砂岩型铀矿/控矿因素/找矿标志Key words
Qinshui Basin/Permian/sandstone-type uranium deposit/ore-controlling factors/prospecting criteria分类
天文与地球科学引用本文复制引用
侯泽敏,张浩然,胡晓兵,荣辉,薄鹏毅,张继强,田保安,胡鑫,邢作昌,郭家彤..沁水盆地西南部上古生界砂岩型铀矿关键控矿因素[J].华北地质,2025,48(4):54-62,9.基金项目
山西省地质勘查局省级地质勘查建设与发展专项资金项目"山西省沁水盆地西南缘砂岩型铀成矿地质条件与有利目标区优选"(1499002024CGK02736) Special Fund Project for Provincial Geological Survey Construction and Development of Shanxi Geological Survey Bureau,Geological Conditions of Sandstone-type Uranium Mineralization and Optimization of Favorable Target Areas in the Southwestern Margin of Qinshui Basin,Shanxi Province(No.1499002024CGK02736) （1499002024CGK02736）
