铀矿地质2025，Vol.41Issue(6)：1069-1082,14.DOI:10.3969/j.issn.1000-0658.2025.41.074
库车坳陷库车组砂岩铀成矿水文地球化学特征初步研究
Preliminary Study on Hydrogeochemical Characteristics of Sandstone Uranium Mineralization in the Kuche Formation,Kuche Depression
摘要
Abstract
The Kuqa depression,as a favorable area for uranium exploration in the northern margin of the Tarim basin,is believed with top uranium resource potential in China,the understanding of hydrogeochemical characteristics is critical for the sandstone uranium mineralization within this region.This paper,based on geological background and hydrogeological surveys,monitored groundwater chemical composition data in sandstones.Using hydrogeochemical modeling methods,calculations were performed on the hydrogeochemical conditions for uranium mineralization in the Kuqa formation.The research results indicate that groundwater in the Kuqa formation is weakly alkaline(pH values ranging from 6.84 to 8.95)and in a weakly reducing environment(Eh values ranging from-32 to-5 mV),with the dominant hydrochemical type being Cl-Na.Groundwater in the sandstone was found originated from atmospheric precipitation recharge,with a 14C corrected age ranging from 13,398 to 31,978 years,uranium primarily exists in the form of UO2(CO3)34-(accounting for 47.30%to 96.87%),and the dissolution-precipitation of pitchblend is controlled by uranium concentration and redox potential(Eh value).Increases in uranium concentration or decreases in Eh value both favor uranium precipitation and mineralization.Furthermore,the modeling results quantified the boundary conditions for uranium concentration and Eh value in groundwater,defining the characteristics and conditions of uranium mineral dissolution-precipitation in the regional groundwater.These findings provide significant hydrogeochemical evidence for sandstone-type uranium exploration in the Kuqa depression and hold important guiding significance for delineating favorable uranium mineralization zones and improving prospecting efficiency.关键词
铀成矿/水文地球化学/砂岩型铀矿/PHREEQC模拟Key words
uranium mineralization/hydrogeochemistry/sandstone-type uranium deposit/PHREEQC simulation分类
地质学引用本文复制引用
杨涵,刘金辉,曹俊,王强强,李书海,陈瑞,任满船..库车坳陷库车组砂岩铀成矿水文地球化学特征初步研究[J].铀矿地质,2025,41(6):1069-1082,14.基金项目
中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金项目(编号:2023NRE-LH-09)资助. （编号:2023NRE-LH-09）
