世界核地质科学2026，Vol.43Issue(4)：749-761,13.DOI:10.3969/j.issn.1672-0636.2026.04.009
银额盆地拐子湖坳陷苏红图组地下水铀溶解-沉淀水文地球化学特征
Hydrogeochemical characteristics of uranium dissolution-precipitation in groundwater of Suhongtu formation in Guaizihu depression,Yingen-Ejin basin
摘要
Abstract
The Guaizihu depression is a major secondary structural unit with prominent uranium metallogenic potential in the Yingen-Ejin basin.This study investigated hydrogeochemical characteristics of uranium dissolution and precipitation in groundwater.This paper systematically revealed the laws of uranium dissolution and precipitation in both ore-forming period paleo-groundwater and modern groundwater of the Suhongtu Formation in the Guaizihu depression,and quantitatively defines the hydrogeochemical boundary conditions for uranium mineralization.Based on field geological and hydrogeological surveys as well as sample collection,with water-rock interaction leaching tests and PHREEQC hydrogeochemical simulation,we quantitatively characterize the features of uranium dissolution and precipitation.In the study area,modern groundwater shows a pH range of 7.7～10.5,an Eh range of-100～136 mV,and uranium content of 0.05～12.16 μg·L-1.Paleo-groundwater during the ore-forming period had a pH range of 5.85～9.63,an Eh range of-250～92 mV,and uranium content of 0.02～0.616 mg·L-1.For modern groundwater of the Suhongtu Formation,the critical Eh values for pitchblende precipitation are-214.2～-41.83 mV,and the critical uranium concentrations are 1.52～2 241 mg·L-1.During the ore-forming period,the critical Eh values for uranium dissolution and precipitation were-95.50～167.29 mV,and the critical uranium concentrations were 0.1～463.37 μg·L-1.The sampling site YESY-120 is close to the critical conditions for uranium precipitation.The depth interval of 450～550 m in section ZKC9 presents favorable hydrogeochemical conditions for sandstone-type uranium mineralization.The above findings supply scientific references for quantitative discrimination of uranium dissolution and precipitation.It provides key support for delineating prospective areas and conducting prospecting prediction of sandstone-type uranium deposits.关键词
拐子湖坳陷/地下水/水文地球化学/PHREEQC模拟Key words
Guaizihu depression/groundwater/hydrogeochemistry/PHREEQC simulation分类
天文与地球科学引用本文复制引用
廖宏亮,刘金辉,刘武生,秦彦伟,门宏,贾立城..银额盆地拐子湖坳陷苏红图组地下水铀溶解-沉淀水文地球化学特征[J].世界核地质科学,2026,43(4):749-761,13.基金项目
核技术研发项目(编号:地H2401)资助 Supported by the Scientific Research Project of Nuclear Technology R&D(No.地 H2401) （编号:地H2401）
