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拐子湖坳陷为银额盆地铀成矿潜力突出的大型二级构造单元，开展地下水铀溶解-沉淀水文地球化学特征研究，对砂岩型铀成矿远景区圈定与找矿预测具有重要意义。系统揭示拐子湖坳陷苏红图组成矿期与近代地下水的铀溶解-沉淀规律，定量厘定其成矿水文地球化学边界条件。以野外地质-水文地质调查与样品采集为基础，采用水-岩体系浸泡试验与PHREEQC水文地球化学模拟，定量刻画铀溶解-沉淀特征。研究区近代地下水pH介于7.7～10.5之间、 Eh介于-100～136 mV之间，铀含量介于0.05～12.16μg·L-1之间；成矿期古地下水pH介于5.85～9.63之间、Eh介于-250～92 mV之间，铀含量介于0.02～0.616 mg·L-1之间。苏红图组近代地下水沥青铀矿沉淀Eh临界值介于-214.2～-41.83 mV之间，铀浓度临界值介于1.52～2 241 mg·L-1之间；成矿期铀溶解-沉淀Eh临界值介于-95.50～167.29 mV之间、铀浓度临界值介于0.1～463.37μg·L-1之间。YESY-120采样点靠近铀沉淀临界条件；ZKC9剖面孔深介于450～550 m之间段具备优越的砂岩型铀成矿水文地球化学环境。以上认识可以为铀溶解沉淀的定量判别提供科学依据，对该区铀成矿远景区预测具有重要的现实意义。
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 oreforming 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.
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基本信息:
中图分类号:P641.3;P619.14
引用信息:
[1]廖宏亮,刘金辉,刘武生,等.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(04):749-761.
基金信息:
核技术研发项目（编号：地H2401）资助~~
2026-05-28
2026-05-28
2026-05-28