| 论砂岩型铀矿床中黄铁矿对铀成矿的作用 |
| Received:May 06, 2025 Revised:December 29, 2025 点此下载全文 |
| 引用本文：ZHANG ZiLong,WANG FengGang,HE Feng,NIU Ting,LUO SenSen,ZHANG Yan,LUO Teng.2026.Viewpoint on the role of pyrite in uranium mineralization in sandstone type uranium deposits[J].Mineral Deposits,45(1):178~188 |
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| Author Name | Affiliation | | ZHANG ZiLong | Beijing Research Institute of Uranium Geology, Beijing 100029, China
National Key Laboratory of Uranium Resources Exploration-mining and Nuclear Remote Sensing, Beijing 100029, China
Key Laboratory of Uranium Resource Exploration and Evaluation Technology, CNNC, Beijing 100029, China | | WANG FengGang | Beijing Research Institute of Uranium Geology, Beijing 100029, China
National Key Laboratory of Uranium Resources Exploration-mining and Nuclear Remote Sensing, Beijing 100029, China
Key Laboratory of Uranium Resource Exploration and Evaluation Technology, CNNC, Beijing 100029, China | | HE Feng | Beijing Research Institute of Uranium Geology, Beijing 100029, China
National Key Laboratory of Uranium Resources Exploration-mining and Nuclear Remote Sensing, Beijing 100029, China
Key Laboratory of Uranium Resource Exploration and Evaluation Technology, CNNC, Beijing 100029, China | | NIU Ting | CNNC No. 203 Institute, Xi'an 710086, Shaanxi, China | | LUO SenSen | CNNC No. 203 Institute, Xi'an 710086, Shaanxi, China | | ZHANG Yan | Beijing Research Institute of Uranium Geology, Beijing 100029, China
National Key Laboratory of Uranium Resources Exploration-mining and Nuclear Remote Sensing, Beijing 100029, China
Key Laboratory of Uranium Resource Exploration and Evaluation Technology, CNNC, Beijing 100029, China | | LUO Teng | Beijing Research Institute of Uranium Geology, Beijing 100029, China
National Key Laboratory of Uranium Resources Exploration-mining and Nuclear Remote Sensing, Beijing 100029, China
Key Laboratory of Uranium Resource Exploration and Evaluation Technology, CNNC, Beijing 100029, China |
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| 基金项目:核技术研发项目(编号:地H2501)资助 |
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| 中文摘要:文章通过系统的野外地质露头及钻孔岩芯观察、显微镜及扫描电镜研究，结合前人研究成果，深入探讨了砂岩型铀矿床中黄铁矿与铀成矿的空间赋存关系及成因。研究结果表明：砂岩中黄铁矿普遍发育，但其与铀矿物的空间分布多呈非相关性；在二者紧密共伴生的情况下，主要存在3种赋存形式共存，其铀成矿作用机理也有明显差异：（1）铀矿物环绕黄铁矿呈环带状分布，主要是成矿过程中Eh值降低或酸化环境使得黄铁矿优先于铀沉淀所致；（2）铀矿物赋存于黄铁矿溶蚀孔洞、裂隙或莓球状表面，与黄铁矿微纳米级孔隙结构的吸附作用密切相关；（3）少量铀矿物直接富集于黄铁矿表面，系厌氧弱酸-弱碱条件下黄铁矿水解释放的H2S还原铀酰离子所致。因此，黄铁矿只是砂岩型铀成矿体系中的一种辅助还原介质和成矿介质。相较于油气、煤层气、炭屑、钛铁氧化物及黏土矿物等高效还原剂和成矿介质，黄铁矿在铀成矿过程中的贡献相对有限，仅起较小作用。 |
| 中文关键词:黄铁矿 铀矿物 赋存关系 成矿作用 砂岩型铀矿 |
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| Viewpoint on the role of pyrite in uranium mineralization in sandstone type uranium deposits |
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| Abstract:This article deeply explores the spatial occurrence relationship and genesis of pyrite and uranium mineralization in sandstone type uranium deposits through systematic macroscopic observation of field geological outcrops and drilling cores, and microscopic research with microscope and scanning electron microscope, combined with previous research results. The research results indicate that pyrite is widely developed in sandstone, but its spatial distribution is mostly unassociated with uranium minerals. In the case of close coexistence between the two, there are mainly three types of coexistence forms with evident different uranium metallization mechanism:（1） Uranium minerals are distributed in a ring-like pattern around pyrite, mainly due to the decrease in Ehvalue or acidification environment during the mineralization process, which leads to the earlier precipitation of pyrite than uranium.（2） Uranium minerals occur in the dissolution pores, fissures, or on the surface of pyrite, and are closely related to the adsorption of micro and nano scale pore structures of pyrite.（3） A small amount of uranium minerals are directly enriched on the surface of pyrite, which is caused by the reduction of uranyl ions by H2S released from the hydrolysis of pyrite under anaerobic weak acid to weak alkali conditions. Therefore, pyrite is only an auxiliary reducing medium and ore-forming medium in sandstone type uranium mineralization systems. Compared to efficient reducing agents and ore-forming media such as oil and gas, coalbed methane, organic carbon debris, Ti-Fe oxides, and clay minerals, the contribution of pyrite in uranium mineralization is relatively limited and only plays a secondary role. |
| keywords:pyrite uranium minerals occurrence relationships mineralization processes sandstone type uranium deposits |
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