进一步研究发现，黄金纳米颗粒并非在溶液中凭空产生，而是在紧贴黄铁矿表面的"致密液体层"中诞 生。"这层液体犹如'纳米工厂'，黄铁矿溶解会显著降低层内的氧逸度，从而改变局部化学环境，促使 金离子迅速达到过饱和并沉淀为固体颗粒。"鲜海洋介绍，即使外部溶液中金浓度极低，该机制仍能持 续驱动金向界面迁移并实现富集沉淀。该机制同时适用于热液型金矿床和表生金富集过程。 该研究挑战了"金主要源自深部热液流体"的传统观点，不仅为理解热液型金矿床和表生环境中金的超常 富集提供了微观动力学观察，还为阐释自然界中纳米颗粒驱动的矿化过程开辟了新路径。同时，这项研 究对绿色浸金工艺中的界面调控具有重要指导意义。 据《科技日报》 黄铁矿诱导金沉淀是形成高品位金矿的关键环节，但其界面动态机制尚不明确。以往研究多依赖反应后 的离线分析，既无法捕捉金沉淀的瞬时过程，也难以深入阐明其形成机制。 研究团队通过原位液相透射电子显微镜等多尺度、多手段联用技术，实时观测了黄铁矿与浓度为10ppb （即十亿分之十）的极低浓度含金溶液的反应过程。 "当两者接触约13分钟后，黄铁矿周围形成'致密液体层'。约20分钟后，该层内开始出现黄金纳米颗 粒，并随时间推 ...

Core Insights - A research team led by researchers from the Guangzhou Institute of Geochemistry of the Chinese Academy of Sciences has utilized in-situ liquid-phase transmission electron microscopy to observe the dynamic process of gold nanoparticle formation on the surface of pyrite in a liquid environment for the first time [1][2] - The study proposes a new mechanism for gold precipitation induced by pyrite, revealing the presence of a special "dense liquid layer" at the pyrite-water interface, which acts as a "nano-factory" to catalyze the nucleation, growth, and enrichment of gold in extremely low concentration gold-bearing fluids [1][2] Research Findings - The research indicates that gold nanoparticles do not form spontaneously in the solution but are generated within the "dense liquid layer" closely adhering to the pyrite surface [2] - The dissolution of pyrite significantly reduces the oxygen fugacity within this layer, altering the local chemical environment and facilitating the rapid supersaturation of gold ions, leading to their precipitation as solid particles [2] - This mechanism can drive the migration and enrichment of gold at the interface even when the external solution has an extremely low gold concentration, challenging the traditional view that gold primarily originates from deep hydrothermal fluids [2] Implications - The findings provide new insights into the micro-dynamics of gold enrichment in both hydrothermal gold deposits and surface gold accumulation processes, opening new pathways for understanding mineralization processes driven by nanoparticles in nature [2] - The research also holds significant implications for interface regulation in green gold leaching processes [2]

Group 1 - Chinese scientists have utilized in-situ liquid-phase transmission electron microscopy to observe the dynamic process of gold nanoparticles forming on the surface of pyrite in real-time, proposing a new mechanism for gold precipitation induced by pyrite [1][3] - The research team, led by researchers Zhu Jianxi and Xian Haiyang from the Guangzhou Institute of Geochemistry, observed the reaction process with a gold solution concentration of 10 ppb, revealing that a "dense liquid layer" forms around the pyrite after approximately 13 minutes of contact [3] - Gold nanoparticles begin to appear within this dense liquid layer around 20 minutes after contact, indicating that the mechanism can drive gold migration and accumulation even at extremely low concentrations in the external solution [3][4] Group 2 - The mechanism discovered is applicable to both hydrothermal gold deposits and surface gold enrichment processes, highlighting its significance in understanding gold formation [4]

Core Viewpoint - The research team from the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, has utilized in-situ liquid-phase transmission electron microscopy to reveal the dynamic process of gold nanoparticle formation on the surface of pyrite, proposing a new mechanism for gold precipitation induced by pyrite [1] Group 1: Research Findings - A special "dense liquid layer" exists at the pyrite-water interface, acting as a "nano-factory" that effectively catalyzes the nucleation, growth, and enrichment of gold even in fluids with extremely low gold concentrations (only a few billionths) [1] - The study provides a new perspective for understanding the genesis of gold deposits [1] Group 2: Publication Details - The related findings were published on January 20 in the international academic journal Proceedings of the National Academy of Sciences [1]