一、前言钠交代这一现象早已为世人所知,但是,它在铀成矿中究竟具有何等作用?呈现什么特征?却是一个较新颖而值得探讨的问题。近年来,许多国家的铀矿床中,均发现有强烈的钠交代作用,引起人们广泛的兴趣。我们在多年的铀矿普查找矿中,由于发现和认识了钠交代现象,帮助我们正确地评价了一些矿点,因此,找到了矿床。所以,深入地研究钠交代作用,有着非常重要的实际意义。 I. INTRODUCTION The phenomenon of sodium dating has long been known to the world, but what exactly does it play in uranium mineralization? What are the characteristics? It is a relatively new and worthwhile question. In recent years, many uranium deposits in many countries have found a strong sodium metasomatism, arousing widespread interest. In our many years of prospecting for uranium deposits, we found some deposits due to the discovery and understanding of sodium metasomatism, which helped us to correctly evaluate some of the ore deposits. Therefore, in-depth study of sodium metasomatism has a very important practical significance.