硫化物中硫同位素分馏理论计算研究进展

Advances in the theoretical calculation research of sulfur isotope fractionation in sulfides

硫化物是重要的矿物类,通常是一个或多个金属元素与硫结合而形成硫化物。硫化物作为大多数金属的主要来源具有重大的经济利用价值,硫化物中硫同位素分馏的研究一直是同位素地球化学研究的热点。研究不同金属硫化物之间的硫同位素分馏效应,对于利用硫同位素对成矿作用过程和成矿物质来源开展地球化学示踪,具有非常重要的意义。本文结合笔者近期的工作概述了硫化物中硫同位素分馏的理论计算研究,认为虽然半经验半理论的增量方法在同位素分馏计算中存在一定的局限性,但在没有其他实用的理论计算方法时,改进的增量方法可以作为硫化物中硫同位素分馏计算的一种理论估算方法。

As an important group of minerals, sulfides, formed by the combination of one or more metals with sulfur, have great economic importance as a major source of most metals, and the research on sulfur isotope fractionations in sulfides constitutes a focus of discussion in the stable isotope geochemical field. Being an important geochemical tracer, the sulfur isotope fractionation in sulfides can be used to analyze the ore-forming process and the ore-forming material source. Based on the authors＇ up-to-date research, this paper dealt with the theoretical calculation of sulfur isotope fractionation in sulfides and has reached the conclusion that at present the improved method can be used to approximately calculate the thermodynamic isotope fractionation factors of sulfur in sulfides of geochemical interest.