硫同位素非质量分馏的发现，使我们对含硫地质体相互作用和演化过程的理解有了革命性的变化，也对硫同位素的分析提出了更高的要求。离子探针以高空间分辨力及高灵敏度的特点，成为微区原位高精度分析的首选方法。近年来，离子探针硫同位素分析大多局限在丰度相对较高的三个同位素32S，33S 和34S 的测量，而丰度最低的36S （约0.02%）作为非质量分馏的另一个重要指示剂，目前尚不能实现离子探针精确测量。本项目拟利用双聚焦多接收离子探针 Cameca IMS-1280，以黄铁矿为主要研究对象，通过升级多接收器法拉第杯信号放大器、优化仪器配置等措施，尝试36S测量精确测定，从而实现32S、33S、34S 和36S 的同时精确测量，建立完善的高精度、高效率微区原位硫同位素分析方法，为成矿作用、大气演化等诸多科学问题的研究提供重要工具。

The discovery of mass independent fractionation effects (MIF) in sulfur isotopes has revolutionized our understanding of evolution and interaction of sulfur reservoirs. At the same time, a higher requirement for sulfur isotope analysis has been raised. Among the various methods available to measure sulfur isotopes, secondary ion mass spectrometry (SIMS) or Ion probe, which combines high-spatial resolution with excellent sensitivity, has been chosen as the preferred solution. To date, SIMS studies on sulfur isotopes have been limited to the three most abundant isotopes, 32S, 33S and 34S. The least abundant isotope of sulfur, 36S (ca. 0.02%), as one of the most important tracers of MIF, can't be measured precisely by SIMS because of multiple difficulties. A rapid and precise method for measuring the quadruple sulfur isotope, 32S, 33S, 34S and 36S, in pyrite will be established. By upgrading the pre-amplifiers of the Faraday cups and optimizing instrument configurations in the project, all the four isotopes will be measured at the same time by multi-collector system on a double focusing Cameca IMS-1280 SIMS. This study will provide important tools for the study of the ore-forming processes, the atmospheric evolution, and many other scientific problems.