锇同位素组成已经成为地幔地球化学研究的重要手段之一。地幔中绝大部分的贵金属元素主要是由地幔硫化物控制，由于地幔橄榄岩通常同时保存着多期次和多种赋存形式的硫化物，因此全岩锇同位素组成可能只是这些不同成因硫化物的混合结果。如果想获得不同期次的硫化物各自的锇同位素组成，便需要原位锇同位素测试技术来提供地质意义明确的数据。目前国内外能开展硫化物LA-MC-ICP-MS原位锇同位素测试的实验室极其有限，这也导致相应的地学研究工作无法大规模开展。现有测试技术在标准物质、校正策略及灵敏度这三个方面存在较大改进空间。针对这些薄弱环节，本项目计划从原位锇同位素测试所需硫化物标样和LA-MC-ICP-MS测试及校正方案两个方面开展研究工作。进而制备一套可用于地幔硫化物原位锇同位素测试的硫化物标准物质，改变国内标样不足的现状，并建立起新型原位锇同位素测试技术，为岩石圈地幔地球化学研究提供有效的技术支持。

Determination of Osmium isotope ratio has been an effective tool for geochemical research on mantle evolution. The mantle sulfide demonstrates the most of noble melt elements in mantle peridotite. Due to the coexistence of multistage sulfide in a same peridotite xenolith, Osmium isotope ratio of the bulk sample would be a mixture of these different generation sulfide. If we want to distinguish the Osmium isotope ratio of these different generation sulfide, it is imperative to develop an effective in-situ analytical technique that can provide definite geological information. However, there is few laboratory has successfully determinated in-situ Osmium isotope ratio of sulfide by LA-MC-ICP-MS over the world, which limited the development of geological research in related field. Generally, it is possible to improve the existing analytical technique from three aspects as following: reference materials, data calibration and sensitivity. Aiming at these shortages, we plan to make a series of sulfide reference materials and set up operation routine and data calibration for in-situ determination. Then, these sulfide reference materials will meet the needs of domestic laboratory and the improved in-situ analytical technique of Osmium isotope ratio of sulfide will provide effective technical support for geochemical research of lithospheric mantle.