黄铁矿微量元素LA-ICP-MS原位微区分析方法及其在金矿床研究中的应用

LA-ICP-MS原位微区分析技术具有空间分辨率高、检出限低等突出优点，可以有效地获得矿床不同成矿阶段矿物的微量元素组成信息。黄铁矿广泛分布在不同类型的金矿床中，是认识矿床成因的一个重要载体矿物。文章总结了近些年来LA-ICP-MS分析技术的发展趋势和其在分析黄铁矿微量元素指示金矿床成因方面的研究进展。研究提出了在详细的岩相学工作基础之上，利用LA-ICP-MS原位微区分析技术准确测定黄铁矿微量元素并结合元素面扫描可以有效限定微量元素在黄铁矿中的分布赋存状态，探讨了元素进入黄铁矿机理和富集过程；利用典型元素含量（组合或比值）可以有效地反演成矿流体性质、指示成矿物质来源，进而约束金矿床的成因。此外，文章还总结了近些年来黄铁矿微量元素在找矿勘查领域取得的系列成果，认为其在成矿潜力评价以及指导选矿加工等领域具有巨大的应用前景。总之，LA-ICP-MS分析技术是建立矿床学从宏观到微观研究的重要桥梁，与BSE、SEM、TEM以及同位素分析等技术结合，可以有效刻画金矿床形成的精细过程，对于约束成矿金属来源以及金富集沉淀机制等方面研究具有重要意义。

In situ LA-ICP-MS trace element analysis of pyrite and its application in study of Au deposit

In situ laser ablation-inductively coupled plasma-mass spectrometer (LA-ICP-MS) analysis has the outstanding advantages of high spatial resolution and low detection limit, which can effectively obtain the trace element compositions of different contemporaneous minerals. Pyrite, widely distributed in different types of gold deposits, is an important tracer mineral for understanding the genesis of gold deposits. By summarizing the development of LA-ICP-MS analytical technique and its application in gold deposit research, we proposed that based on detailed petrographic work, in situ LA-ICP-MS can accurately determine the trace elements of pyrite. This combined with trace element mapping and isotope analysis is helpful to define the distribution and occurrence state of trace elements in pyrite and to understand mechanism and enrichment process of elements entering pyrite. Element concentratons and element ratios can effectively determine the source of ore-forming metal and fluid, and restrict the genetic model of ore deposits. In addition, the application of trace elements of pyrite has made a series of achievements in the field of ore prospecting and exploration, which can be used to evaluate the metallogenic potential and guide mineral processing production, showing a great application prospect. Overall, the LA-ICP-MS analysis technology is an important bridge for the study of ore deposits from macroscopic to microcosmic aspects. Combined with BSE, SEM, TEM and isotope analyses, it can effectively describe the fine metallogenic process of gold deposits, and is of great significance for restricting the source of ore-forming metals, especially for the mechanisms of gold enrichment and precipitation.