黄铁矿原位LA-ICP-MS微量元素分析在金矿床中应用

运用LA-ICP-MS对金属硫化物、氧化物进行原位微区微量元素分析具有灵敏度高、检出限低、多元素同时检测的优势, 应用前景广阔。本文综述了黄铁矿LA-ICP-MS原位微量元素分析在金矿研究方面的应用, 指出在详细的岩相学观察基础上, 将LA-ICP-MS分析与电子探针背散射分析、X射线面扫描分析、原位S/Fe同位素分析技术等连用, 可用于判断黄铁矿中微量元素的赋存状态, 约束变质变形过程中微量元素的活化-迁移行为, 反演成矿流体性质及演化规律, 示踪成矿物质来源, 精细刻画成矿过程, 有效约束矿床成因。

The application of pyrite LA-ICP-MS trace element analysis to gold deposits

Laser ablation-inductively coupled plasma-mass spectrometer(LA-ICP-MS)is a newly-developed techniques for in situ trace element analysis of sulfides and oxides, offering high sensitives, low detection limit, and simultaneous capture of up to 20 trace elements. In this contribution, we review its application to gold deposit, and conclude that once combined with backscattered electron mode of scanning electron microscopy, X-ray elemental mapping, in situ sulfur/iron isotope analyses, pyrite LA-ICP-MS analysis can be used to determine the distribution of trace elements in pyrite, track their remobilization-transportation during deformation-metamorphism, probe into the composition and evolution the ore-forming fluids, determine potential sources of metals, depict detailed ore-forming processes, and constrain the genesis of ore deposits.