Collaborative Research: ICPMS and Laser Ablation-ICPMS (LA-ICPMS) for the Determination of Metals in Fluid Inclusions: A Pilot Study

本提案旨在评估ICPMS和LA-ICPMS在流体包裹体中微量元素（包括稀土元素）测定中的应用。本方案所显示的初步数据表明，对特征良好的样品进行整体渗滤液分析是有用的，也表明LA-ICPMS可以分析单个流体包裹体。完善这些技术可以使我们直接分析热液系统不同阶段的流体，从而进一步了解成矿流体中金属的运移。在本次研究中，我们将实现三个主要目标：(1)充分开发用于分析大块包裹体中稀土元素和其他岩石学和经济上重要的微量金属的破碎浸出ICPMS；(2)评估LA-ICPMS用于研究单一流体包裹体的全部潜力；(3)对Bingham贱金属斑岩体系的大块流体包裹体进行详细的ICPMS研究，并对单个流体包裹体进行LA-ICPMS研究，以确定该体系中哪些流体携带了大块金属。选择宾厄姆是因为它被研究得很好，并且在石英中含有大量包裹体。需要像这里提出的研究来限制目前关于与硅岩浆系统有关的矿床中金属来源的争论。

9505982 Ruiz This proposal intends to evaluate the use of ICPMS and LA-ICPMS for the determination of trace elements, including rare earth elements (REE) in fluid inclusions. Preliminary data shown in this proposal suggest that the bulk leachate analyses of well characterized samples are useful and also indicate that it is possible to analyze single fluid inclusions by LA-ICPMS. perfecting these techniques may allow us to directly analyze fluids from various stages of hydrothermal systems which in turn will further our understanding of the transport of metals in ore-forming fluids. We will accomplish three main goals during this study: (1) fully develop the crush-leach ICPMS for analyzing bulk inclusions for REE and other petrologically and economically important trace metals, (2) evaluate the full potential of LA-ICPMS for the study of single fluid inclusions, (3) conduct a detailed ICPMS study on bulk fluid inclusions and LA-ICPMS study on single fluid inclusions from the Bingham, base metal porphyry system in order to determine which fluids carried the bulk of the metals in this system. Bingham was chosen because it is very well studied and contains large inclusions in quartz. Studies as the one proposed here are needed to constrain current debates on sources of metals in deposits associated with silicic magma systems.