Studies of Neutron-Irradiated Fluid Inclusions by Laser- Microprobe, Noble-Gas Mass Spectrometry

这项研究涉及应用激光微探针仪来分析从单个矿物和流体包裹体中释放出的惰性气体。一方面，从辐照样品中释放出的40Ar/39Ar将通过质谱仪进行分析，以确定斯里兰卡拉卡麻粒岩中的变质矿物的年龄。这项技术可能会对成分分带的矿物进行测年，从而确定不同成岩成分的形成时间。此外，该方法还可用于单个流体包裹体释放出的惰性气体的分析。具体地说，流体包裹体中选定的元素可以在分析前通过中子照射转化为贵金属物种。可以对这些子气进行分析，以直接确定单个包裹体中母元素的含量。这些信息将提供有关液体的历史和来源的详细信息。

This research involves application of a laser-microprobe apparatus to analyze released noble gases from individual minerals and fluid inclusions. On the one hand released 40 Ar/39 Ar from irradiated samples will be analyzed via mass spectrometry to date metamorphic minerals in granulites from Sri Laaka. The technique potentially will allow dating of compositionally zoned minerals an, hence, timing of formation of different rock-forming components. In addition, the method can be applied to analysis of noble gases released from individual fluid inclusions. Specifically, selected elements in fluid inclusions can be converted to noble year species via neutron irradiation prior to analysis. These daughter gases can be analyzed to determine directly to infer contents of the parent elements in individual inclusions. Such information will provide details concerning the history and source of the fluids.