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

本研究涉及应用激光微探针装置来分析从单个矿物和流体包裹体中释放的稀有气体。一方面，从辐照样品中释放的40 Ar/39 Ar将通过质谱分析来确定斯里兰卡拉卡麻粒岩中的变质矿物。这项技术将有可能确定矿物组成分带的年代，从而确定不同岩石形成成分的形成时间。此外，该方法还可用于分析单个流体包裹体中释放的惰性气体。具体来说，流体包裹体中选定的元素可以在分析前通过中子辐照转化为惰性年元素。分析这些子气体可以直接确定或推断出单个包裹体中母元素的含量。这些信息将提供有关流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.