A cryogenic system for high-precision isotopic analysis of noble gases in rocks and fluids

请求提供的设备是低温泵，用于在进行同位素分析之前将惰性气体种类分离并浓缩到质谱仪中。它将完成在GEOTOP-UQAM-McGill（GEOTOP-UQAM-McGill）的一个区域设施，用于流体和岩石中惰性气体同位素的高精度分析，并应用于内部和外部地球动力学。该设施包括一个高分辨率多收集惰性气体质谱仪、一个低分辨率质谱仪和一个入口系统，用于从流体和岩石中提取惰性气体，并在进行同位素分析之前对其进行净化。所要求的低温系统将能够显著改善对极少量同位素的分析，如3 He、21 Ne、38 Ar和124，126，128 Ar。稀有气体是惰性和稀有的，这两个特性使它们成为地球上主要地质过程的优秀示踪剂。在GEOTOP，基础研究课题集中在过去的气候，通过分析海洋孔隙沃茨中的惰性气体，洞穴沉积物中捕获的流体包裹体和行星际尘埃颗粒。工业界支持的研究重点是研究魁北克具有经济重要性的流体的大规模迁移。今后将在地幔地球化学（捕虏体中惰性气体的分析）和海洋阶地的宇宙成因年代测定方面开展工作，以量化过去的海平面变化。所有这些课题都需要使用所提出的低温仪器来改进低量同位素的分析。在我的监督下，其他研究人员和学生将完全可以使用这些设备。该设备将成为学生学习质谱和同位素地球化学的绝佳培训设施。

The requested equipment is cryogenic pump for separating and concentrating noble gas species into a mass spectrometer, prior of their isotopic analysis. It will complete a regional facility at GEOTOP-UQAM-McGill (Laboratoire GRÀM: Gaz Rares à Montrèal) for high precision analysis of noble gas isotopes in fluids and rocks with applications in both internal and external geodynamics. This facility consists of a high-resolution multi-collection noble gas mass spectrometer, a low-resolution mass spectrometer and an inlet system for the extraction of noble gases from fluids and rocks and their purification prior of their isotopic analysis. The requested cryogenic system will allow improving significantly the analyses of very low-amount isotopes such as 3He, 21Ne, 38Ar and 124,126,128Xe. Noble gases are inert and rare and these two characteristics make them excellent tracers of major geological processes on earth. At GEOTOP, fundamental research topics are focused on past climates, through analyses of noble gases in oceanic pore waters, fluid inclusions trapped in speleothems and Interplanetary Dust Particles. Industrial-supported research is focused on the study of large-scale migration of fluids of economic importance in Quebèc. Future developments will be done in mantle geochemistry (analyses of noble gases in xenoliths) and cosmogenic dating of marine terraces for quantifying past sea level changes. All these topics require the use of the proposed cryogenic instrumentation for improving analysis of low amount isotopes. The equipment will be fully accessible to other researchers and students under my supervision. The equipment will be an excellent training facility for students to learn mass spectrometry and isotope geochemistry.