密封石英管爆裂法快速分析包裹体中CO_2碳同位素  

A Rapid Method for Determination of Carbon Isotope of Inclusions by Sealed Quartz Tube Decrepitation

作　　者：李洪伟[1] 冯连君[1] 陈健[1] 

机构地区：[1]中国科学院地质与地球物理研究所,中国科学院矿产资源研究重点实验室,北京100029

出　　处：《分析化学》2014年第1期127-130,共4页Chinese Journal of Analytical Chemistry

摘　　要：传统的包裹体中CO2碳同位素制备分析方法，通常是在真空条件的管式加热炉中对样品进行加热爆裂，进而释放包裹体中的CO2，并对其进行提取纯化，测定碳的同位素组成。本实验建立了密封石英管爆裂法：将包裹体样品在真空条件下密封在单个的石英样品管中进行加热爆裂，进而收集纯化CO2气体，再对其进行碳同位素分析测试。密封石英管爆裂法能够获得高精度的碳同位素分析数据（1s=0．04‰）。对于包裹体样品（IGGZhu）的CO2碳同位素分析结果虽然具有较大的分布范围（-3．6‰～6‰），但其反映的是多期次包裹体混合的结果。另外，由于包裹体样品可以集中批次统一爆裂，简化了操作流程，提高了实验测试效率。单个石英样品管也避免了样品之间的污染问题。Based on the conventional method of carbon isotope composition in the inclusions, carbon dioxide in the inclusions was released and purified under vacuum with thermal decrepitation in a quartz tube furnace. The carbon isotope composition of CO2 was analyzed by mass spectrometry. In this study, using sealed-tube decrepitation method, the samples were put into quartz tube and sealed under vacuum. Then CO2 released through thermal decrepitation was purified and extracted. The carbon isotope analyzed by mass spectrometer has high precision （1σ=0.04‰） employing the sealed tube method. The big variations （-3.6‰ to -6‰） in carbon isotope of inclusions sample （IGGZhu） suggest the mixing of the multi-phase inclusions. In addition, sealed quartz tube method for the analysis of the carbon isotope in inclusions simplifies operational processes and improves the efficiency of the experiment through batch decrepitation. The quartz tube also excludes the possibility of the contamination from different samples.

关 键 词：包裹体 密封石英管爆裂法 碳同位素 

分 类 号：P597[天文地球—地球化学]