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矿物岩石样品经加热释放出的气体,除稀有气体外,还有各种活性气体.必须先除去这些活性气体,获得纯净的稀有气体,才能送入质谱仪进行稀有气体同位素分析或40Ar/39Ar定年分析.常规的纯化装置能满足多数地质样品的气体纯化要求.但是,一些矿物岩石样品含有较高的杂质成分,尤其是油气田储层砂岩自生伊利石等矿物,常规纯化装置不能完全除去杂气,影响了稀有气体分析和40Ar/39Ar定年的数据质量.本文介绍的有机杂气纯化系统是由多个可循环使用纯化装置组合而成,各个装置的工作温度和去气温度不同.样品释出的气体通过该套纯化系统后,能够有效地除去水、氮气、二氧化碳和有机挥发份等杂质气体.云母类矿物是40Ar/39Ar定年最主要的测试矿物之一,特殊环境形成的云母类矿物可能包含一些杂质,实验中发现一个白云母样品采用常规方法不能获得纯净的稀有气体,该白云母成为本次对比实验的研究对象.交替“关闭/开启”这套有机杂气纯化系统,分4部分进行实验对比.实验表明,关闭有机杂气纯化系统时,40Ar随测量时间呈曲线变化,气体纯化效果差,年龄误差大;开启新的纯化系统时,40Ar随测量时间呈直线下降,气体纯化效果好,年龄误差小,数据质量明显提高.
In addition to the rare gases, there are a variety of active gases that are released from the heat of the mineral rock samples, which must be removed before they can be sent to the mass spectrometer for rare gas isotope analysis or 40Ar / 39Ar dating However, some samples of mineral rock contain high impurity components, especially the self-generated illite and other minerals from the sandstone of oil and gas fields. The conventional purification device can not completely remove the gas from the gas, Affecting the data quality of rare gas analysis and 40Ar / 39Ar dating.The introduction of organic gas purification system is composed of a plurality of recyclable purification device combination, the working temperature of each device and the degassing temperature is different from the sample release After passing through the purification system, the gas can effectively remove impurity gases such as water, nitrogen, carbon dioxide and organic volatiles, etc. Mica minerals are one of the most important test minerals in the 40Ar / 39Ar dating. Mica minerals formed under special circumstances may contain Some impurities, the experiment found a sample of muscovite using conventional methods can not get pure and rare gas , The muscovite to become the object of this comparative experiment.Alternate “closed / open ” This set of organic gas purification system, experimental comparison in 4. Experimental results show that, close the organic impurity purification system, 40Ar with the measurement The curve of time was changed, the effect of gas purification was poor and the age error was large. When the new purification system was started, the 40Ar decreased linearly with the measurement time, the gas purification effect was good, the age error was small, and the data quality was obviously improved.