Experimental study of elemental process of the earth's core formation-Noble gas geosientific approach-

我们在1994年用石墨容器进行实验时，得到了惰性气体在金属中没有掺入的结果，而在1995年用氧化镁容器进行实验时，惰性气体在金属和硅酸盐之间平均分配。我们认为，在以前的实验中，有相当数量的碳溶解在金属中，并对惰性气体的分配产生了影响。氧化镁容器也与样品发生反应，我们在扫描电子显微镜下观察到。今年我们进行了以氮为主的分配实验，并对装置进行了改进，使其不与样品发生反应。我们使用了来自Ichinomegata的二辉橄榄岩样品和铁与氧化镁容器。我们将钼箔放在氧化镁容器内，将氧化镁放在铁样下面，以保护容器与样品的反应。我们人工添加碳，最终可以将金属中的碳含量控制在我们的期望值。金属中的碳含量为0.5%~wt.%，随着碳含量的增加，氮和惰性气体在金属中的分配较少。从而证实了碳对氮气和惰性气体的分配有影响。我们还检测了铁陨石中的稀有气体，但同源成分占主导地位。

We obtained the result that noble gases did not incorporated in metal at the experiment using graphite vessel in 1994, but noble gases were equally partitioned between metal and silicate when we used MgO vessel in 1995. We considered that considerable amounts of carbon dissolved in metal in the former experiment and gave effect on the partition of noble gases. The MgO vessel also made reaction with the sample, which we observed under SEM.We proceeded the experiment of partition mainly for nitrogen this year, and improved the device not to react the vessel with the sample. We used the lherzolite sample from Ichinomegata and iron with MgO vessel. We put Mo foil inside the MgO vessel and MgO under the iron sample to protect the reaction of the vessel with the sample. We artificially added carbon, and could finally control the carbon content in metal at our expected values. The carbon content in metal was 0.5 to wt.%, and nitrogen and noble gases were less partitioned into metal with increasing carbon content. Thus, we confirmed that the carbon gave effect on the partition of nitrogen and noble gases. We also examined the noble gases in iron meteorite, but consmogenic component was predominant.