摘要
本文报导在MM—1200型质谱计系统上,应用同位素稀释法测定了亳县陨石的放射成因Ar^(40)和宇宙成因的Ar^(38)的含量.通过计算,得到K—Ar 气体保留年龄为2080.53百万年(平均值),Ar^(38)宇宙射线暴露年龄为17百万年(平均值),在这些成果的基础上,讨论了该陨石的演化史.
The concentrations fo radiogenic Ar^(40) and cosmogenic Ar^(35) in AnhueiBexian chondrite have been measured by the isotopic dilution technique on theMM-1200 mass spectrometor system.These data proved a K-Ar apparent age of21 b.y.and an exposure age of 17 m.y.for this chondrite.Based on theseresults,we discussed the evolutional history of the stone meteorite.
