Kerridge J F
Institute of Geophysics, University of California, Los Angeles 90024, USA.
Geochim Cosmochim Acta. 1985;49:1707-14. doi: 10.1016/0016-7037(85)90141-3.
Whole-rock samples of 25 carbonaceous chondrites were analysed for contents of C, H and N and delta 13C, delta D and delta 15N. Inhomogeneous distribution of these isotopes within individual meteorites is pronounced in several cases. Few systematic intermeteorite trends were observed; N data are suggestive of isotopic inhomogeneity in the early solar system. Several chondrites revealed unusual compositions which would repay further, more detailed study. The data are also useful for classification of carbonaceous chondrites; N abundance and isotopic compositions can differentiate existing taxonomic groups with close to 100% reliability; Al Rais and Renazzo clearly constitute a discrete "grouplet"' and there are hints that both CI and CM groups may each be divisible into two subgroups.
对25块碳质球粒陨石的全岩样本进行了碳、氢、氮含量以及δ¹³C、δD和δ¹⁵N的分析。在若干情况下，这些同位素在单个陨石中的分布明显不均匀。未观察到陨石间的几个系统趋势；氮数据表明早期太阳系中存在同位素不均匀性。几块球粒陨石显示出不同寻常的成分，值得进一步进行更详细的研究。这些数据对于碳质球粒陨石的分类也很有用；氮丰度和同位素组成能够以近100%的可靠性区分现有的分类群；阿拉伊斯陨石和雷纳佐陨石显然构成一个离散的“小类群”，并且有迹象表明CI和CM群各自可能都可分为两个亚群。
