球粒陨石中单球粒硅含量测定及其意义

本工作采用14MeV中子活化分析方法,测定了20个单球粒及全岩的硅含量.结果表明:E、H、L、LL群石陨石中单球的硅含量均高于全岩的硅含量;全岩硅含量,按E、H、L、LL的次序,有逐步增高的趋势;非磁性单球硅含量,在普通球粒陨石中,按H、L、LL次序逐步增高.单球中硅含量高于全岩,间接证明凝聚形成球粒稍早于基质. 

Determination of Silicon in Meteoritic Chondrules and Its Significance

The silicon abundances are determined in 20 chondrules from Jilin, Xin Yang, Boxian and Dontai meteorite and their whole rock samples by 14 MeV Neutron activation analysis. The silicon abundances are riched in chondrules compared to the whole chondrite. Systematic increasing in the silicon abundances of whole chondrites with E, H, L, LL is observed and also systematic increasing in the silicon abundances of non-magnetic chondrules from ordinary chondrites with H, L, LLis observed.The fact that the silicon abundances are riched in individual chondrules compared to the whole chondrites indicates indirectly that the chondrule formation is earlier than the matrix.