Publication: Advances in Polar Science (APS). Antarctic Research, Vol. 3, No. 1, 1~16, June 1992
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Author: Wang Daode and Lin Yangting
CNARC member: Polar Research Institute of China (PRIC)
Abstract: Bulk concentrations of Ir, OS, Co and other siderophile elements of metal phase in chondrites increase significantly with degree of oxidation, which together with Co - content of kamacite and Fa - content of olivine, reveal a continuous variation of redox in chondrites. Intermediate groups of E/H, H/L, L/LL, and LL/C, lying between E and H, H and L, L and LL, LL and C, respectively, were proposed based on Co content in kamacite, Fa value of olivine, Fs value of low - Ca pyroxene, bulk concentrations of Ir, Os and Co of metal phase and other taxonomic parameters. The discovery of intermediate groups increases the number of chemical groups of chondrites from 9 to 13. Both variation of redox in chondrites and presence of the intermediate groups of chondrites suggest a continuous chemical fractionation in the primordial solar nebula.
Key words: chondrite, classification, solar nebula
