ADVANCES IN POLAR SCIENCE ›› 1992, Vol. 3 ›› Issue (1-English): 1-16.

• Contents •     Next Articles

INSPIRATION FROM STUDY OF ANTARCTIC METEORITES I:PETROGRAPHIC AND COMPOSITIONAL EVIDENCES FOR EARLY CONTINUOUS CHEMICAL FRACTIONATION OF THE SOLAR NEBULA

 Wang Daode and Lin Yangting   

  1. Institute of Geochemistry, Guangzhou Branch, Academia Sinica, Guangzhou 510640
  • Online:1942-03-30 Published:1942-03-30
  • Contact: Wang Daode
  • Supported by:

    Supported by State Antarctic Committee and Chinese Academy of Sciences.

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