Research Directed Toward the Electron Microanalysis of Mineral Phases in Chondrite Meteorites

摘要

The AMR Electron Beam Microanalyzer was employed to determine the variation in composition of the olivine and orthopyroxene (low calcium) compositions of twelve unequilibrated carbonaceous chondrites. These meteorites were found to exhibit a range of homogeneity. The chemistry of the olivine, orthopyroxene and clinopyroxene in seventeen equilibrated ordinary chondrites of the H, L, and LL groups were determined, and the variation of chemistry within each group was found to be less than 4%, with the exception of the Shaw and Uden meteorites. These chondrites are atypical which is demonstrated by the higher Ca content of the orthopyroxene. (Author)