ION MICROPROBE STUDY OF THE POMOZDINO AND PERAMIHO EUCRITES

Electron and ion microprobe measurements of major, minor, and trace el ement concentrations were made in individual grains of pyroxene, plagi oclase, and Ca phosphates in Pomozdino and Peramiho, two eucrites prev iously classified as anomalous. Although Pomozdino pyroxene is highly magnesian, minor and trace element concentrations in both pyroxene and plagioclase of this meteorite are similar to those in other noncumula te eucrites. High incompatible element concentrations (similar to thos e in Stannern) coupled with mg# typical of cumulate eucrites confirm t he anomalous character of this meteorite but do not allow us to distin guish unequivocally between different possible modes of origin. Perami ho has mg# and trace element concentrations similar to main group eucr ites, indicating that this meteorite most probably belongs to this gro up. A previously reported low incompatible element concentration for P eramiho may be due to a sampling problem.