Computer Science
Scientific paper
Jan 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..21..194s&link_type=abstract
Earth and Planetary Science Letters, Volume 21, Issue 2, p. 194-200.
Computer Science
12
Scientific paper
Four pyroxenes with compositions En48Fs48Wo4, En47.5Fs47.5Wo5, En45Fs45Wo10 and En40Fs40Wo20, synthesized at 1200°C at atmospheric pressure, were heat-treated at 500, 600, 700, and 800°C for various lengths of time. These pyroxenes are variously ordered with respect to Fe2+ and Mg2+ without unmixing. The Fe2+-Mg2+ distribution over the two nonequivalent sites M1 and M2, determined through Mössbauer spectroscopy, is found to be a function of both temperature and concentration of Ca2+ at the M2 site. The preference of Fe2+ for the M2 site increases with decreasing temperature and increasing Ca2+. These data can be used to determine cation equilibration temperatures of lunar and terrestrial pigeonites. The lunar pigeonites usually indicate equilibration temperatures of 700-860°C, except the pigeonite from rock 14053, which may have been subjected to shock heating due to meteoritic impact.
Ghose Subrata
Saxena Surendra K.
Turnock A. C.
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