Computer Science
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..37..159k&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 1, p. 159-166.
Computer Science
11
Scientific paper
The exchange of Fe2+ and Mg2+ between olivine and garnet has been investigated at 50 kbar and 1100°C. Symmetric simple mixture assumptions are sufficient to describe the exchange reaction. Excess free energies of mixing of olivine and garnet are estimated to be 2.77 +/- 0.61 and 2.12 +/- 0.69 kcal per gram cation, respectively. From the data on Fe-Mg partitioning between olivine and orthopyroxene reported by Matsui and Nishizawa [1], the excess free energy of olivine at 30 kbar and 1000°C has been calculated under the same assumptions. The two values for excess energy of olivine are consistent within the standard error. The result indicates that orthopyroxene is non-ideal with a considerable positive deviation from Raoult's law, which may be comparable with that in the case of garnet.
Kawasaki Toshisuke
Matsui Yoshito
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