Mathematics – Logic
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..123l&link_type=abstract
Earth and Planetary Science Letters, Volume 64, Issue 1, p. 123-138.
Mathematics
Logic
20
Scientific paper
Heating experiments were carried out, at 1100°C and 1200°C under controlled oxygen fugacity, on olivine-spinel assemblages from New Caledonia. This mineral pair constitutes a perfect experimental material for such studies. The result was a marked change in chemical composition of the minor phase, olivine: it becomes enriched in iron and chromium and the magnesium and nickel contents decrease. Careful studies of the influence of oxygen fugacity show that, though it has a strong effect on the rate of re-equilibration, it does not affect the equilibrium composition of the phases. The stability limits of the mineralogical assemblage used are also examined. Our results show the possibility of an important subsolidus re-equilibration in natural assemblages containing olivine and spinel. A new equation for the geothermometer based upon Fe2+-Mg2+ partitioning between olivine and spinel is proposed and some applications discussed.
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