Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..855s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 855-858.
Physics
23
Liquidus, Melting, Perovskites, Silicates, Solidus, Chemical Evolution, Earth Mantle, Iron Compounds, Magnesium Compounds, Thermal Analysis
Scientific paper
Results are presented of an experimental study in which iron-magnesium-silicate perovskite was melted in a laser-heated diamond anvil cell and monitored by thermal analysis. Two signals are identified at each pressure: a lower temperature signal and a higher temperature signal. The higher signal would then correspond to melting of magnesium-enriched silicate perovskite. Alternatively, the lower signal may be the solidus where (Fe(.14)Mg(.86))SiO3 undergoes incongruent melting to an iron-magnesium-enriched solid plus a silica-enriched liquid. Then the higher signal would be the liquidus. The slope for the melting curve (the higher signal) between 30 GPa and 94 GPa is slightly negative. The present melting curve is several hundred degrees (K) below previous estimates.
Heinz Dion L.
Sweeney Jeffrey S.
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