Melting in the Mg2SiO4-H2O system at 3 to 12 GPa

Details Melting in the Mg2SiO4-H2O system at 3 to 12 GPa Melting in the Mg2SiO4-H2O system at 3 to 12 GPa

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..233l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 233-235.

Physics

9

Earth Mantle, Forsterite, High Pressure, Melting, Adiabatic Conditions, Magnesium Compounds, Silicates, Water

Scientific paper

The melting of forsterite (Mg2SiO4) in the presence of H2O was studied from 3 to 2 GPa in a multiple-anvil apparatus to constrain the maximum temperature of the hydrous solidus in peridotitic systems relevant to the earth's mantle. The solidus has a negative slope to 12 GPa, despite the stabilization of Phase E coexisting with forsterite and vapor at the solidus at greater than 9 GPa. Abundant quench vapor deposits in all the run products indicate extensive solubility of silicate in the vapor, however, there is no direct evidence for incogruent solution in the vapor to 9 GPa. At greater than 9 GPa, the coexistence of Fo + PhE + V at the solidus requires Mg/Si not equal to 2 in the vapor. Silicate melts and hydros vapors remain immiscible phases in this system to greater than 12 GPa.

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