Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 178, Issue 1, Pages 162-179Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-246X.2009.04142.x
Keywords
Mantle processes; Equations of state; High-pressure behaviour; Phase transitions; Planetary interiors; Physics of magma and magma bodies
Categories
Funding
- National Science Foundation [EAR-0409074, EAR-0409121]
- European Commission [MRTN-CT-2006-035957]
- NERC [NE/F017871/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F017871/1] Funding Source: researchfish
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We develop a self-consistent thermodynamic description of silicate liquids applicable across the entire mantle pressure and temperature regime. The description combines the finite strain free energy expansion with an account of the temperature dependence of liquid properties into a single fundamental relation, while honouring the expected limiting behaviour at large volume and high temperature. We find that the fundamental relation describes well previous experimental and theoretical results for liquid MgO, MgSiO3, Mg2SiO4 and SiO2. We apply the description to calculate melting curves and Hugoniots of solid and liquid MgO and MgSiO3. For periclase, we find a melting temperature at the core-mantle boundary (CMB) of 7810 +/- 160 K, with the solid Hugoniot crossing the melting curve at 375 GPa, 9580 K, and the liquid Hugoniot crossing at 470 GPa, 9870 K. For complete shock melting of periclase we predict a density increase of 0.14 g cm(-3) and a sound speed decrease of 2.2 km s(-1). For perovskite, we find a melting temperature at the CMB of 5100 +/- 100K with the perovskite section of the enstatite Hugoniot crossing the melting curve at 150 GPa, 5190 K, and the liquid Hugoniot crossing at 220 GPa, 5520 K. For complete shock melting of perovskite along the enstatite principal Hugoniot, we predict a density increase of 0.10 g cm(-3), with a sound speed decrease of 2.6 km s(-1).
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