Melting of β-quartz up to 2.0 GPa and thermodynamic optimization of the silica liquidus up to 6.0 GPa

Details Melting of β-quartz up to 2.0 GPa and thermodynamic optimization of the silica liquidus up to 6.0 GPa Melting of β-quartz up to 2.0 GPa and thermodynamic optimization of the silica liquidus up to 6.0 GPa

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pepi..130..159h&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 130, Issue 3-4, p. 159-174.

Physics

6

Scientific paper

Melting relations of β-quartz were experimentally determined at 1.0GPa (/1900+/-20°C), 1.5GPa (/2033+/-20°C), and 2.0GPa (~/2145+/-20°C) using a new high-pressure assembly in a piston-cylinder apparatus and substantial differences were found with data previously reported. The new melting data of β-quartz were combined and optimized with all available thermodynamic, volumetric, and phase equilibria data for β-cristobalite, β-quartz and coesite to produce a P-T liquidus diagram for silica valid up to 6.0GPa. Using the new optimized thermodynamic parameters, the invariant point β-/cristobalite+β-/quartz+liquid and β-/quartz+coesite+liquid were determined to lie at /1687+/-17°C and 0.457GPa, and /2425+/-25°C and 5.00GPa, respectively.

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