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The fusion curve of albite revisited and the compressibility of NaAlSi₃O₈ liquid with pressure

Department of Geological Sciences, 2534 CC Little Building, University of Michigan, Ann Arbor, Michigan 48109-10663, U.S.A.

Correspondence: ^* E-mail: becky{at}umich.edu

The 1bar, thermodynamic properties of crystalline and liquid NaAlSi₃O₈ are used to calculate the fusion curve of albite to 10 kbar. The calculated temperatures (±2) of the melting reaction are 1152 (±7) °C at 3 kbar and 1247 (±24) °C at 10 kbar. The location of the calculated fusion curve to 10 kbar is in excellent agreement with phase-equilibrium constraints on the maximum and minimum temperatures of the fusion curve at 3 and 15 kbar, respectively. Calculation of the melting reaction at pressures >10 kbar requires that the pressure dependence of the liquid compressibility (K₀' = dK_T,0/dP, where K_T,0 = 1/ß_T,0) be known. On the basis of five half-reversal, crystallization experiments in the literature, which collectively provide minimum temperatures of the fusion curve between 12 and 32 kbar, K₀' (derived from the Birch-Murnaghan relation) is constrained to be 10 for liquid NaAlSi3O8. A comparison with other silicate liquids shows that there is a strong, positive correlation between the compressibility at one bar (ß_T,0) and K₀'. In addition, data on the water-saturated fusion curve of albite are used to quantify the effect of small amounts of H₂O (1 wt%) on lowering the melting temperature of albite (68 degrees).

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