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

  • Rebecca A. Lange EMAIL logo
Published/Copyright: March 31, 2015
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Abstract

The 1bar, thermodynamic properties of crystalline and liquid NaAlSi3O8 are used to calculate the fusion curve of albite to 10 kbar. The calculated temperatures (±2σ) 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' = dKT,0 / dP, where KT,0 = 1/βT,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 (βT,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).

Received: 2001-11-6
Accepted: 2002-8-20
Published Online: 2015-3-31
Published in Print: 2003-1-1

© 2015 by Walter de Gruyter Berlin/Boston

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