articleGeochemistry Geophysics GeosystemsMay 1, 2002BRONZE OA

The pMELTS: A revision of MELTS for improved calculation of phase relations and major element partitioning related to partial melting of the mantle to 3 GPa

MSM. S. GhiorsoMMM. M. HirschmannPWPeter W. ReinersVCV. C. Kress

University of Washington · Earth and Space Research · +2 more institutions

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Abstract

We describe a newly calibrated model for the thermodynamic properties of magmatic silicate liquid. The new model, pMELTS, is based on MELTS [ Ghiorso and Sack , 1995 ] but has a number of improvements aimed at increasing the accuracy of calculations of partial melting of spinel peridotite. The pMELTS algorithm uses models of the thermodynamic properties of minerals and the phase equilibrium algorithms of MELTS, but the model for silicate liquid differs from MELTS in the following ways: (1) The new algorithm is calibrated from an expanded set of mineral‐liquid equilibrium constraints from 2439 experiments, 54% more than MELTS. (2) The new calibration includes mineral components not considered during calibration…

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Topics & keywords

Topics
Keywords
  • Peridotite
  • Partial melting
  • Spinel
  • Silicate
  • Mantle (geology)
  • Thermodynamics
  • Calibration
  • Geology
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