A new set of thermodynamic models is presented for calculating phase relations in bulk compositions extending
from peridotite to granite, from 0.001 to 70 kbar and from 650 °C to peridotite liquidus temperatures, in the
system K 2 O–Na 2 O–CaO–FeO–MgO–Al 2 O 3 –SiO 2 –H 2 O–TiO 2 –Fe 2 O 3 –Cr 2 O 3 (KNCFMASHTOCr). The models
may be used to calculate phase equilibria in partial melting of a large range of mantle and crustal compositions.
They provide a good fit to experimental phase relation topologies and melt compositions across the
compositional range of the model. Compared with the preliminary model of Jennings & Holland (2015) for
peridotite–basalt melting relations, the inclusion of K 2 O and TiO 2 allows for better modelling of small melt
fractions in peridotite melting, and in reproducing rutile-bearing eclogite melting at high pressures. An improved
order–disorder model for spinel is now incorporated. Above 10 kbar pressure, wet partial melting relations may
be significantly affected by the dissolution of silicates in aqueous fluid, so the set of models includes an aqueous
low-density silicate-bearing fluid in addition to a high-density H 2 O-bearing silicate melt. Oxygen fugacity may
be readily calculated for the whole range of bulk compositions investigated, and the effect of water content on
melt fO 2 is assessed.Natural Environment Research Council grant (NE/ J021539/1
