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Eutectic melting temperatures for the assemblage Ca(OH) 2  + CaCO 3  in the presence of excess H 2 O were determined along six isochores of H 2 O in a hydrothermal diamond-anvil cell. These temperatures range from 610 °C at 1204 bar to 583 °C at 7203 bar; they agree very well (within 3 °C) with data obtained from high-pressure differential thermal analysis (HP-DTA) and are about 20 °C lower than those obtained from quench experiments. The additional DTA peaks near 630 °C for the melting experiments of pure portlandite reported by Harker (1964) and Bai et al. (1994) may be the result of a small amount of melting, caused by CaCO 3  contamination, and not the result of a solid phase transition between portlandite and "portlandite II."

american mineralogist

Hydrothermal diamond-anvil cell study of melts: Eutectic melting of the assemblage Ca(OH) 2  + CaCO 3  with excess H 2 O and lack of evidence for "portlandite II" phase