Abstract
From the fusion curves of six silicate/aluminosilicate minerals (Mg2SiO4, MgSiO3, CaMgSi2O6, Mg3Al2Si3O12, NaAlSi2O6, NaAlSi3O8) and availble thermodynamic data, isothermal compressibilities were calculated for pressures ranging from 0.001 to 150 kbar. In all cases the compressibility decreases with increasing pressure, but for liquid pyrope and jadeite this decrease is quite important at 40<P<60 and 29<P<43 kbar, respectively. The density of the liquid phase is always smaller than that of the solid phase when the two phases are in equilibrium. The composition dependence is appreciable, the two major factors seem to be the degree of polymerisation and the presence of aluminum.
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