镁橄榄石非谐性的水效应

摘要

In order to quantify the effects of hydration on anharmonicity of olivine thermodynamics,we havemeasured in situ Raman spectra of an extremely hydrous forsterite with4500ppm(wt)H2O at temperaturesup to1273K.All the Raman modes in hydrous forsterite shift linearly to lower wavenumbers with increasingtemperature.The calculated isobaric mode Grünesien parameters related to SiO4internal stretching andbending vibrations are much lower than lattice vibrations.