抄録
The crystal structures of seventeen natural Mg–Fe olivines from nine rock specimens of seven different rock types were refined by X-ray diffraction method. Intensity data of the two olivines were also obtained at high temperatures ranging from 200°C to 700°C. The site occupancy refinements of the unheated olivines showed that volcanic olivines and a metamorphic olivine have a slight preference of Fe for the M1 and M2 sites, respectively. In-situ high temperature X-ray experiments showed that the KD (= Fe/Mg)M1/(Fe/Mg)M2 values of the heated olivines increased with increasing temperature, and the KD values of the olivines heated above 600°C increase with increasing fayalite content.
