The Postspinel Phases in the Mg 2 SiO 4 -Fe 2 SiO 4 System
Abstract
Samples of olivine (Fo 0 Fa 100 , Fo 60 Fa 40 , Fo 80 Fa 20 , and Fo 100 Fa 0 ) and of spinel (Fo 50 Fa 50 , Fo 0 Fa 100 , where Fo is forsterite and Fa is fayalite) were subjected to pressures up to 250 kilobars in a diamond anvil press and were heated in situ up to ∼1700°C by an infrared beam from a continuous-wave YAG (yttrium-aluminum-garnet) laser. The brightness temperature was determined from the intensity of incandescence of the sample by means of an optical pyrometer. X-ray diffraction patterns of the samples, obtained after quenching and unloading, show conclusively that these compositions disproportionate to (Mg,Fe)O and SiO 2 (stishovite) under these conditions.
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