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The phase boundaries limiting the stability fields of the three different Mg(Fe)SiO 3  phases [orthoenstatite (Oen), low-temperature clinoenstatite (LCen), and high-pressure clinoenstatite (HCen)] that occur at the pressure-temperature conditions prevailing in the Earth’s upper mantle are inferred from Raman spectroscopy on quenched samples from high P-T experiments. There are subtle but significant differences between the spectra of Oen and the spectra of samples quenched within the stability field of HCen or LCen. The most prominent differences are additional peaks at 369 and 431 cm -1  in the spectrum of Cen and a systematic shift of the peak at 236 cm -1  in the Oen spectrum to 243 cm -1  in the Cen spectrum. However, no distinction can be made between samples quenched from the HCen and LCen stability fields. This is consistent with the fact that the HCen phase is non-quench- able and that the pyroxene phase observed in the experimental products is LCen as verified by pow­der X-ray diffraction.

The Mg(Fe)SiO 3 orthoenstatite-clinoenstatite transitions at high pressures and temperatures determined by Raman-spectroscopy on quenched samples