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Phase relations in the system Mg 2 SiO 4 –MgCr 2 O 4  were studied at 10–24 GPa and 1600 °C using a high-pressure Kawai-type multi-anvil apparatus. We investigated the full range of starting compositions for the forsterite-magnesiochromite system to derive a  P – X  phase diagram and synthesize chromium-bearing phases, such as garnet, wadsleyite, ringwoodite, and bridgmanite of a wide compositional range. Samples synthesized at 10 GPa contain olivine with small chromium content and magnesiochromite. Mg 2 SiO 4  wadsleyite is characterized by the pressure-dependent higher chromium solubility (up to 7.4 wt% Cr 2 O 3 ). The maximal solubility of chromium in ringwoodite in the studied system (~ 18.5 wt% Cr 2 O 3 ) was detected at  P  = 23 GPa, which is close to the upper boundary of the ringwoodite stability. Addition of chromium to the system moves the boundaries of olivine/wadsleyite and wadsleyite/ringwoodite phase transformations to lower pressures. Our experiments simulate Cr-rich phase assemblages found as inclusions in diamonds, mantle xenoliths, and UHP podiform chromitites.

Chromium-bearing phases in the Earth’s mantle: Evidence from experiments in the Mg 2 SiO 4 –MgCr 2 O 4 system at 10–24 GPa and 1600 °C