Abstract
Phase transformations in a synthetic hedenbergite (CaFeSi2O6) have been observed with X-ray diffraction up to 26 GPa at ∼ 1200° C in a diamond anvil cell with a YAG laser heating system. Hedenbergite first decomposes into spinel, stishovite, and cubic perovskite phases at ∼ 16 GPa, and spinel further decomposes into wüstite and stishovite at ∼ 19 GPa. Between 19 GPa and 26 GPa, the phase assemblage is wüstite + stishovite+ perovskite. On decompression to 0.1 MPa, all the highpressure phases are retained except the cubic perovskite, which reverts to a retrogressive phase of CaSiO3. A comparison of the results of this study with those from a previous study on a natural hedenbergite suggests that the garnet phase formed from natural hedenbergite is stabilized by manganese.
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Kim, YH., Ming, L.C., Manghnani, M.H. et al. Phase transformation studies on a synthetic hedenbergite up to 26 GPa at 1200° C. Phys Chem Minerals 17, 540–544 (1991). https://doi.org/10.1007/BF00202232
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DOI: https://doi.org/10.1007/BF00202232