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- W1505204816 abstract "The high-pressure phase of pyrope (Mg 3 Al 2 Si 3 O 12 ) was investigated using a laser heated diamond anvil cell in the pressure range of 20-60 GPa. The quenched samples were examined by X ray diffraction technique using synchrotron radiation and scanning electron microscopy with energy dispersive X ray analyzer (SEM-EDX). These analyses revealed that the dissociation of pyrope into a perovskite phase and a corundum structured phase starts at about 25 GPa and these two phases persist up to the highest pressure investigated. The single phase of perovskite isochemical with pyrope was not formed in the experimental conditions. The Al 2 O 3 content of the perovskite structure was about 18 mol% at 45 GPa. Our study demonstrates that the post-garnet phase in the pyrope composition is a mixture of an aluminous magnesian perovskite with the orthorhombic symmetry and an aluminous phase with the corundum structure, which is consistent with the result of multianvil experiments reported by Irifune et al. However, the chemical compositions of two phases and their pressure dependencies are different from that of Irifune et al. and the transition pressure to a perovskite isochemical with pyrope is possibly much higher than that estimated by them." @default.
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- W1505204816 date "1998-01-01" @default.
- W1505204816 modified "2023-10-16" @default.
- W1505204816 title "Phase transition of pyrope garnet under lower mantle conditions" @default.
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- W1505204816 doi "https://doi.org/10.1029/gm101p0419" @default.
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