Iron silicate perovskite and postperovskite in the deep lower mantle.

ABSTRACT: Ferromagnesian silicates are the dominant constituents of the Earth's mantle, which comprise more than 80% of our planet by volume. To interpret the low shear-velocity anomalies in the lower mantle, we need to construct a reliable transformation diagram of ferromagnesian silicates over a wide pressure-temperature (P-T) range. While MgSiO₃ in the perovskite structure has been extensively studied due to its dominance on Earth, phase transformations of iron silicates under the lower mantle conditions remain unresolved. In this study, we have obtained an iron silicate phase in the perovskite (Pv) structure using synthetic fayalite (Fe₂SiO₄) as the starting material under P-T conditions of the lower mantle. Chemical analyses revealed an unexpectedl

SUBMITTER: Yang Z 

PROVIDER: S-EPMC11046576 | biostudies-literature | 2024 Apr

REPOSITORIES: biostudies-literature