Geophysical Research Letters · 2005 · 220 citations · 31 references
Natural SciencesEarth SciencesGeophysicsGeochemistryMineralogyPetrologyMantle GeochemistryMantle PetrologyMetamorphic MineralsMineral ChemistryMineral GeochemistrySilicate MineralsLower Mantle StructureMantle MineralogyMineral Phase AnalysisMineral Physics Of The MantleOxide Mineral ChemistryPhase Transitions In The MantlePlanetary Mantle CompositionSilicate Mineral Chemistry
Phase relations of a natural mantle composition were determined up to 126 GPa and 2450 K by in‐situ x‐ray diffraction measurements in a laser‐heated diamond‐anvil cell (LHDAC). MgSiO 3 ‐rich perovskite (MgPv) transforms to a post‐perovskite phase (MgPP) at about 113 GPa and 2500 K (400‐km above the core‐mantle boundary) and the lowermost mantle consists of MgPP, (Mg, Fe)O magnesiowüstite (Mw), and CaSiO 3 ‐rich perovskite (CaPv). Chemical analyses on recovered samples using transmission electron microscope (TEM) show that the distribution of iron significantly changes at the post‐perovskite phase transition. A strong enrichment of iron in Mw leads to the unique geophysical and geochemical properties of the lowermost mantle.
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The quantitative analysis of thin specimens
G. Cliff, G. W. Lorimer · Journal of Microscopy · 1975 · 1.8K citations
Natural Sciences, Materials Engineering, Materials Science +16
Post-Perovskite Phase Transition in MgSiO <sub>3</sub>
Motohiko Murakami, Kei Hirose, Katsuyuki Kawamura et al. · Science · 2004 · 1.3K citations