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Potential host phase of aluminum and potassium in the Earth’s lower mantle
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March 26, 2015
Abstract
An Al-rich phase produced by phase transformation from a natural mid-oceanic ridge basalt under lower mantle conditions was studied by X-ray diffraction and analytical transmission electron microscopy. The phase, coexisting with silicate perovskites, the Ca-ferrite-structure phase, and stishovite, has hexagonal symmetry (space group P63/m) and the composition [(M+,Ca)1(Mg,Fe)2]∑3(Al,Si)5.5-6.0O12, where M = Na+, K+. The alkali-free phase with the complex solid solution, [Ca0.79Mg0.12] ∑ 0.91[Mg]2.00 [Al4.09Si1.48] ∑ 5.57⃞0.43O12, has a unit cell with a = 8.765 (3) Å, c = 2.762 (3) Å, V = 183.7 (2) Å3, Z = 1, a formula weight = 429.31, and a calculated density = 3.88 g/cm3 at 0 GPa and 4.16 g/cm3 at 23 GPa. This Al-rich phase is considered to be same as the hexagonal phases recently reported, and thus the hexagonal phases can potentially host alkali and alkali-earth elements in the lower mantle.
Received: 2000-7-19
Accepted: 2001-1-19
Published Online: 2015-3-26
Published in Print: 2001-5-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Electron microscope study of the reaction olivine + H2O + TiO2 → titanian clinohumite + Titanian chondrodite synthesized at 8 GPa, 1300 K
- In situ discovery of shock-induced graphite-diamond phase transition in gneisses from the Ries Crater, Germany
- Evaluation of shear moduli and other properties of silicates with the spinel structure from IR spectroscopy
- Thermodynamics of the amphiboles: Anthophyllite-ferroanthophyllite and the ortho-clino phase loop
- Illumination of vein quartz textures in a porphyry copper ore deposit using scanned cathodoluminescence: Grasberg Igneous Complex, Irian Jaya, Indonesia
- Rare earth elements in synthetic zircon: Part 1. Synthesis, and rare earth element and phosphorus doping
- Rare-earth elements in synthetic zircon: Part 2. A single-crystal X-ray study of xenotime substitution
- Single-crystal in situ high-temperature structural investigation on strontium feldspar
- Evidence of heterovalent europium in zoned Llallagua apatite using wavelength dispersive XANES
- Characterization of manganese oxide mineralogy in rock varnish and dendrites using X-ray absorption spectroscopy
- Oxidation state and coordination of Fe in minerals: An Fe K-XANES spectroscopic study
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- Molecular dynamics simulations of seismic discontinuities and phase transitions of MgSiO3 from 4 to 6-coordinated silicate via a novel 5-coordinated phase
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