Hydrous Fo91 ringwoodite crystals were synthesized at 20 GPa and high-temperature conditions using a multi-anvil press. Recovered crystals were analyzed using electron microprobe analysis, Raman spectroscopy, infrared spectroscopy, synchrotron Mössbauer spectroscopy, single-crystal X-ray diffraction, and single-crystal Laue neutron diffraction, to carefully characterize the chemistry and crystallography of the samples. Analysis of the combined data sets provides evidence for the presence of tetrahedrally coordinated ferric iron and multiple hydrogen incorporation mechanisms within these blue-colored iron-bearing ringwoodite crystals. Tetrahedral ferric iron is coupled with cation disorder of silicon onto the octahedrally coordinated site. Cation disorder in mantle ringwoodite minerals may be promoted in the presence of water, which could have implications for current models of seismic velocities within the transition zone. Additionally, the presence of tetrahedrally coordinated ferric iron may cause the blue color of many ringwoodite and other high-pressure crystals.

Thomson, A., Piltz, R., Crichton, W., Cerantola, V., Ezad, I., Dobson, D., et al. (2021). Incorporation of tetrahedral ferric iron in hydrous ringwoodite. AMERICAN MINERALOGIST, 106(6), 900-908 [10.2138/am-2021-7539].

Incorporation of tetrahedral ferric iron in hydrous ringwoodite

Cerantola, V;
2021

Abstract

Hydrous Fo91 ringwoodite crystals were synthesized at 20 GPa and high-temperature conditions using a multi-anvil press. Recovered crystals were analyzed using electron microprobe analysis, Raman spectroscopy, infrared spectroscopy, synchrotron Mössbauer spectroscopy, single-crystal X-ray diffraction, and single-crystal Laue neutron diffraction, to carefully characterize the chemistry and crystallography of the samples. Analysis of the combined data sets provides evidence for the presence of tetrahedrally coordinated ferric iron and multiple hydrogen incorporation mechanisms within these blue-colored iron-bearing ringwoodite crystals. Tetrahedral ferric iron is coupled with cation disorder of silicon onto the octahedrally coordinated site. Cation disorder in mantle ringwoodite minerals may be promoted in the presence of water, which could have implications for current models of seismic velocities within the transition zone. Additionally, the presence of tetrahedrally coordinated ferric iron may cause the blue color of many ringwoodite and other high-pressure crystals.
Articolo in rivista - Articolo scientifico
high P-T synthesis; Mössbauer spectroscopy; Ringwoodite; single-crystal diffraction;
English
900
908
9
Thomson, A., Piltz, R., Crichton, W., Cerantola, V., Ezad, I., Dobson, D., et al. (2021). Incorporation of tetrahedral ferric iron in hydrous ringwoodite. AMERICAN MINERALOGIST, 106(6), 900-908 [10.2138/am-2021-7539].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/397676
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