Equation of State and Spin Crossover of (Al, Fe)‐Phase H

Strozewski, Benjamin; Buchen, Johannes; Sturhahn, W.; Ishii, Takayuki; Ohira, Itaru; Chariton, Stella; Lavina, Barbara; Zhao, Jiyong; Toellner, T. S.; Jackson, Jennifer M.

doi:10.1029/2022jb026291

JGR Solid Earth

2023

DOI: 10.1029/2022jb026291

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Equation of State and Spin Crossover of (Al, Fe)‐Phase H

Benjamin Strozewski

Johannes Buchen

W. Sturhahn

et al.

Abstract: In Earth's mantle, the volatile element hydrogen is incorporated into minerals as point defects in nominally anhydrous minerals and in the crystal structures of hydrous minerals (e.g.,

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2024

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Cited by 2 publications

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Hydrogen partitioning between stishovite and hydrous phase δ: implications for water cycle and distribution in the lower mantle

Ishii,

Criniti,

Purevjav

et al. 2024

Prog Earth Planet Sci

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Water is transported into the deep mantle by subducting slabs, playing important roles in mantle dynamics and evolution. An aluminous hydrous mineral, phase δ with a main component of AlOOH, has been considered an important water carrier in the lower mantle. Recent studies reported that SiO2 stishovite can accommodate weight percent levels of water, indicating another important water carrier in the lower mantle. However, which mineral can mainly carry water is not clear yet. Recent hydrous phase relation studies reported that stishovite is depleted in alumina when coexisting with hydrous phase δ, in which water content of stishovite was not investigated. In this study, we investigated hydrogen partitioning between stishovite and hydrous phase δ at 24–28 GPa and 1000–1200 °C by means of Kawai-type multi-anvil press in combination with Fourier-transform infrared spectroscopy at ambient conditions on recovered samples. Fourier-transform infrared spectra of recovered stishovites showed that water contents of stishovite coexisting with hydrous phase δ were limited to up to ~ 500 ppm. This indicates that coexisting hydrous phase δ causes not only depletion in alumina but also in hydrogen in stishovite and therefore mainly transports water in a cold subducting slab. Once hydrous phase δ becomes thermally unstable, alumina and water contents in silica minerals are increased by the chemical reaction between SiO2 and AlOOH, and aluminous silica minerals such as stishovite and CaCl2-type phase will be a main water carrier in the lower mantle. Presence of small-scale seismic scatterers observed around 1900 km depth, which was considered to be caused by a transition from almost pure SiO2 stishovite to CaCl2-type phase, might also be able to be explained by the phase transition of stishovite coexisting with hydrous phase δ.

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Hydrogen partitioning between stishovite and hydrous phase δ: implications for water cycle and distribution in the lower mantle

Ishii,

Criniti,

Purevjav

et al. 2024

Prog Earth Planet Sci

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Elastic anomalies across the P21nm→Pnnm structural phase transition in δ-(Al,Fe)OOH

Satta,

Criniti,

Kurnosov

et al. 2024

American Mineralogist

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Hydrogen may be recycled into the Earth's lower mantle by subduction and stabilized in solid solutions between phase H (MgSiO4H2), δ-AlOOH, ε-FeOOH, and SiO2 post-stishovite. In high-pressure oxyhydroxide phases, hydrogen is incorporated following the typical (OHO) sequence, adopting the asymmetric configuration O-H···O that evolves into a symmetric disordered state upon compression. Moreover these iron-/aluminum-bearing oxyhydroxides [δ-(Al,Fe)OOH] present a structural phase transition from P21nm to Pnnm as pressure increases. Here, the single-crystal elasticity of the P21nm phase of δ-(Al0.97,Fe0.03)OOH has been experimentally measured across the P21nm→Pnnm transition up to 7.94(2) GPa by simultaneous single-crystal X-ray diffraction (XRD) and Brillouin spectroscopy at high pressures. The transition appears to be continuous, and it can be described with a second, fourth and six order terms Landau potential. Our results reveal an enhanced unit-cell volume compressibility, which is linked to an increase of the b- and a-axes linear compressibility in the P21nm phase of δ-(Al0.97,Fe0.03)OOH prior to the transition. In addition, we observed the presence of elastic softening in the P21nm phase that mostly impacts the elastic stiffness coefficients c12, c22 and c23. The observed elastic anomalies cause a significant change in the pressure dependence of the adiabatic bulk modulus (KS). These results provide a better understanding of the relation between elasticity, P21mn→Pnnm structural phase transition and hydrogen dynamics in δ-(Al0.97,Fe0.03)OOH, which may be applied to other O-H···O-bearing materials.

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Equation of State and Spin Crossover of (Al, Fe)‐Phase H

Abstract: In Earth's mantle, the volatile element hydrogen is incorporated into minerals as point defects in nominally anhydrous minerals and in the crystal structures of hydrous minerals (e.g.,

Cited by 2 publications

References 114 publications

Hydrogen partitioning between stishovite and hydrous phase δ: implications for water cycle and distribution in the lower mantle

Hydrogen partitioning between stishovite and hydrous phase δ: implications for water cycle and distribution in the lower mantle

Elastic anomalies across the P21nm→Pnnm structural phase transition in δ-(Al,Fe)OOH

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