Structure and crystal chemistry of hydrous wadsleyite, Mg1.75SiH0.5O4: possible hydrous magnesium silicate in the mantle transition zone

Kudoh, Yasuhiro; Inoue, Toru; Arashi, H.

doi:10.1007/bf00202032

Cited by 67 publications

(52 citation statements)

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“…The calculated valence sum values for hydrous wadsleyite demonstrate that the O(1) site is assignable to OH in association with vacancies at the Mg sites (Kudoh et al, 1996). The Mg(2) O(1)(= OH) and Mg(3) O(1)(= OH) bond distances are the shortest Mg O bonds in anhydrous wadsleyite, and they also exhibit the largest increase (see ΔD in Table 4).…”

Section: Resultsmentioning

confidence: 90%

Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg1.985Si0.993H0.06O4, synthesized at 13.5 GPa and 1300 °C

Kudoh¹,

Kuribayashi²,

Kagi³

et al. 2006

Journal of Mineralogical and Petrological Sciences

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The crystal structure of a single crystal of synthetic hydrous forsterite, (Mg 1.985 Si 0.993 H 0.06 O 4 ), synthesized at T = 1300 °C and P = 13.5 GPa has been investigated using X ray diffractometry and unpolarized infrared absorption spectroscopy. The data show an Mg atom occupancy of 98.6(2)% at the M(1) site and 99.9(2)% at the M(2) site, indicating that the cation vacancies predominantly occur at the M (1) observed in the IR spectra.

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Section: Resultsmentioning

confidence: 90%

Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg1.985Si0.993H0.06O4, synthesized at 13.5 GPa and 1300 °C

Kudoh¹,

Kuribayashi²,

Kagi³

et al. 2006

Journal of Mineralogical and Petrological Sciences

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“…There are 3 types of Mg sites (M1(4a), M2(4e) and M3(8g)) in wadsleyite. Among them, we consider only M2 and M3 vacancy models, since the M1 vacancy concentration is reported to be significantly low [Kudoh et al, 1996]. Figure 2).…”

Section: Resultsmentioning

confidence: 99%

“…[11] Proton defects in hydrous wadsleyite should be introduced primarily by replacing Mg [Kudoh et al, 1996] . The magnitude of all applied strains was 0.01.…”

Section: Methodsmentioning

confidence: 99%

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First principles investigation of the structural and elastic properties of hydrous wadsleyite under pressure

Tsuchiya

2009

J. Geophys. Res.

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Protons are found to bond to the O1 site to align the OH dipoles along the edges of M3 vacancies. Calculated elastic constants, bulk and shear moduli, are found to decrease almost linearly with increasing water content but to increase linearly with increasing pressure. At 15 GPa and static 0 K condition, incorporation of 3.3 wt % H 2 O into wadsleyite, which corresponds to the maximum solubility of hydrous wadsleyite, reduces V P and V S by about 3.9 and 4.8%, respectively. This indicates that 1 wt % H 2 O hydration of wadsleyite corresponds to the temperature effects on bulk and shear moduli about 430 K (0 GPa) to 340 K (20 GPa) and 350 K (0 GPa) to 290 K (20 GPa), respectively. The transversely isotropic aggregates demonstrate largest positive polarization anisotropy V SH À V SV when the c axis aligns vertically in both dry and wet cases.Citation: Tsuchiya, J., and T. Tsuchiya (2009), First principles investigation of the structural and elastic properties of hydrous wadsleyite under pressure,

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“…We used the hydrous wadsleyite synthesized by Inoue [1994], which is the sample recovered from the same run charge used for a single crystal X-ray study [Kudoh et al, 1996]. The synthesis conditions of the present hydrous wadsleyite are 15.5 GPa, 1300øC and 20 min.…”

Section: Methodsmentioning

confidence: 99%

Compressibility of hydrous wadsleyite (β‐phase) in Mg₂SiO₄ by high pressure X‐ray diffraction

Yusa¹,

Inoue²

1997

Geophysical Research Letters

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Abstract. Isothermal compressibility of hydrous wadsleyite has been measured for the first time by using in-situ X-ray diffraction in a diamond anvil apparatus at pressures up to 8.5 GPa of a sample which was synthesized at 15.5 GPa and 1300øC under hydrous conditions. The hydrous wadsleyite sample included 2.5 q-0.3 wt% of H20 as determined by secondary ion mass spectroscopy. The cell parmeters of the present hydrous wadsleyite are fit to the orthorhombic symmetry within error. The linear compressibilities along a-and c-axes of the present hydrous wadsleyite are very similar to those of the anhydrous wadsleyite, but the liner compressibility along the b-axis of the present hydrous wadsleyite is --15% larger than that of the anhydrous wadsleyite. Consequently, the calculated bulk modulus (K0) is 155 q-2 GPa with the pressure derivative (K•)) fixed to 4.3. This value is 5--11% smaller than that of anhydrous wadsleyite. On the basis of the above result, the seismic discontinuity around 400 km is discussed.

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Structure and crystal chemistry of hydrous wadsleyite, Mg1.75SiH0.5O4: possible hydrous magnesium silicate in the mantle transition zone

Cited by 67 publications

References 18 publications

Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg1.985Si0.993H0.06O4, synthesized at 13.5 GPa and 1300 °C

Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg1.985Si0.993H0.06O4, synthesized at 13.5 GPa and 1300 °C

First principles investigation of the structural and elastic properties of hydrous wadsleyite under pressure

Compressibility of hydrous wadsleyite (β‐phase) in Mg₂SiO₄ by high pressure X‐ray diffraction

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Structure and crystal chemistry of hydrous wadsleyite, Mg1.75SiH0.5O4: possible hydrous magnesium silicate in the mantle transition zone

Cited by 67 publications

References 18 publications

Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg1.985Si0.993H0.06O4, synthesized at 13.5 GPa and 1300 °C

Cation vacancy and possible hydrogen positions in hydrous forsterite, Mg1.985Si0.993H0.06O4, synthesized at 13.5 GPa and 1300 °C

First principles investigation of the structural and elastic properties of hydrous wadsleyite under pressure

Compressibility of hydrous wadsleyite (β‐phase) in Mg2SiO4 by high pressure X‐ray diffraction

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Compressibility of hydrous wadsleyite (β‐phase) in Mg₂SiO₄ by high pressure X‐ray diffraction