Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

Steven D. Jacobsen; Joseph R. Smyth; Hartmut Spetzler; Christopher M. Holl; Daniel J. Frost

doi:10.1016/j.pepi.2003.07.019

Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

Steven D. Jacobsen^*, Joseph R. Smyth, Hartmut Spetzler, Christopher M. Holl, Daniel J. Frost

^*Corresponding author for this work

Earth and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

142 Scopus citations

Abstract

The sound velocities and single-crystal elastic constants of Fo₈₉ hydrous ringwoodite (γ-Mg_1.7 Fe_0.22H_0.16SiO₄) containing ∼10,000 ppm by weight (1 wt.%) H₂O have been determined from seven separate pure-mode travel-time measurements using gigahertz ultrasonic interferometry. The experiments feature a new Yttrium-Aluminum- Garnet (YAG) P-to-S conversion shear buffer rod (BR), capable of producing pure ultrasonic shear waves with known polarization in the region of 0.5-2.0 GHz. To our knowledge they are the first such single-crystal ultrasonic measurements on a high-pressure phase recovered from the multi-anvil press. The cubic single-crystal elastic constants of hydrous Fo₈₉ ringwoodite at ambient conditions are (in GPa): c₁₁ = 298 ± 13, c₄₄ = 112 ± 6, and c₁₂ = 115 ± 6. Hydration of Fo_∼90 ringwoodite to 1 wt.% H₂O reduces the adiabatic bulk (K_0S = 176 ± 7 GPa) and shear (G = 103 ± 5 GPa) moduli by about 6 and 13%, roughly equivalent to raising the temperature at room pressure by 600 and 1000 °C, respectively. Assuming a linear trend with hydration, we calculate that P- and S-wave velocities are reduced by about 40 m/s for every 1000 ppm weight (0.1 wt.%) H₂O added to Fo_∼90 ringwoodite. P- and S-wave velocities of the lower transition zone in PREM are consistent with a hydrated ringwoodite-rich composition.

Original language	English (US)
Pages (from-to)	47-56
Number of pages	10
Journal	Physics of the Earth and Planetary Interiors
Volume	143
Issue number	1-2
DOIs	https://doi.org/10.1016/j.pepi.2003.07.019
State	Published - Jun 15 2004

Funding

We wish to thank H. Schulze, K. Müller, H. Ohlmeyer, and G. Herrmannsdörfer, S. Linhardt, K. Hain, and K. Klasinski for their technical assistance in construction of the P-to-S conversion buffer rods, high-frequency electronics, and data reduction routines. G. Bromiley assisted with the FTIR measurements. The helpful comments of A. Yoneda and an anonymous reviewer are appreciated. This study was made possible by an Alexander von Humboldt Fellowship to S.D.J. and by the Bayerisches Geoinstitut Visitor Program to J.R.S.

Keywords

Elastic properties
Gigahertz ultrasonic interferometry
Hydrogen in the transition zone
Hydrous ringwoodite

ASJC Scopus subject areas

Astronomy and Astrophysics
Geophysics
Physics and Astronomy (miscellaneous)
Space and Planetary Science

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10.1016/j.pepi.2003.07.019

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@article{6efdb3e2caf642aa946f294b732fc289,

title = "Sound velocities and elastic constants of iron-bearing hydrous ringwoodite",

abstract = "The sound velocities and single-crystal elastic constants of Fo89 hydrous ringwoodite (γ-Mg1.7 Fe0.22H0.16SiO4) containing ∼10,000 ppm by weight (1 wt.%) H2O have been determined from seven separate pure-mode travel-time measurements using gigahertz ultrasonic interferometry. The experiments feature a new Yttrium-Aluminum- Garnet (YAG) P-to-S conversion shear buffer rod (BR), capable of producing pure ultrasonic shear waves with known polarization in the region of 0.5-2.0 GHz. To our knowledge they are the first such single-crystal ultrasonic measurements on a high-pressure phase recovered from the multi-anvil press. The cubic single-crystal elastic constants of hydrous Fo89 ringwoodite at ambient conditions are (in GPa): c11 = 298 ± 13, c44 = 112 ± 6, and c12 = 115 ± 6. Hydration of Fo∼90 ringwoodite to 1 wt.% H2O reduces the adiabatic bulk (K0S = 176 ± 7 GPa) and shear (G = 103 ± 5 GPa) moduli by about 6 and 13%, roughly equivalent to raising the temperature at room pressure by 600 and 1000 °C, respectively. Assuming a linear trend with hydration, we calculate that P- and S-wave velocities are reduced by about 40 m/s for every 1000 ppm weight (0.1 wt.%) H2O added to Fo∼90 ringwoodite. P- and S-wave velocities of the lower transition zone in PREM are consistent with a hydrated ringwoodite-rich composition.",

keywords = "Elastic properties, Gigahertz ultrasonic interferometry, Hydrogen in the transition zone, Hydrous ringwoodite",

author = "Jacobsen, {Steven D.} and Smyth, {Joseph R.} and Hartmut Spetzler and Holl, {Christopher M.} and Frost, {Daniel J.}",

note = "Funding Information: We wish to thank H. Schulze, K. M{\"u}ller, H. Ohlmeyer, and G. Herrmannsd{\"o}rfer, S. Linhardt, K. Hain, and K. Klasinski for their technical assistance in construction of the P-to-S conversion buffer rods, high-frequency electronics, and data reduction routines. G. Bromiley assisted with the FTIR measurements. The helpful comments of A. Yoneda and an anonymous reviewer are appreciated. This study was made possible by an Alexander von Humboldt Fellowship to S.D.J. and by the Bayerisches Geoinstitut Visitor Program to J.R.S.",

year = "2004",

month = jun,

day = "15",

doi = "10.1016/j.pepi.2003.07.019",

language = "English (US)",

volume = "143",

pages = "47--56",

journal = "Physics of the Earth and Planetary Interiors",

issn = "0031-9201",

publisher = "Elsevier B.V.",

number = "1-2",

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TY - JOUR

T1 - Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

AU - Jacobsen, Steven D.

AU - Smyth, Joseph R.

AU - Spetzler, Hartmut

AU - Holl, Christopher M.

AU - Frost, Daniel J.

N1 - Funding Information: We wish to thank H. Schulze, K. Müller, H. Ohlmeyer, and G. Herrmannsdörfer, S. Linhardt, K. Hain, and K. Klasinski for their technical assistance in construction of the P-to-S conversion buffer rods, high-frequency electronics, and data reduction routines. G. Bromiley assisted with the FTIR measurements. The helpful comments of A. Yoneda and an anonymous reviewer are appreciated. This study was made possible by an Alexander von Humboldt Fellowship to S.D.J. and by the Bayerisches Geoinstitut Visitor Program to J.R.S.

PY - 2004/6/15

Y1 - 2004/6/15

N2 - The sound velocities and single-crystal elastic constants of Fo89 hydrous ringwoodite (γ-Mg1.7 Fe0.22H0.16SiO4) containing ∼10,000 ppm by weight (1 wt.%) H2O have been determined from seven separate pure-mode travel-time measurements using gigahertz ultrasonic interferometry. The experiments feature a new Yttrium-Aluminum- Garnet (YAG) P-to-S conversion shear buffer rod (BR), capable of producing pure ultrasonic shear waves with known polarization in the region of 0.5-2.0 GHz. To our knowledge they are the first such single-crystal ultrasonic measurements on a high-pressure phase recovered from the multi-anvil press. The cubic single-crystal elastic constants of hydrous Fo89 ringwoodite at ambient conditions are (in GPa): c11 = 298 ± 13, c44 = 112 ± 6, and c12 = 115 ± 6. Hydration of Fo∼90 ringwoodite to 1 wt.% H2O reduces the adiabatic bulk (K0S = 176 ± 7 GPa) and shear (G = 103 ± 5 GPa) moduli by about 6 and 13%, roughly equivalent to raising the temperature at room pressure by 600 and 1000 °C, respectively. Assuming a linear trend with hydration, we calculate that P- and S-wave velocities are reduced by about 40 m/s for every 1000 ppm weight (0.1 wt.%) H2O added to Fo∼90 ringwoodite. P- and S-wave velocities of the lower transition zone in PREM are consistent with a hydrated ringwoodite-rich composition.

AB - The sound velocities and single-crystal elastic constants of Fo89 hydrous ringwoodite (γ-Mg1.7 Fe0.22H0.16SiO4) containing ∼10,000 ppm by weight (1 wt.%) H2O have been determined from seven separate pure-mode travel-time measurements using gigahertz ultrasonic interferometry. The experiments feature a new Yttrium-Aluminum- Garnet (YAG) P-to-S conversion shear buffer rod (BR), capable of producing pure ultrasonic shear waves with known polarization in the region of 0.5-2.0 GHz. To our knowledge they are the first such single-crystal ultrasonic measurements on a high-pressure phase recovered from the multi-anvil press. The cubic single-crystal elastic constants of hydrous Fo89 ringwoodite at ambient conditions are (in GPa): c11 = 298 ± 13, c44 = 112 ± 6, and c12 = 115 ± 6. Hydration of Fo∼90 ringwoodite to 1 wt.% H2O reduces the adiabatic bulk (K0S = 176 ± 7 GPa) and shear (G = 103 ± 5 GPa) moduli by about 6 and 13%, roughly equivalent to raising the temperature at room pressure by 600 and 1000 °C, respectively. Assuming a linear trend with hydration, we calculate that P- and S-wave velocities are reduced by about 40 m/s for every 1000 ppm weight (0.1 wt.%) H2O added to Fo∼90 ringwoodite. P- and S-wave velocities of the lower transition zone in PREM are consistent with a hydrated ringwoodite-rich composition.

KW - Elastic properties

KW - Gigahertz ultrasonic interferometry

KW - Hydrogen in the transition zone

KW - Hydrous ringwoodite

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DO - 10.1016/j.pepi.2003.07.019

M3 - Article

AN - SCOPUS:2442593617

SN - 0031-9201

VL - 143

SP - 47

EP - 56

JO - Physics of the Earth and Planetary Interiors

JF - Physics of the Earth and Planetary Interiors

IS - 1-2

ER -

Sound velocities and elastic constants of iron-bearing hydrous ringwoodite

Abstract

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Keywords

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