DOI: 10.1029/98jb01819. Sound velocities and elastic properties of Fe‐bearing wadsleyite and ringwoodite

Sound velocities and elastic properties of Fe‐bearing wadsleyite and ringwoodite

10.1029/98jb01819

Crossref journal-article

American Geophysical Union (AGU)

Journal of Geophysical Research: Solid Earth (13)

Abstract

The sound velocities and single‐crystal elastic moduli of β phase (wadsleyite) and γ phase (ringwoodite) of (Mg,Fe)2SiO4 with Fe/(Fe+Mg) ratios of ∼0.075 and ∼0.09, respectively, have been determined at ambient conditions by Brillouin spectroscopy. Both compressional and shear wave aggregate velocities decrease with increasing Fe content in both phases, but the magnitude of this decrease is different for the two phases. The adiabatic bulk modulus, Ks, of Fe;‐bearing β‐Mg2SiO4 (Ks = 170±2 GPa) is indistinguishable from that of the Mg end‐member within experimental uncertainty, whereas Ks of γ‐(Mg,Fe)2SiO4 increases rapidly with increasing iron content. The shear moduli of both phases decrease with increasing Fe content. Our measurements indicate that the velocity and impedance contrasts between olivine and β‐(Mg,Fe)2SiO4 are independent of Fe content for Mg‐rich compositions, but the contrast for the β → γ‐(Mg,Fe)2SiO4 transition increases significantly with increasing Fe content. The new data support a previous estimate of 40±10% for the olivine content of the upper mantle and suggest that less than 50% (Mg,Fe)2SiO4 is sufficient to account for the observed impedance contrasts at depths of both 410 km and 520 km. Unless the effect of Fe on elastic properties is accounted for, it is difficult to account for both the 410 and 520 km discontinuities with a single olivine content.

Bibliography

Sinogeikin, S. V., Katsura, T., & Bass, J. D. (1998). Sound velocities and elastic properties of Feâbearing wadsleyite and ringwoodite. Journal of Geophysical Research: Solid Earth, 103(B9), 20819â20825. Portico.

Authors 3

S. V. Sinogeikin (first)
T. Katsura (additional)
J. D. Bass (additional)

References 35 Referenced 130

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Dates

Type	When
Created	22 years, 11 months ago (Sept. 17, 2002, 6:30 p.m.)
Deposited	1 year, 11 months ago (Sept. 22, 2023, 9:08 p.m.)
Indexed	2 months, 2 weeks ago (June 7, 2025, 4:26 p.m.)
Issued	26 years, 11 months ago (Sept. 10, 1998)
Published	26 years, 11 months ago (Sept. 10, 1998)
Published Online	26 years, 11 months ago (Sept. 10, 1998)
Published Print	26 years, 11 months ago (Sept. 10, 1998)

Funders 0

None

BibTeX

@article{Sinogeikin_1998, title={Sound velocities and elastic properties of Fe‐bearing wadsleyite and ringwoodite}, volume={103}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/98jb01819}, DOI={10.1029/98jb01819}, number={B9}, journal={Journal of Geophysical Research: Solid Earth}, publisher={American Geophysical Union (AGU)}, author={Sinogeikin, S. V. and Katsura, T. and Bass, J. D.}, year={1998}, month=sep, pages={20819–20825} }

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  "abstract": "<jats:p>The sound velocities and single\u2010crystal elastic moduli of \u03b2 phase (wadsleyite) and \u03b3 phase (ringwoodite) of (Mg,Fe)<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> with Fe/(Fe+Mg) ratios of \u223c0.075 and \u223c0.09, respectively, have been determined at ambient conditions by Brillouin spectroscopy. Both compressional and shear wave aggregate velocities decrease with increasing Fe content in both phases, but the magnitude of this decrease is different for the two phases. The adiabatic bulk modulus, <jats:italic>K<jats:sub>s</jats:sub></jats:italic>, of Fe;\u2010bearing \u03b2\u2010Mg<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> (<jats:italic>K<jats:sub>s</jats:sub></jats:italic> = 170\u00b12 GPa) is indistinguishable from that of the Mg end\u2010member within experimental uncertainty, whereas <jats:italic>K<jats:sub>s</jats:sub></jats:italic> of \u03b3\u2010(Mg,Fe)<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> increases rapidly with increasing iron content. The shear moduli of both phases decrease with increasing Fe content. Our measurements indicate that the velocity and impedance contrasts between olivine and \u03b2\u2010(Mg,Fe)<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> are independent of Fe content for Mg\u2010rich compositions, but the contrast for the \u03b2 \u2192 \u03b3\u2010(Mg,Fe)<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> transition increases significantly with increasing Fe content. The new data support a previous estimate of 40\u00b110% for the olivine content of the upper mantle and suggest that less than 50% (Mg,Fe)<jats:sub>2</jats:sub>SiO<jats:sub>4</jats:sub> is sufficient to account for the observed impedance contrasts at depths of both 410 km and 520 km. Unless the effect of Fe on elastic properties is accounted for, it is difficult to account for both the 410 and 520 km discontinuities with a single olivine content.</jats:p>",
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