Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure

Chang Sheng Zha, Thomas S. Duffy, Robert T Downs, Ho Kwang Mao, Russell J. Hemley, Donald J. Weidner

Research output: Chapter in Book/Report/Conference proceedingChapter

10 Citations (Scopus)

Abstract

The full set of single-crystal elastic moduli of forsterite (α-Mg2SiO4) and wadsleyite (β-Mg2SiO4) were measured at pressures of 3-16 GPa and 0-14 GPa, respectively. For forsterite, the pressure derivatives of the bulk (K0‘s) and shear (G0') modulus are 4.2 ± 0.2 and 1.4 ± 0.1, respectively. For wadsleyite, the corresponding pressure derivatives are 4.3 ± 0.2 and 1.4 ± 0.2. These values are much lower than those reported in earlier, low-pressure studies for both materials. At the pressure of the 410-km seismic discontinuity, the room-temperature velocity increase across the a-p transition is 9.8% for compressional waves and 12.4% for shear waves. The results are consistent with an olivine fraction in the upper mantle of 30-50%.

Original languageEnglish (US)
Title of host publicationProperties of Earth and Planetary Materials at High Pressure and Temperature, 1998
PublisherBlackwell Publishing Ltd
Pages9-16
Number of pages8
Volume101
ISBN (Electronic)9781118664421
ISBN (Print)9780875900834
DOIs
StatePublished - Jan 1 1997
Externally publishedYes

Publication series

NameGeophysical Monograph Series
Volume101
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

Fingerprint

elasticity
elastic properties
wadsleyite
crystal
forsterite
single crystals
shear modulus
elastic modulus
olivine
S waves
low pressure
S-wave
upper mantle
modulus of elasticity
discontinuity
Earth mantle
shear
room temperature
temperature

ASJC Scopus subject areas

  • Geophysics

Cite this

Zha, C. S., Duffy, T. S., Downs, R. T., Mao, H. K., Hemley, R. J., & Weidner, D. J. (1997). Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure. In Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998 (Vol. 101, pp. 9-16). (Geophysical Monograph Series; Vol. 101). Blackwell Publishing Ltd. https://doi.org/10.1029/GM101p0009

Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure. / Zha, Chang Sheng; Duffy, Thomas S.; Downs, Robert T; Mao, Ho Kwang; Hemley, Russell J.; Weidner, Donald J.

Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998. Vol. 101 Blackwell Publishing Ltd, 1997. p. 9-16 (Geophysical Monograph Series; Vol. 101).

Research output: Chapter in Book/Report/Conference proceedingChapter

Zha, CS, Duffy, TS, Downs, RT, Mao, HK, Hemley, RJ & Weidner, DJ 1997, Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure. in Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998. vol. 101, Geophysical Monograph Series, vol. 101, Blackwell Publishing Ltd, pp. 9-16. https://doi.org/10.1029/GM101p0009
Zha CS, Duffy TS, Downs RT, Mao HK, Hemley RJ, Weidner DJ. Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure. In Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998. Vol. 101. Blackwell Publishing Ltd. 1997. p. 9-16. (Geophysical Monograph Series). https://doi.org/10.1029/GM101p0009
Zha, Chang Sheng ; Duffy, Thomas S. ; Downs, Robert T ; Mao, Ho Kwang ; Hemley, Russell J. ; Weidner, Donald J. / Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure. Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998. Vol. 101 Blackwell Publishing Ltd, 1997. pp. 9-16 (Geophysical Monograph Series).
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abstract = "The full set of single-crystal elastic moduli of forsterite (α-Mg2SiO4) and wadsleyite (β-Mg2SiO4) were measured at pressures of 3-16 GPa and 0-14 GPa, respectively. For forsterite, the pressure derivatives of the bulk (K0‘s) and shear (G0') modulus are 4.2 ± 0.2 and 1.4 ± 0.1, respectively. For wadsleyite, the corresponding pressure derivatives are 4.3 ± 0.2 and 1.4 ± 0.2. These values are much lower than those reported in earlier, low-pressure studies for both materials. At the pressure of the 410-km seismic discontinuity, the room-temperature velocity increase across the a-p transition is 9.8{\%} for compressional waves and 12.4{\%} for shear waves. The results are consistent with an olivine fraction in the upper mantle of 30-50{\%}.",
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T1 - Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure

AU - Zha, Chang Sheng

AU - Duffy, Thomas S.

AU - Downs, Robert T

AU - Mao, Ho Kwang

AU - Hemley, Russell J.

AU - Weidner, Donald J.

PY - 1997/1/1

Y1 - 1997/1/1

N2 - The full set of single-crystal elastic moduli of forsterite (α-Mg2SiO4) and wadsleyite (β-Mg2SiO4) were measured at pressures of 3-16 GPa and 0-14 GPa, respectively. For forsterite, the pressure derivatives of the bulk (K0‘s) and shear (G0') modulus are 4.2 ± 0.2 and 1.4 ± 0.1, respectively. For wadsleyite, the corresponding pressure derivatives are 4.3 ± 0.2 and 1.4 ± 0.2. These values are much lower than those reported in earlier, low-pressure studies for both materials. At the pressure of the 410-km seismic discontinuity, the room-temperature velocity increase across the a-p transition is 9.8% for compressional waves and 12.4% for shear waves. The results are consistent with an olivine fraction in the upper mantle of 30-50%.

AB - The full set of single-crystal elastic moduli of forsterite (α-Mg2SiO4) and wadsleyite (β-Mg2SiO4) were measured at pressures of 3-16 GPa and 0-14 GPa, respectively. For forsterite, the pressure derivatives of the bulk (K0‘s) and shear (G0') modulus are 4.2 ± 0.2 and 1.4 ± 0.1, respectively. For wadsleyite, the corresponding pressure derivatives are 4.3 ± 0.2 and 1.4 ± 0.2. These values are much lower than those reported in earlier, low-pressure studies for both materials. At the pressure of the 410-km seismic discontinuity, the room-temperature velocity increase across the a-p transition is 9.8% for compressional waves and 12.4% for shear waves. The results are consistent with an olivine fraction in the upper mantle of 30-50%.

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