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

doi:10.1029/GM101p0009

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 proceeding › Chapter

16 Scopus citations

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 language	English (US)
Title of host publication	Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998
Editors	Murli H. Manghnani, Takehiko Yagi
Publisher	Blackwell Publishing Ltd.
Pages	9-16
Number of pages	8
ISBN (Electronic)	9781118664421
ISBN (Print)	9780875900834
DOIs	https://doi.org/10.1029/GM101p0009
State	Published - 1997
Externally published	Yes

Publication series

Name	Geophysical Monograph Series
Volume	101
ISSN (Print)	0065-8448
ISSN (Electronic)	2328-8779

All Science Journal Classification (ASJC) codes

Geophysics

Access to Document

10.1029/GM101p0009

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 M. H. Manghnani, & T. Yagi (Eds.), Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998 (pp. 9-16). (Geophysical Monograph Series; Vol. 101). Blackwell Publishing Ltd.. https://doi.org/10.1029/GM101p0009

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title = "Single-crystal elasticity of the α and β of Mg2SiO4 polymorphs at high pressure",

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{\textquoteleft}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%.",

author = "Zha, {Chang Sheng} and Duffy, {Thomas S.} and Downs, {Robert T.} and Mao, {Ho Kwang} and Hemley, {Russell J.} and Weidner, {Donald J.}",

note = "Publisher Copyright: {\textcopyright} 1998 by the American Geophysical Union.",

year = "1997",

doi = "10.1029/GM101p0009",

language = "English (US)",

isbn = "9780875900834",

series = "Geophysical Monograph Series",

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}

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 MH Manghnani & T Yagi (eds), Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998. Geophysical Monograph Series, vol. 101, Blackwell Publishing Ltd., pp. 9-16. 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. et al.
Properties of Earth and Planetary Materials at High Pressure and Temperature, 1998. ed. / Murli H. Manghnani; Takehiko Yagi. Blackwell Publishing Ltd., 1997. p. 9-16 (Geophysical Monograph Series; Vol. 101).

Research output: Chapter in Book/Report/Conference proceeding › Chapter

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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

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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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