In situ measurements of sound velocities and densities across the orthopyroxene ρarr; high-pressure clinopyroxene transition in MgSiO3 at high pressure

Hui-Chen Kung, Baosheng Li, Takeyuki Uchida, Yanbin Wang, Daniel Neuville, Robert C. Liebermann

Research output: Contribution to journalArticle

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Abstract

Using acoustic measurement interfaced with a large volume multi-anvil apparatus in conjunction with in situ X-radiation techniques, we are able to measure the density and elastic wave velocities (VP and VS) for both ortho- and high-pressure clino-MgSiO3 polymorphs in the same experimental run. The elastic bulk and shear moduli of the unquenchable high-pressure clinoenstatite phase were measured within its stability field for the first time. The measured density contrast associated with the phase transition OEN → HP-CEN is 2.6-2.9% in the pressure of 7-9 GPa, and the corresponding velocity jumps are 3-4% for P waves and 5-6% for S waves. The elastic moduli of the HP-CEN phase are KS=156.7(8) GPa, G = 98.5(4) GPa and their pressure derivatives are KS′=5.5(3) and G′ = 1.5(1) at a pressure of 6.5 GPa, room temperature. In addition, we observed anomalous elastic behavior in orthoenstatite at pressure above 9 GPa at room temperature. Both elastic wave velocities exhibited softening between 9 and 13-14 GPa, which we suggest is associated with a transition to a metastable phase intermediate between OEN and HP-CEN.

Original languageEnglish
Pages (from-to)27-44
Number of pages18
JournalPhysics of the Earth and Planetary Interiors
Volume147
Issue number1
DOIs
Publication statusPublished - 2004 Oct 15

Fingerprint

sound velocity
in situ measurement
acoustic velocity
orthopyroxene
clinopyroxene
elastic wave
elastic waves
wave velocity
enstatite
acoustic measurement
bulk modulus
shear modulus
elastic modulus
room temperature
anvils
phase transition
softening
P waves
S waves
P-wave

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "In situ measurements of sound velocities and densities across the orthopyroxene ρarr; high-pressure clinopyroxene transition in MgSiO3 at high pressure",
abstract = "Using acoustic measurement interfaced with a large volume multi-anvil apparatus in conjunction with in situ X-radiation techniques, we are able to measure the density and elastic wave velocities (VP and VS) for both ortho- and high-pressure clino-MgSiO3 polymorphs in the same experimental run. The elastic bulk and shear moduli of the unquenchable high-pressure clinoenstatite phase were measured within its stability field for the first time. The measured density contrast associated with the phase transition OEN → HP-CEN is 2.6-2.9{\%} in the pressure of 7-9 GPa, and the corresponding velocity jumps are 3-4{\%} for P waves and 5-6{\%} for S waves. The elastic moduli of the HP-CEN phase are KS=156.7(8) GPa, G = 98.5(4) GPa and their pressure derivatives are KS′=5.5(3) and G′ = 1.5(1) at a pressure of 6.5 GPa, room temperature. In addition, we observed anomalous elastic behavior in orthoenstatite at pressure above 9 GPa at room temperature. Both elastic wave velocities exhibited softening between 9 and 13-14 GPa, which we suggest is associated with a transition to a metastable phase intermediate between OEN and HP-CEN.",
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In situ measurements of sound velocities and densities across the orthopyroxene ρarr; high-pressure clinopyroxene transition in MgSiO3 at high pressure. / Kung, Hui-Chen; Li, Baosheng; Uchida, Takeyuki; Wang, Yanbin; Neuville, Daniel; Liebermann, Robert C.

In: Physics of the Earth and Planetary Interiors, Vol. 147, No. 1, 15.10.2004, p. 27-44.

Research output: Contribution to journalArticle

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T1 - In situ measurements of sound velocities and densities across the orthopyroxene ρarr; high-pressure clinopyroxene transition in MgSiO3 at high pressure

AU - Kung, Hui-Chen

AU - Li, Baosheng

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AU - Wang, Yanbin

AU - Neuville, Daniel

AU - Liebermann, Robert C.

PY - 2004/10/15

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