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Title: High-Pressure Single-Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior

Abstract

Omphacite is a major mineral phase of eclogite, which provides the main driving force for the slab subduction into the Earth's interior. We have measured the single-crystal elastic moduli of omphacite at high pressures for the first time up to 18 GPa at ambient temperature using Brillouin spectroscopy. A least squares fit of the velocity-pressure data to the third-order finite strain equation of state yields KS0' = 4.5 (3), G0' = 1.6 (1) with ρ0 = 3.34 (1) g/cm3, KS0 = 123 (3) GPa, and G0 = 74 (2) GPa. In addition, the synchrotron single-crystal X-ray diffraction data have been collected up to 18 GPa and 700 K. The fitting to Holland-Powell thermal-pressure equation of state yields KT0' = 4.6 (5) and α0 = 2.7 (8) × 10-5 K-1. Based on the obtained thermoelastic parameters of omphacite, the anisotropic seismic velocities of eclogite are modeled and compared with pyrolite between 200 and 500 km. The largest contrast between the eclogite and pyrolite in terms of seismic properties is observed between ~310 and 410 km.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2];  [1]; ORCiD logo [3]
  1. Univ. of New Mexico, Albuquerque, NM (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States); Albuquerque High School, NM (United States)
  3. Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF)
OSTI Identifier:
1610257
Alternate Identifier(s):
OSTI ID: 1497736
Grant/Contract Number:  
FG02-94ER14466; AC02-06CH11357; EAR-1646527; EAR-1661511; EAR‐1634415; AC02‐06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
Journal Volume: 124; Journal Issue: 3; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; elasticity; anisotropy; omphacite; eclogite

Citation Formats

Hao, Ming, Zhang, Jin S., Pierotti, Caroline E., Ren, Zhiyuan, and Zhang, D. High-Pressure Single-Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior. United States: N. p., 2019. Web. doi:10.1029/2018jb016964.
Hao, Ming, Zhang, Jin S., Pierotti, Caroline E., Ren, Zhiyuan, & Zhang, D. High-Pressure Single-Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior. United States. https://doi.org/10.1029/2018jb016964
Hao, Ming, Zhang, Jin S., Pierotti, Caroline E., Ren, Zhiyuan, and Zhang, D. Fri . "High-Pressure Single-Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior". United States. https://doi.org/10.1029/2018jb016964. https://www.osti.gov/servlets/purl/1610257.
@article{osti_1610257,
title = {High-Pressure Single-Crystal Elasticity and Thermal Equation of State of Omphacite and Their Implications for the Seismic Properties of Eclogite in the Earth's Interior},
author = {Hao, Ming and Zhang, Jin S. and Pierotti, Caroline E. and Ren, Zhiyuan and Zhang, D.},
abstractNote = {Omphacite is a major mineral phase of eclogite, which provides the main driving force for the slab subduction into the Earth's interior. We have measured the single-crystal elastic moduli of omphacite at high pressures for the first time up to 18 GPa at ambient temperature using Brillouin spectroscopy. A least squares fit of the velocity-pressure data to the third-order finite strain equation of state yields KS0' = 4.5 (3), G0' = 1.6 (1) with ρ0 = 3.34 (1) g/cm3, KS0 = 123 (3) GPa, and G0 = 74 (2) GPa. In addition, the synchrotron single-crystal X-ray diffraction data have been collected up to 18 GPa and 700 K. The fitting to Holland-Powell thermal-pressure equation of state yields KT0' = 4.6 (5) and α0 = 2.7 (8) × 10-5 K-1. Based on the obtained thermoelastic parameters of omphacite, the anisotropic seismic velocities of eclogite are modeled and compared with pyrolite between 200 and 500 km. The largest contrast between the eclogite and pyrolite in terms of seismic properties is observed between ~310 and 410 km.},
doi = {10.1029/2018jb016964},
journal = {Journal of Geophysical Research. Solid Earth},
number = 3,
volume = 124,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 2019},
month = {Fri Feb 01 00:00:00 EST 2019}
}

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Works referencing / citing this record:

Hydrogen Effect on the Sound Velocities of Upper Mantle Omphacite
journal, November 2019