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Title: Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle

Abstract

The effects of the spin transition on the physics and chemistry of the lower-mantle ferropericlase and perovskite have been suggested to have significant consequences on the seismology and geochemistry. Knowing the elasticity of ferropericlase across the spin transition can help explain seismic and mineralogical models of the lower-mantle including the origin of seismic heterogeneities in the middle to lowermost parts of the lower mantle. However, full elastic tensors of ferropericlase within the spin transition and in the low-spin state remains experimentally controversial due to technical challenges in directly measuring sound velocities under lower-mantle conditions. Here we have reliably measured both VP and VS of a single-crystal ferropericlase ((Mg0.92,Fe0.08)O) using complementary Brillouin Light Scattering and Impulsive Stimulated Light Scattering coupled with diamond anvil cell (DAC) up to 96 GPa. The derived elastic tensors show drastically softened C11 and C12 within the spin transition at 40-60 GPa while C44 is not affected. Based on thermoelastic modelling along an expected geotherm, the spin crossover in ferropericlase can contribute to elastic abnormalities at mid lower-mantle conditions. Furthermore, our results imply the middle to lowermost parts of the lower mantle would exhibit enhanced seismic heterogeneities due to the occurrence of the mixed-spin and low-spin ferropericlase.

Authors:
 [1];  [1];  [2];  [3];  [3]
  1. Univ. of Texas, Austin, TX (United States). Department of Geological Sciences, Jackson School of Geosciences
  2. Univ. of Texas, Austin, TX (United States). Department of Geological Sciences, Jackson School of Geosciences; Center for High Pressure Science and Technology Advanced Research, (China)
  3. Institute for Study of the Earth's Interior, Misasa, Tottori (Japan)
Publication Date:
Research Org.:
Univ. of Chicago, Argonne, IL (United States); Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1240833
Alternate Identifier(s):
OSTI ID: 1335494
Grant/Contract Number:  
AC02-06CH11357; NA0002006
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; geophysics; techniques and instrumentation

Citation Formats

Yang, Jing, Tong, Xinyue, Lin, Jung-Fu, Okuchi, Takuo, and Tomioka, Naotaka. Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle. United States: N. p., 2015. Web. doi:10.1038/srep17188.
Yang, Jing, Tong, Xinyue, Lin, Jung-Fu, Okuchi, Takuo, & Tomioka, Naotaka. Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle. United States. https://doi.org/10.1038/srep17188
Yang, Jing, Tong, Xinyue, Lin, Jung-Fu, Okuchi, Takuo, and Tomioka, Naotaka. Tue . "Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle". United States. https://doi.org/10.1038/srep17188. https://www.osti.gov/servlets/purl/1240833.
@article{osti_1240833,
title = {Elasticity of ferropericlase across the spin crossover in the Earth’s lower mantle},
author = {Yang, Jing and Tong, Xinyue and Lin, Jung-Fu and Okuchi, Takuo and Tomioka, Naotaka},
abstractNote = {The effects of the spin transition on the physics and chemistry of the lower-mantle ferropericlase and perovskite have been suggested to have significant consequences on the seismology and geochemistry. Knowing the elasticity of ferropericlase across the spin transition can help explain seismic and mineralogical models of the lower-mantle including the origin of seismic heterogeneities in the middle to lowermost parts of the lower mantle. However, full elastic tensors of ferropericlase within the spin transition and in the low-spin state remains experimentally controversial due to technical challenges in directly measuring sound velocities under lower-mantle conditions. Here we have reliably measured both VP and VS of a single-crystal ferropericlase ((Mg0.92,Fe0.08)O) using complementary Brillouin Light Scattering and Impulsive Stimulated Light Scattering coupled with diamond anvil cell (DAC) up to 96 GPa. The derived elastic tensors show drastically softened C11 and C12 within the spin transition at 40-60 GPa while C44 is not affected. Based on thermoelastic modelling along an expected geotherm, the spin crossover in ferropericlase can contribute to elastic abnormalities at mid lower-mantle conditions. Furthermore, our results imply the middle to lowermost parts of the lower mantle would exhibit enhanced seismic heterogeneities due to the occurrence of the mixed-spin and low-spin ferropericlase.},
doi = {10.1038/srep17188},
journal = {Scientific Reports},
number = ,
volume = 5,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 2015},
month = {Tue Dec 01 00:00:00 EST 2015}
}

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Works referenced in this record:

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Works referencing / citing this record:

Abnormal Elasticity of Fe-Bearing Bridgmanite in the Earth's Lower Mantle
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Elastic Softening of (Mg 0.8 Fe 0.2 )O Ferropericlase Across the Iron Spin Crossover Measured at Seismic Frequencies
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Abnormal Elasticity of Single-Crystal Magnesiosiderite across the Spin Transition in Earth’s Lower Mantle
journal, January 2017