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Title: Experimental study of thermal conductivity at high pressures: Implications for the deep Earth’s interior

Abstract

Lattice thermal conductivity of ferropericlase and radiative thermal conductivity of iron bearing magnesium silicate perovskite (bridgmanite) – the major mineral of Earth’s lower mantle– has been measured at room temperature up to 30 and 46 GPa, respectively, using time domain thermoreflectance and optical spectroscopy techniques in diamond anvil cells. The results provide new constraints for the pressure dependencies of the thermal conductivities of Fe bearing minerals. The lattice thermal conductivity of ferropericlase (Mg 0.9Fe 0.1)O is 5.7(6) W/(m*K) at ambient conditions, which is almost 10 times smaller than that of pure MgO; however, it increases with pressure much faster (6.1(7)%/GPa vs 3.6%/GPa). The radiative conductivity of Mg 0.94Fe 0.06SiO 3 bridgmanite single crystal agrees with previously determined values at ambient pressure; it is almost pressure-independent in the investigated pressure range. Furthermore, our results confirm the reduced radiative conductivity scenario for the Earth’s lower mantle, while the assessment of the heat flow through the core-mantle boundary still requires in situ measurements at the relevant pressure-temperature conditions.

Authors:
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7];  [7]
  1. Carnegie Institution of Washington, Washington, D.C. (United States); Chinese Academy of Sciences, Anhui (China)
  2. Carnegie Institution of Washington, Washington, D.C. (United States); V.S. Sobolev Institute of Geology and Mineralogy, Novosibirsk (Russia)
  3. Carnegie Institution of Washington, Washington, D.C. (United States)
  4. Univ. of Illinois, Urbana, IL (United States)
  5. The Univ. of Texas at Austin, Austin, TX (United States)
  6. Univ. of Nevada, Las Vegas, NV (United States)
  7. Okayama Univ., Tottori (Japan)
Publication Date:
Research Org.:
Carnegie Institution of Washington, Washington, D.C. (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1335450
Grant/Contract Number:  
NA0002006
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of the Earth and Planetary Interiors
Additional Journal Information:
Journal Volume: 247; Journal Issue: C; Journal ID: ISSN 0031-9201
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; thermal conductivity; deep Earth’s minerals; high pressure; bridgmanite; ferropericlase; radiative conductivity; optical properties; lower mantle; lattice thermal conductivity

Citation Formats

Goncharov, Alexander F., Lobanov, Sergey S., Tan, Xiaojing, Hohensee, Gregory T., Cahill, David G., Lin, Jung -Fu, Thomas, Sylvia -Monique, Okuchi, Takuo, and Tomioka, Naotaka. Experimental study of thermal conductivity at high pressures: Implications for the deep Earth’s interior. United States: N. p., 2015. Web. doi:10.1016/j.pepi.2015.02.004.
Goncharov, Alexander F., Lobanov, Sergey S., Tan, Xiaojing, Hohensee, Gregory T., Cahill, David G., Lin, Jung -Fu, Thomas, Sylvia -Monique, Okuchi, Takuo, & Tomioka, Naotaka. Experimental study of thermal conductivity at high pressures: Implications for the deep Earth’s interior. United States. doi:10.1016/j.pepi.2015.02.004.
Goncharov, Alexander F., Lobanov, Sergey S., Tan, Xiaojing, Hohensee, Gregory T., Cahill, David G., Lin, Jung -Fu, Thomas, Sylvia -Monique, Okuchi, Takuo, and Tomioka, Naotaka. Tue . "Experimental study of thermal conductivity at high pressures: Implications for the deep Earth’s interior". United States. doi:10.1016/j.pepi.2015.02.004. https://www.osti.gov/servlets/purl/1335450.
@article{osti_1335450,
title = {Experimental study of thermal conductivity at high pressures: Implications for the deep Earth’s interior},
author = {Goncharov, Alexander F. and Lobanov, Sergey S. and Tan, Xiaojing and Hohensee, Gregory T. and Cahill, David G. and Lin, Jung -Fu and Thomas, Sylvia -Monique and Okuchi, Takuo and Tomioka, Naotaka},
abstractNote = {Lattice thermal conductivity of ferropericlase and radiative thermal conductivity of iron bearing magnesium silicate perovskite (bridgmanite) – the major mineral of Earth’s lower mantle– has been measured at room temperature up to 30 and 46 GPa, respectively, using time domain thermoreflectance and optical spectroscopy techniques in diamond anvil cells. The results provide new constraints for the pressure dependencies of the thermal conductivities of Fe bearing minerals. The lattice thermal conductivity of ferropericlase (Mg0.9Fe0.1)O is 5.7(6) W/(m*K) at ambient conditions, which is almost 10 times smaller than that of pure MgO; however, it increases with pressure much faster (6.1(7)%/GPa vs 3.6%/GPa). The radiative conductivity of Mg0.94Fe0.06SiO3 bridgmanite single crystal agrees with previously determined values at ambient pressure; it is almost pressure-independent in the investigated pressure range. Furthermore, our results confirm the reduced radiative conductivity scenario for the Earth’s lower mantle, while the assessment of the heat flow through the core-mantle boundary still requires in situ measurements at the relevant pressure-temperature conditions.},
doi = {10.1016/j.pepi.2015.02.004},
journal = {Physics of the Earth and Planetary Interiors},
number = C,
volume = 247,
place = {United States},
year = {Tue Feb 24 00:00:00 EST 2015},
month = {Tue Feb 24 00:00:00 EST 2015}
}

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