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

Alexander F. Goncharov, Sergey S. Lobanov, Xiaojing Tan, Gregory T. Hohensee, David G. Cahill, Jung Fu Lin, Sylvia Monique Thomas, Takuo Okuchi, Naotaka Tomioka

Research output: Contribution to journalArticle

19 Citations (Scopus)

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- have been measured at room temperature up to 30 and 46GPa, 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 Mg0.9Fe0.1O 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(1)%/GPa). The radiative conductivity of a Mg0.94Fe0.06SiO3 bridgmanite single crystal agrees with previously determined values for powder samples at ambient pressure; it is almost pressure-independent in the investigated pressure range. 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.

Original languageEnglish
Pages (from-to)11-16
Number of pages6
JournalPhysics of the Earth and Planetary Interiors
Volume247
DOIs
Publication statusPublished - Aug 25 2014

Fingerprint

thermal conductivity
experimental study
lower mantle
Earth mantle
conductivity
minerals
core-mantle boundary
diamond anvil cell
perovskite
mineral
anvils
in situ measurement
heat transmission
heat flow
magnesium
silicates
silicate
temperature
diamonds
spectroscopy

Keywords

  • Bridgmanite
  • Deep Earth's minerals
  • Ferropericlase
  • High pressure
  • Lattice thermal conductivity
  • Lower mantle
  • Optical properties
  • Radiative conductivity
  • Thermal conductivity

ASJC Scopus subject areas

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

Cite this

Goncharov, A. F., Lobanov, S. S., Tan, X., Hohensee, G. T., Cahill, D. G., Lin, J. F., ... Tomioka, N. (2014). Experimental study of thermal conductivity at high pressures: Implications for the deep Earth's interior. Physics of the Earth and Planetary Interiors, 247, 11-16. https://doi.org/10.1016/j.pepi.2015.02.004

Experimental study of thermal conductivity at high pressures : Implications for the deep Earth's interior. / Goncharov, Alexander F.; Lobanov, Sergey S.; Tan, Xiaojing; Hohensee, Gregory T.; Cahill, David G.; Lin, Jung Fu; Thomas, Sylvia Monique; Okuchi, Takuo; Tomioka, Naotaka.

In: Physics of the Earth and Planetary Interiors, Vol. 247, 25.08.2014, p. 11-16.

Research output: Contribution to journalArticle

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. In: Physics of the Earth and Planetary Interiors. 2014 ; Vol. 247. pp. 11-16.
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