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Title: Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics

Abstract

We discuss how iron may critically influence the physical properties and thermochemical structures of Earth’s lower mantle. Its effects on thermal conductivity, with possible consequences on heat transfer and mantle dynamics, however, remain largely unknown. We measured the lattice thermal conductivity of lower-mantle ferropericlase to 120 GPa using the ultrafast optical pump-probe technique in a diamond anvil cell. The thermal conductivity of ferropericlase with 56% iron significantly drops by a factor of 1.8 across the spin transition around 53 GPa, while that with 8–10% iron increases monotonically with pressure, causing an enhanced iron substitution effect in the low-spin state. Combined with bridgmanite data, modeling of our results provides a self-consistent radial profile of lower-mantle thermal conductivity, which is dominated by pressure, temperature, and iron effects, and shows a twofold increase from top to bottom of the lower mantle. Such increase in thermal conductivity may delay the cooling of the core, while its decrease with iron content may enhance the dynamics of large low shear-wave velocity provinces. Our findings further show that, if hot and strongly enriched in iron, the seismic ultralow velocity zones have exceptionally low conductivity, thus delaying their cooling.

Authors:
 [1];  [1];  [1]; ORCiD logo [2]
  1. Academia Sinica, Taipei (Taiwan)
  2. Univ. of Texas, Austin, TX (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
National Science Foundation (NSF)
OSTI Identifier:
1434716
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 115; Journal Issue: 16; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences
Country of Publication:
United States
Language:
ENGLISH
Subject:
58 GEOSCIENCES; ferropericlase; thermal conductivity; geodynamics; large low shear-wave velocity provinces; ultralow velocity zones

Citation Formats

Hsieh, Wen-Pin, Deschamps, Frédéric, Okuchi, Takuo, and Lin, Jung-Fu. Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics. United States: N. p., 2018. Web. doi:10.1073/pnas.1718557115.
Hsieh, Wen-Pin, Deschamps, Frédéric, Okuchi, Takuo, & Lin, Jung-Fu. Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics. United States. doi:10.1073/pnas.1718557115.
Hsieh, Wen-Pin, Deschamps, Frédéric, Okuchi, Takuo, and Lin, Jung-Fu. Mon . "Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics". United States. doi:10.1073/pnas.1718557115. https://www.osti.gov/servlets/purl/1434716.
@article{osti_1434716,
title = {Effects of iron on the lattice thermal conductivity of Earth’s deep mantle and implications for mantle dynamics},
author = {Hsieh, Wen-Pin and Deschamps, Frédéric and Okuchi, Takuo and Lin, Jung-Fu},
abstractNote = {We discuss how iron may critically influence the physical properties and thermochemical structures of Earth’s lower mantle. Its effects on thermal conductivity, with possible consequences on heat transfer and mantle dynamics, however, remain largely unknown. We measured the lattice thermal conductivity of lower-mantle ferropericlase to 120 GPa using the ultrafast optical pump-probe technique in a diamond anvil cell. The thermal conductivity of ferropericlase with 56% iron significantly drops by a factor of 1.8 across the spin transition around 53 GPa, while that with 8–10% iron increases monotonically with pressure, causing an enhanced iron substitution effect in the low-spin state. Combined with bridgmanite data, modeling of our results provides a self-consistent radial profile of lower-mantle thermal conductivity, which is dominated by pressure, temperature, and iron effects, and shows a twofold increase from top to bottom of the lower mantle. Such increase in thermal conductivity may delay the cooling of the core, while its decrease with iron content may enhance the dynamics of large low shear-wave velocity provinces. Our findings further show that, if hot and strongly enriched in iron, the seismic ultralow velocity zones have exceptionally low conductivity, thus delaying their cooling.},
doi = {10.1073/pnas.1718557115},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
issn = {0027-8424},
number = 16,
volume = 115,
place = {United States},
year = {2018},
month = {4}
}

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Cited by: 9 works
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