論文

査読有り
2020年10月

Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle

EARTH AND PLANETARY SCIENCE LETTERS
  • Yoshiyuki Okuda
  • ,
  • Kenji Ohta
  • ,
  • Akira Hasegawa
  • ,
  • Takashi Yagi
  • ,
  • Kei Hirose
  • ,
  • Saori I. Kawaguchi
  • ,
  • Yasuo Ohishi

547
開始ページ
116466
終了ページ
116466
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.epsl.2020.116466
出版者・発行元
ELSEVIER

The thermal conductivity of post-perovskite (ppv), the highest-pressure polymorph of MgSiO3 in the Earth's mantle, is one of the most important transport properties for providing better constraints on the temperature profile and dynamics at the core-mantle boundary (CMB). Incorporation of Fe into ppv can affect its conductivity, which has never been experimentally investigated. Here we determined the lattice thermal conductivities of ppv containing 3 mol% and 10 mol% of Fe at high P-T conditions - of pressures up to 149 GPa and 177 GPa, respectively, and temperatures up to 1560 K - by means of the recently developed pulsed light heating thermoreflectance technique combining continuous wave heating lasers. We found that the incorporation of Fe into ppv moderately reduces its lattice thermal conductivity as it increases the Fe content. The bulk conductivity of ppv dominant pyrolite is estimated as 1.5 times higher than that of pyrolite consisting of bridgmanite and ferropericlase in the lower mantle, which agrees with the traditional view that ppv acts as a better heat conductor than bridgmanite in the Earth's lowermost mantle. (C) 2020 Elsevier B.V. All rights reserved.

Web of Science ® 被引用回数 : 1

リンク情報
DOI
https://doi.org/10.1016/j.epsl.2020.116466
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000557762500020&DestApp=WOS_CPL

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