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Title
Japanese:パルス光加熱サーモリフレクタンス法を 用いた高圧力下での下部マントル鉱物の 格子熱伝導率測定 
English:Measurement of Lattice Thermal Conductivity of Lower Mantle Minerals under High Pressures using a Pulsed Light Heating Thermoreflectance Technique 
Author
Japanese: 太田健二, 八木貴志, 廣瀬敬.  
English: Kenji Ohta, Takashi Yagi, Kei HIROSE.  
Language Japanese 
Journal/Book name
Japanese:高圧力の科学と技術 
English: 
Volume, Number, Page vol. 24    no. 2    pp. 118-125
Published date June 7, 2014 
Publisher
Japanese:日本高圧力学会 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://www.jstage.jst.go.jp/browse/jshpreview/-char/ja
 
DOI https://doi.org/10.4131/jshpreview.24.118
Abstract Thermal conductivity of lower mantle minerals is essential for controlling the rate of core heat loss and longterm thermal evolution of the Earth, but it has been poorly constrained at the high pressures of the Earth's lowermost mantle. We have newly developed an apparatus for measuring the thermal diffusivity using a pulsed light heating thermoreflectance technique under high pressure in a diamond anvil cell. The new method enabled us to determine the lattice thermal diffusivity of both MgSiO3 perovskite and post-perovskite, the main constituent of the Earth's lower mantle, at room temperature and at high pressures up to 144 GPa greater than the core-mantle boundary pressure. Lattice thermal conductivity of perovskite-dominant lowermost mantle assemblage obtained in this study is about 11 W･m－1･K－1, while post-perovskite bearing rocks exhibit ～60 higher conductivity. Such perovskite value is comparable to the conventionally assumed lowermost mantle conductivity of 10 W･m－1･K－1.

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