globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116466
论文题名:
Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle
作者: Okuda Y.; Ohta K.; Hasegawa A.; Yagi T.; Hirose K.; Kawaguchi S.I.; Ohishi Y.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547
语种: 英语
中文关键词: core-mantle boundary ; post-perovskite ; pulsed light heating thermoreflectance technique ; thermal conductivity
英文关键词: Continuous wave lasers ; Crystal lattices ; Iron ; Magnesium compounds ; Perovskite ; Silicon compounds ; Structural geology ; Bulk conductivities ; Continuous Wave ; Core-mantle boundary ; Heat conductors ; Lattice thermal conductivity ; Lowermost mantle ; Temperature profiles ; Thermoreflectance ; Thermal conductivity ; crystal property ; heating ; iron ; lattice dynamics ; lower mantle ; P-T conditions ; perovskite ; pyrolite ; thermal conductivity
英文摘要: 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. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165192
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作者单位: Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Tokyo, 152-8551, Japan; National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8563, Japan; Department of Earth and Planetary Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan; Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo, 152-8551, Japan; Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan

Recommended Citation:
Okuda Y.,Ohta K.,Hasegawa A.,et al. Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle[J]. Earth and Planetary Science Letters,2020-01-01,547
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