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DOI	10.1016/j.epsl.2020.116466
	Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle
	Okuda Y.; Ohta K.; Hasegawa A.; Yagi T.; Hirose K.; Kawaguchi S.I.; Ohishi Y.
发表日期	2020
ISSN	0012821X
卷号	547
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202814
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
推荐引用方式 GB/T 7714	Okuda Y.,Ohta K.,Hasegawa A.,et al. Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle[J],2020,547.
APA	Okuda Y..,Ohta K..,Hasegawa A..,Yagi T..,Hirose K..,...&Ohishi Y..(2020).Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle.Earth and Planetary Science Letters,547.
MLA	Okuda Y.,et al."Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle".Earth and Planetary Science Letters 547(2020).