气候变化领域集成服务门户(CCPortal): Thermal conductivity near the bottom of the Earth's lower mantle: Measurements of pyrolite up to 120 GPa and 2500 K

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DOI	10.1016/j.epsl.2020.116161
	Thermal conductivity near the bottom of the Earth's lower mantle: Measurements of pyrolite up to 120 GPa and 2500 K
	Geballe Z.M.; Sime N.; Badro J.; van Keken P.E.; Goncharov A.F.
发表日期	2020
ISSN	0012821X
卷号	536
英文摘要	Knowledge of thermal conductivity of mantle minerals is crucial for understanding heat transport from the Earth's core to mantle. At the pressure-temperature conditions of the Earth's core-mantle boundary, calculations of lattice thermal conductivity based on atomistic models have determined values ranging from 1 to 14 W/m/K for bridgmanite and bridgmanite-rich mineral assemblages. Previous studies have been performed at room temperature up to the pressures of the core-mantle boundary, but correcting these to geotherm temperatures may introduce large errors. Here we present the first measurements of lattice thermal conductivity of mantle minerals up to pressures and temperatures near the base of the mantle, 120 GPa and 2500 K. We use a combination of continuous and pulsed laser heating in a diamond anvil cell to measure the lattice thermal conductivity of pyrolite, the assemblage of minerals expected to make up the lower mantle. We find a value of 3.9+1.4−1.1 W/m/K at 80 GPa and 2000 to 2500 K and 5.9+4.0−2.3 W/m/K at 124 GPa and 2000 to 3000 K. These values rule out the highest calculations of thermal conductivity of the Earth's mid-lower mantle (i.e. k<6 W/m/K at 80 GPa), and are consistent with both the high and low calculations of thermal conductivity near the base of the lower mantle. © 2020 Elsevier B.V.
关键词	diamond anvil cell Earth's heat loss finite element methods
英文关键词	Crystal lattices; Finite element method; Minerals; Atomistic models; Core-mantle boundary; Diamond-anvil cell; Earth's lower mantle; Lattice thermal conductivity; Mantle minerals; Mineral assemblage; Pressure-temperature conditions; 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/202604
作者单位	Geophysical Laboratory, Carnegie Institution for Science, Washington, DC, United States; Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, DC, United States; Institut de Physique du Globe de Paris, Université de Paris, Paris, 75005, France
推荐引用方式 GB/T 7714	Geballe Z.M.,Sime N.,Badro J.,et al. Thermal conductivity near the bottom of the Earth's lower mantle: Measurements of pyrolite up to 120 GPa and 2500 K[J],2020,536.
APA	Geballe Z.M.,Sime N.,Badro J.,van Keken P.E.,&Goncharov A.F..(2020).Thermal conductivity near the bottom of the Earth's lower mantle: Measurements of pyrolite up to 120 GPa and 2500 K.Earth and Planetary Science Letters,536.
MLA	Geballe Z.M.,et al."Thermal conductivity near the bottom of the Earth's lower mantle: Measurements of pyrolite up to 120 GPa and 2500 K".Earth and Planetary Science Letters 536(2020).