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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle
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Thermal conductivity of Fe-bearing post-perovskite in the Earth's lowermost mantle

机译：Fe-轴承后钙钛矿的热导率在地球的最低地幔中

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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. (C) 2020 Elsevier B.V. All rights reserved.
机译：后钙钛矿（PPV）的导热率（PPV）是地球地幔中MGSIO3的最高压力多晶型物，是用于在核心 - 地幔边界的温度曲线和动态上提供更好限制的最重要的传输性能之一（CMB） 。将Fe纳入PPV可能影响其导电性，从未经过实验研究过。在这里，我们确定PPV的晶格热导率在高PT条件下含有3摩尔％和10mol％的Fe - 高达149gPa和177GPa的压力，以及高达1560 k的温度 - 通过最近开发的脉冲光加热热反射技术结合连续波加热激光器。我们发现将Fe加入PPV时适度地降低了其晶格导热率，因为它增加了Fe含量。 PPV优势吡钛矿的散装电导率估计比下部地幔中的Bridgmanite和铁铁矿高的1.5倍，这与传统观点同意，即PPV在地球最低地幔中的Bridgmanite是更好的热导体。 （c）2020 Elsevier B.v.保留所有权利。

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