globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116871
论文题名:
Contrasting opacity of bridgmanite and ferropericlase in the lowermost mantle: Implications to radiative and electrical conductivity
作者: Lobanov S.S.; Soubiran F.; Holtgrewe N.; Badro J.; Lin J.-F.; Goncharov A.F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 562
语种: 英语
中文关键词: bridgmanite ; core-mantle boundary ; ferropericlase ; high pressure ; thermal conductivity ; time-resolved spectroscopy
英文关键词: Electric conductivity ; Light absorption ; Opacity ; Thermal conductivity ; Bridgmanite ; Core-mantle boundary ; Electrical conductivity ; Ferropericlase ; Geological phenomenon ; High pressure ; Lowermost mantle ; Radiative conductivity ; Thermal ; Time-resolved spectroscopy ; Geomagnetism ; core-mantle boundary ; crystalline rock ; electrical conductivity ; geomagnetic field ; lower mantle ; P-T conditions ; periclase ; spectroscopy ; thermal conductivity
英文摘要: Earth's lowermost mantle displays complex geological phenomena that likely result from its heterogeneous physical interaction with the core. Geophysical models of core-mantle interaction rely on the thermal and electrical conductivities of appropriate geomaterials which, however, have never been probed at representative pressure and temperature (P-T) conditions. Here we report on the opacity of single crystalline bridgmanite and ferropericlase and link it to their radiative and electrical conductivities. Our results show that light absorption in the visible spectral range is enhanced upon heating in both minerals but the rate of change in opacity with temperature is a factor of six higher in ferropericlase. As a result, bridgmanite in the lowermost mantle is moderately transparent while ferropericlase is highly opaque. Our measurements support previous indirect estimates of low (< 1 W/m/K) and largely temperature-independent radiative conductivity in the lowermost mantle. This implies that the radiative mechanism has not contributed significantly to cooling the Earth's core throughout the geologic time. Opaque ferropericlase is electrically conducting and mediates strong core-mantle electromagnetic coupling, explaining the intradecadal oscillations in the length of day, low secular geomagnetic variations in Central Pacific, and the preferred paths of geomagnetic pole reversals. © 2021 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/165575
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作者单位: GFZ German Research Center for Geosciences, Section 3.6, Telegrafenberg, Potsdam, 14473, Germany; Earth and Planets Laboratory, Carnegie Institution of Washington, Washington, DC, 20015, United States; École Normale Supérieure de Lyon, Université Lyon 1, Laboratoire de Géologie de Lyon, CNRS UMR5276, Lyon Cedex 07, 69364, France; Université de Paris, Institut de physique du globe de Paris, CNRS, Paris, 75005, France; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, United States

Recommended Citation:
Lobanov S.S.,Soubiran F.,Holtgrewe N.,et al. Contrasting opacity of bridgmanite and ferropericlase in the lowermost mantle: Implications to radiative and electrical conductivity[J]. Earth and Planetary Science Letters,2021-01-01,562
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