globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116498
论文题名:
A numerical study of thermal and chemical structures at the core-mantle boundary
作者: Stein C.; Mertens M.; Hansen U.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 548
语种: 英语
中文关键词: convection modelling ; core-mantle boundary ; LLSVP ; topography ; ULVZ
英文关键词: Boundary layers ; Piles ; Structural geology ; Structure (composition) ; Topography ; Complex structure ; Core-mantle boundary ; Large structures ; Lowermost mantle ; Mantle convection ; Structure and dynamics ; Temporal evolution ; Thermochemical models ; Plates (structural components) ; chemical composition ; core-mantle boundary ; mantle convection ; mantle plume ; numerical model ; subduction ; temperature anomaly
英文摘要: The core-mantle boundary (CMB) represents the lower boundary layer of the actively convecting Earth's mantle and is structurally very complex. Thermal and chemical structures such as thermal plumes and thermochemical piles have been considered to explain the complexities. Both affect the dynamics of the Earth's mantle and its temporal evolution. But also the surface plates are an essential aspect of mantle convection that strongly influence the dynamics of the interior. We use numerical thermochemical models of mantle convection to study the structure and dynamics of the lowermost mantle. Our approach allows for the investigation of plumes and piles in combination with plate-like surface motion and deep subduction. The models show that the presence of a dense CMB layer generally reduces the mobility of the surface plates but that during plate evolution a variety of plume classes occur leaving a complex structure at the CMB. The CMB topography shows large elevated areas with sharp edges and a flat or slightly dented top for piles with plumes atop. Also, plume clusters can cause large elevated areas with sharp edges but a flat top with a few smaller peaks. Smaller-scale patterns, often close to the edges of the large structures cause smaller peaks in CMB topography and can be explained by either line-plumes or wind-driven thermals. The latter often arise when heat is trapped beneath subducted slabs that spread over the CMB. © 2020 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165285
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作者单位: Institut f. Geophysik, Westfälische Wilhelms-Universität, Corrensstr. 24, Münster, Germany; Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Institut f. Physik der Atmosphäre, Oberpfaffenhofen, Germany

Recommended Citation:
Stein C.,Mertens M.,Hansen U.. A numerical study of thermal and chemical structures at the core-mantle boundary[J]. Earth and Planetary Science Letters,2020-01-01,548
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