globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116820
论文题名:
The grain growth kinetics of bridgmanite at the topmost lower mantle
作者: Fei H.; Faul U.; Katsura T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 561
语种: 英语
中文关键词: bridgmanite ; grain growth ; lower mantle
英文关键词: Grain size and shape ; Growth kinetics ; Activation enthalpies ; Creep strengths ; Ferropericlase ; Increasing temperatures ; Lower mantle condition ; Mantle dynamics ; Multi anvils ; Small grain size ; Grain growth ; enthalpy ; experiment ; grain size ; lower mantle ; magnesiowustite ; perovskite ; slab
英文摘要: The grain size of minerals is an important parameter that controls mantle dynamics. We investigated the grain growth kinetics of bridgmanite that coexists with ferropericlase by multi-anvil experiments at 27 GPa, 1400-2400 K, corresponding to the topmost lower mantle conditions. The experimental results indicate that the grain size of bridgmanite systematically increases with increasing duration, with a grain size exponent of 5.2±0.3. The grain growth rate increases with increasing temperature with an activation enthalpy of 260±20 kJ/mol. The grain size of bridgmanite is ∼30-45 μm in young subducted slabs at the topmost lower mantle conditions. The small grain size in subducted slabs may significantly reduce their creep strength in relatively to ambient mantle, and may cause the slab stagnation at the topmost lower mantle. © 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/165464
Appears in Collections:气候变化与战略

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作者单位: Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, D95447, Germany; Earth Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Center for High Pressure Science and Technology Advanced Research, Beijing, 100097, China

Recommended Citation:
Fei H.,Faul U.,Katsura T.. The grain growth kinetics of bridgmanite at the topmost lower mantle[J]. Earth and Planetary Science Letters,2021-01-01,561
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