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DOI	10.1016/j.epsl.2021.116820
	The grain growth kinetics of bridgmanite at the topmost lower mantle
	Fei H.; Faul U.; Katsura T.
发表日期	2021
ISSN	0012821X
卷号	561
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.
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
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/203086
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
推荐引用方式 GB/T 7714	Fei H.,Faul U.,Katsura T.. The grain growth kinetics of bridgmanite at the topmost lower mantle[J],2021,561.
APA	Fei H.,Faul U.,&Katsura T..(2021).The grain growth kinetics of bridgmanite at the topmost lower mantle.Earth and Planetary Science Letters,561.
MLA	Fei H.,et al."The grain growth kinetics of bridgmanite at the topmost lower mantle".Earth and Planetary Science Letters 561(2021).