气候变化领域集成服务门户(CCPortal): Deformation across the mantle transition zone: A theoretical mineral physics view

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DOI	10.1016/j.epsl.2020.116438
	Deformation across the mantle transition zone: A theoretical mineral physics view
	Ritterbex S.; Carrez P.; Cordier P.
发表日期	2020
ISSN	0012821X
卷号	547
英文摘要	The dynamics of the Earth's mantle is still poorly constrained due to the lack of understanding the transfer of matter between the upper and the lower mantle and their convective vigor. The transition zone (TZ) might play a crucial role as the interface connecting the upper to the lower mantle. Here, we examine the rheology of the main TZ minerals, wadsleyite, ringwoodite and majorite garnet based on a mineral physics approach. Using the results of lattice friction modeling and dislocation glide mobilities together with the available data on self-diffusion in the TZ minerals, we quantify their plastic deformation by diffusion and dislocation creep from theoretical plasticity models. We show that pure climb creep is expected to contribute to the plasticity of the TZ without the need of significant diffusion-related hydrolytic weakening, matching well the geophysical observations. Our model results predict that crystallographic preferred orientations (CPO) might only develop along with stress concentrations as present around cold subducting slabs which can be locally weaker than the surrounding TZ despite their lower temperatures. © 2020 The Author(s)
关键词	deformation modeling majorite pure climb creep ringwoodite transition zone wadsleyite
英文关键词	Creep; Diffusion; Plastic deformation; Plasticity; Cold subducting slabs; Crystallographic preferred orientations; Dislocation creep; Dislocation glide; Geophysical observations; Hydrolytic weakening; Lower temperatures; Mantle transition zone; Minerals; crystallography; lattice dynamics; majorite; mantle structure; plastic deformation; preferred orientation; rheology; ringwoodite; theoretical study; transition zone; wadsleyite
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/202861
作者单位	Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207, UMET - Unité Matériaux et Transformations, Lille, F-59000, France; Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama, 790-8577, Japan; Institut Universitaire de France, 1 rue Descartes, Paris, 75005, France
推荐引用方式 GB/T 7714	Ritterbex S.,Carrez P.,Cordier P.. Deformation across the mantle transition zone: A theoretical mineral physics view[J],2020,547.
APA	Ritterbex S.,Carrez P.,&Cordier P..(2020).Deformation across the mantle transition zone: A theoretical mineral physics view.Earth and Planetary Science Letters,547.
MLA	Ritterbex S.,et al."Deformation across the mantle transition zone: A theoretical mineral physics view".Earth and Planetary Science Letters 547(2020).