globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116438
论文题名:
Deformation across the mantle transition zone: A theoretical mineral physics view
作者: Ritterbex S.; Carrez P.; Cordier P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547
语种: 英语
中文关键词: 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
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)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165239
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Ritterbex S.,Carrez P.,Cordier P.. Deformation across the mantle transition zone: A theoretical mineral physics view[J]. Earth and Planetary Science Letters,2020-01-01,547
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