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DOI | 10.1029/2021GL093679 |
Formation of horizontally deflected slabs in the mantle transition zone caused by spinel-to-post-spinel phase transition, its associated grainsize reduction effects, and trench retreat | |
Wei Mao; Shijie Zhong | |
2021-07-15 | |
发表期刊 | Geophysical Research Letters
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出版年 | 2021 |
英文摘要 | Seismic observations indicate accumulation of subducted slabs in the mantle transition zone in many subduction zones. By systematically conducting 2-D numerical experiments, we demonstrate that a weak layer or zone beneath the spinel-to-post-spinel phase transition leads to horizontally deflected (stagnant) slab structures in the mantle transition zone, which is consistent with recent studies of 3-D global mantle convection models. Trench retreat velocity, Clapeyron slope and the viscosity contrast between the lower mantle and mantle transition zone also affect horizontally deflected slab formation. By considering grain size dependent viscosity and grainsize evolution for slabs going through the phase change in the lower mantle, our models with a dynamically generated weak zone beneath the phase boundary indicate that the geometry and viscosity reduction of the weak zone is strongly affected by grain growth rate. A smaller grain growth rate results in a thicker and wider weak zone that promotes deflected slab formation. |
领域 | 气候变化 |
URL | 查看原文 |
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文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/333980 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Wei Mao,Shijie Zhong. Formation of horizontally deflected slabs in the mantle transition zone caused by spinel-to-post-spinel phase transition, its associated grainsize reduction effects, and trench retreat[J]. Geophysical Research Letters,2021. |
APA | Wei Mao,&Shijie Zhong.(2021).Formation of horizontally deflected slabs in the mantle transition zone caused by spinel-to-post-spinel phase transition, its associated grainsize reduction effects, and trench retreat.Geophysical Research Letters. |
MLA | Wei Mao,et al."Formation of horizontally deflected slabs in the mantle transition zone caused by spinel-to-post-spinel phase transition, its associated grainsize reduction effects, and trench retreat".Geophysical Research Letters (2021). |
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