| DOI: | 10.1002/2014GL062159
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| 论文题名: | The effect of metastable pyroxene on the slab dynamics |
| 作者: | Agrusta R.; Van Hunen J.; Goes S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9452
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| EISSN: | 1944-9183
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| 出版年: | 2014
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| 卷: | 41, 期:24 | | 起始页码: | 8800
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| 结束页码: | 8808
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| 语种: | 英语
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| 英文关键词: | metastable pyroxene
; phase transition
; subduction
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| Scopus关键词: | Buoyancy
; Olivine
; Phase transitions
; Tectonics
; Mantle transition zone
; Metastable olivine
; metastable pyroxene
; Oceanic lithosphere
; Subducting slabs
; subduction
; Subduction model
; Transition zones
; Silicate minerals
; buoyancy
; diffusion
; lithosphere
; mantle
; olivine
; plate boundary
; pyroxene
; seismic data
; simulation
; slab
; subduction
; transition zone
; viscosity
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| 英文摘要: | Seismic studies show that some subducting slabs penetrate straight into the lower mantle, whereas others seem to flatten near the base of the mantle transition zone. Slab stagnation is often attributed to an increase in viscosity and phase transformations in the olivine system. However, recent mineral physics studies showed that due to extremely low transformational diffusion rates, low-density metastable pyroxene may persist into the transition zone in cool slabs. Here we use a dynamically fully self-consistent subduction model to investigate the influence of metastable pyroxene on the dynamics of subducting oceanic lithosphere. Our results show that metastable pyroxene affects slab buoyancy at least as much as olivine metastability. However, unlike metastable olivine, which can inhibit slab penetration in the lower mantle only for cold, old, and fast slabs, metastable pyroxene is likely to also affect sinking of relatively young and slow slabs. Key Points Numerical simulation of interaction descending slab and mantle transition zoneSlab buoyancy from metastable pyroxene larger than from metastable olivineMetastable pyroxene encourages slab stagnation, including for young plates ©2015. The authors. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921775293&doi=10.1002%2f2014GL062159&partnerID=40&md5=33aeddefcc29925fdf5ac9d1366e4e42
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6716
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth Sciences, Durham University, Durham, United Kingdom
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| Recommended Citation: | |
Agrusta R.,Van Hunen J.,Goes S.. The effect of metastable pyroxene on the slab dynamics[J]. Geophysical Research Letters,2014-01-01,41(24).
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