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DOI | 10.1038/s41561-018-0225-2 |
Slab stagnation due to a reduced viscosity layer beneath the mantle transition zone | |
Mao, Wei; Zhong, Shijie | |
2018-11-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:11页码:876-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The linear structures of seismically fast anomalies, often interpreted as subducted slabs, in the southern Asia and circum-Pacific lower mantle provided strong evidence for the whole mantle convection model. However, recent seismic studies have consistently shown that subducted slabs are deflected horizontally for large distances in mantle transition zone in the western Pacific and other subduction zones, suggesting that the slabs meet significant resistance to their descending motion and become stagnant in the transition zone. This poses challenges to the whole mantle convection model and also brings the origin of stagnant slabs into question. Here, using a global mantle convection model with realistic spine-post-spinel phase change (-2 MPa K-1 Clapeyron slope) and plate motion history, we demonstrate that the observed stagnant slabs in the transition zone and other slab structures in the lower mantle can be explained by the presence of a thin, weak layer at the phase change boundary that was suggested by mineral physics and geoid modelling studies. Our study also shows that the stagnant slabs mostly result from subduction in the past 20-30 million years, confirming the transient nature of slab stagnation and phase change dynamics on timescales of tens of millions of years from previous studies. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448672100016 |
WOS关键词 | TEMPERATURE-DEPENDENT VISCOSITY ; PLATE-MOTION HISTORY ; SUBDUCTED SLABS ; KM DISCONTINUITY ; CONVECTION ; MODELS ; PENETRATION ; TRENCH ; HETEROGENEITY ; TECTONICS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35171 |
专题 | 地球科学 气候变化 |
作者单位 | Univ Colorado, Dept Phys, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Mao, Wei,Zhong, Shijie. Slab stagnation due to a reduced viscosity layer beneath the mantle transition zone[J]. NATURE GEOSCIENCE,2018,11(11):876-+. |
APA | Mao, Wei,&Zhong, Shijie.(2018).Slab stagnation due to a reduced viscosity layer beneath the mantle transition zone.NATURE GEOSCIENCE,11(11),876-+. |
MLA | Mao, Wei,et al."Slab stagnation due to a reduced viscosity layer beneath the mantle transition zone".NATURE GEOSCIENCE 11.11(2018):876-+. |
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