气候变化领域集成服务门户(CCPortal): Stagnant Slabs and Their Return Flows From Finite-Frequency Tomography of the 410-km and 660-km Discontinuities

CCPortal

DOI	10.1029/2020JB021099
	Stagnant Slabs and Their Return Flows From Finite-Frequency Tomography of the 410-km and 660-km Discontinuities
	Guo Z.; Zhou Y.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Slab pull is generally considered as the dominant force that drives the global movement of tectonic plates. This convection mode is well constrained in the upper mantle but the convection pattern in the mid mantle is more speculative. In this study, we present high-resolution global models of the 410-km and 660-km discontinuity structure from finite-frequency tomography of SS precursors. The new models reveal a strong positive correlation between the two discontinuities under major subduction zones. In regions where large-scale stagnant slabs have been reported in the mantle transition zone (MTZ), both discontinuities occur at depths greater than the global average. This structure correlates well with seismic wavespeed anomalies, suggesting possible return flows from the lower mantle warming up the shallow MTZ above the stagnant slabs. Using a simple model for stagnant slabs in geodynamical simulations, we show that this mode of mass exchange between the upper mantle and the lower mantle occurs predominantly in the vicinity of the slabs, and, the return flows become stronger as the extent of slab stagnation increases. © 2021. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187120
作者单位	Department of Geosciences, Virginia Tech, Blacksburg, VA, United States; School of Science, Jiangnan University, Wuxi, Jiangsu, China
推荐引用方式 GB/T 7714	Guo Z.,Zhou Y.. Stagnant Slabs and Their Return Flows From Finite-Frequency Tomography of the 410-km and 660-km Discontinuities[J],2021,126(5).
APA	Guo Z.,&Zhou Y..(2021).Stagnant Slabs and Their Return Flows From Finite-Frequency Tomography of the 410-km and 660-km Discontinuities.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Guo Z.,et al."Stagnant Slabs and Their Return Flows From Finite-Frequency Tomography of the 410-km and 660-km Discontinuities".Journal of Geophysical Research: Solid Earth 126.5(2021).