气候变化领域集成服务门户(CCPortal): Topographic Fingerprint of Deep Mantle Subduction

CCPortal

DOI	10.1029/2019JB017962
	Topographic Fingerprint of Deep Mantle Subduction
	Briaud A.; Agrusta R.; Faccenna C.; Funiciello F.; van Hunen J.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	The dynamic topography links with the mantle structures at various temporal and spatial scales. However, it is still unclear how it relates to the dynamics of subducting lithosphere when plates reach the mantle transition zone and lower mantle. Seismic tomography images show how slab morphologies vary from sinking subvertically into the lower mantle, to lying flat above the upper-lower mantle discontinuity, to thickening in the shallow lower mantle. These slab shapes have been considered to be the result of variable interaction of the slab with the upper-lower mantle discontinuity at ~670 km depth. Previous studies show that periodic deep slab dynamics can explain a variety of enigmatic geological and geophysical observations such as periodic variations of the plate velocities, trench retreat and advance episodes, and the scattered distribution of slab dip angle in the upper mantle. In this study, we use two-dimensional subduction models to investigate the surface topography expression and its evolution during slab transition zone interaction. Our models show that topography does not depend on slab morphology; indeed, the dynamic topography cannot distinguish between a slab sinking straight into the lower mantle and slab stagnation at the upper-lower mantle boundary. However, topographic oscillations are related to episodes of the trench advance and retreat, which in turn are linked to the slab folding behavior at transition zone depths. Our results suggest that the surface transient signal observed by geological studies could help to detect deep subduction dynamics. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	dynamic topography; folded slab; mantle transition zone
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/188037
作者单位	Laboratory of Experimental Tectonics, Department of Sciences, Roma Tre University, Rome, Italy; Department of Earth Sciences, Durham University, Durham, United Kingdom; Laboratoire de Géologie de Lyon, Université de Lyon, École Normale Supérieure de Lyon, Lyon, France; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States; Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Briaud A.,Agrusta R.,Faccenna C.,et al. Topographic Fingerprint of Deep Mantle Subduction[J],2020,125(1).
APA	Briaud A.,Agrusta R.,Faccenna C.,Funiciello F.,&van Hunen J..(2020).Topographic Fingerprint of Deep Mantle Subduction.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Briaud A.,et al."Topographic Fingerprint of Deep Mantle Subduction".Journal of Geophysical Research: Solid Earth 125.1(2020).