气候变化领域集成服务门户(CCPortal): Interplays Between Mantle Flow and Slab Pull at Subduction Zones in 3D

CCPortal

DOI	10.1029/2020JB021574
	Interplays Between Mantle Flow and Slab Pull at Subduction Zones in 3D
	Guillaume B.; Funiciello F.; Faccenna C.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	The understanding of the interactions between subduction-induced mantle flow and background mantle flow (being global or regional) remains incomplete despite its potential impact on subduction dynamics and associated deformation. Here we present the results of three-dimensional laboratory models of subduction zones at the scale of the upper mantle in which we systematically vary the plate's width and trench perpendicular background mantle flow. In particular, we test different mantle flow magnitudes and directions of flow, and evaluate their impact on the slab geometry in the vertical plane, trench shape evolution, and the superficial horizontal mantle deformation. While the chosen viscosity ratio between the convective mantle and the subducting plate in our models (∼100) is favorable to the deformation of the slab through mantle displacement, we show that the geometry of the slab in the vertical plane is only marginally affected by the imposed background flow. Instead, the background flow has a larger impact on the horizontal kinematics and deformation of the trench. It reduces along-trench variations of trench kinematics, which in turn decreases trench curvature, and it largely disturbs the pattern of mantle deformation at slab edges, inhibiting the development of toroidal cells. We also show that the thickness of the convective layer (here, the upper mantle) controls the toroidal component of the mantle flow and the length scale of trench curvature for large subduction zones. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	mantle flow; slab geometry; slab pull; subduction; trench curvature
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/187130
作者单位	University of Rennes, CNRS, Géosciences Rennes, UMR 6118, Rennes, France; Dipartimento di Scienze, Laboratory of Experimental Tectonics, Università “Roma Tre”, Rome, Italy; Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States
推荐引用方式 GB/T 7714	Guillaume B.,Funiciello F.,Faccenna C.. Interplays Between Mantle Flow and Slab Pull at Subduction Zones in 3D[J],2021,126(5).
APA	Guillaume B.,Funiciello F.,&Faccenna C..(2021).Interplays Between Mantle Flow and Slab Pull at Subduction Zones in 3D.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Guillaume B.,et al."Interplays Between Mantle Flow and Slab Pull at Subduction Zones in 3D".Journal of Geophysical Research: Solid Earth 126.5(2021).