气候变化领域集成服务门户(CCPortal): Oblique subduction and mantle flow control on upper plate deformation: 3D geodynamic modeling

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DOI	10.1016/j.epsl.2021.117056
	Oblique subduction and mantle flow control on upper plate deformation: 3D geodynamic modeling
	Balázs A.; Faccenna C.; Ueda K.; Funiciello F.; Boutoux A.; Blanc E.J.-P.; Gerya T.
发表日期	2021
ISSN	0012821X
卷号	569
英文摘要	Most subduction zones on Earth are oblique, i.e., the angle between the plate convergence vector and the trench notably differs from 90°. Therefore, modeling and understanding the strain partitioning in the forearc, the development of extensional basins in the back-arc region and the diachronous transition from subduction to collision require a 3D approach. Here, we assess how oblique oceanic subduction and subsequent collision and associated mantle flow around the subducted lithosphere control the thermo-mechanical evolution of active margins. We conducted a series of 3D thermo-mechanical subduction models and discuss the influence of different subduction obliquity angles, the role of mantle flow variations and their connection with sediment transport and back-arc deformation. Numerical models are complemented by scaled analogue models to visualize the mantle flow evolution. Oceanic subduction along an oblique trench results in asymmetric mantle return flow leading to the gradual decrease of the subduction obliquity angle driven by the gradual rotation of the lower plate and the along-trench variation of slab retreat. This creates laterally variable subduction velocities and slab geometries. Back-arc extension is governed by both the toroidal mantle flow along the slab edges and by the oblique subduction induced lateral mantle flow gradient. The diachronous transition from oceanic to continental subduction and collision facilitates the laterally variable trench advance and retreat and back-arc deformation. Tectonically induced lateral sediment transport in the trench and along the subduction interface decreases its strength and viscosity and can alter subduction velocities. Our model results provide critical insights into the evolution of oblique subduction and collisional systems, such as the Arabia-Eurasia convergence zone. © 2021 The Author(s)
关键词	3D numerical modeling Arabia-Eurasia collision back-arc deformation mantle flow oblique subduction
英文关键词	3D modeling; Geodynamics; Numerical models; Sediment transport; Sedimentation; 3D numerical modelling; Arabium-eurasia collision; Back-arc deformation; Geodynamic modeling; Mantle flow; Oblique subduction; Oceanic subduction; Plate deformations; Thermo-mechanical; Upper plate; Deformation; Arabian plate; convergent evolution; deformation mechanism; Eurasian plate; geodynamics; plate motion; plate tectonics; subduction zone; three-dimensional modeling
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203026
作者单位	Università Roma Tre, Department of Sciences, Rome, Italy; ETH Zürich, Department of Earth Sciences, Zürich, Switzerland; University of Texas at Austin, Jackson School of Geosciences, Department of Geological Science, Austin, United States; Equinor, Oslo, Norway
推荐引用方式 GB/T 7714	Balázs A.,Faccenna C.,Ueda K.,et al. Oblique subduction and mantle flow control on upper plate deformation: 3D geodynamic modeling[J],2021,569.
APA	Balázs A..,Faccenna C..,Ueda K..,Funiciello F..,Boutoux A..,...&Gerya T..(2021).Oblique subduction and mantle flow control on upper plate deformation: 3D geodynamic modeling.Earth and Planetary Science Letters,569.
MLA	Balázs A.,et al."Oblique subduction and mantle flow control on upper plate deformation: 3D geodynamic modeling".Earth and Planetary Science Letters 569(2021).