Oblique subduction and mantle flow control on upper plate deformation: 3D geodynamic modeling

نویسندگان

چکیده

Most subduction zones on Earth are oblique, i.e., the angle between plate convergence vector and trench notably differs from 90°. Therefore, modeling understanding strain partitioning in forearc, development of extensional basins back-arc region diachronous transition to collision require a 3D approach. Here, we assess how oblique oceanic subsequent associated mantle flow around subducted lithosphere control thermo-mechanical evolution active margins. We conducted series models discuss influence different obliquity angles, role variations their connection with sediment transport deformation. Numerical complemented by scaled analogue visualize evolution. Oceanic along an results asymmetric return leading gradual decrease driven rotation lower along-trench variation slab retreat. This creates laterally variable velocities geometries. Back-arc extension is governed both toroidal edges induced lateral gradient. The continental facilitates advance retreat Tectonically interface decreases its strength viscosity can alter velocities. Our model provide critical insights into collisional systems, such as Arabia-Eurasia zone.

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ژورنال

عنوان ژورنال: Earth and Planetary Science Letters

سال: 2021

ISSN: ['1385-013X', '0012-821X']

DOI: https://doi.org/10.1016/j.epsl.2021.117056