NUMERICAL MODELLING OF THE LATE STAGE OF SUBDUCTION ZONE TRANSFERENCE AFTER AN ACCRETION EVENTстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:The resumption of subduction of an oceanic plate at a contact with a docked island (continental) margin is modelled numerically in 2D. The mechanical properties of the crustal and mantle rock masses are treated with visco-plastic rheologies where the viscosities are described by a dynamic power law phenomenologically accounting for the transient texture evolution of the deforming rock masses. The study is limited to the extreme case of a fluid weakened lithosphere characterized by a uniform effective yield stress. At a constant push of 8 cm a^{-1}, the shear zones split the oceanic slab into blocks at the contact with the island. At a moderate yield stress (\sigma_Y < 80 MPa) and normal relaxation rate of viscosity, subduction resumes in less than ca 1 Ma. High \sigma_Y = 100 MPa leads to the island edge bending. A detached block of the island is subducted after the plunge of the oceanic plate reverses.