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Article Dans Une Revue Tectonophysics Année : 2013

Effect of aseismic ridge subduction on slab geometry and overriding plate deformation: Insights from analogue modeling

Résumé

We present analogue models simulating the subduction of a buoyant ridge beneath an advancing overriding plate whose velocity is imposed by lateral boundary conditions. We analyze the 3D geometry of the slab, the deformation and topography of the overriding plate. Ridge subduction diminishes the dip of the slab, eventually leading to the appearance of a horizontal slab segment. This result contrasts with that obtained in free subduction experiments, in which ridge subduction diminishes the convergence velocity which, in turn, increases the dip of the slab beneath the ridge. The slab dip decrease is accompanied by the indentation of the overriding plate by the ridge, resulting in arc curvature. Indentation is larger for small convergence velocity and large slab dip. Ridge subduction also uplifts the overriding plate. Uplift first occurs close to the trench (~fore-arc area) and is accompanied by the flexural subsidence of the overriding plate behind the uplifted area (~back-arc subsidence). The uplifted area migrates within the overriding plate interiors following the appearance of a horizontal slab segment. These results are compared with natural examples of ridge subduction in the circum-Pacific area. They explain why ridge subduction may have contrasted effects on the overriding plate dynamics depending on the global conditions that constrain the converging system.
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Dates et versions

hal-00801440 , version 1 (16-03-2013)

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Joseph Martinod, Benjamin Guillaume, Nicolas Espurt, Claudio Faccenna, Francesca Funiciello, et al.. Effect of aseismic ridge subduction on slab geometry and overriding plate deformation: Insights from analogue modeling. Tectonophysics, 2013, 588, pp.39-55. ⟨10.1016/j.tecto.2012.12.010⟩. ⟨hal-00801440⟩
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