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From longitudinal slab curvature to slab rheology

Abstract : The curvature of a subducting lithosphere is chiefly controlled by the viscosity ratio between the slab and the surrounding mantle. On the basis of a semi-analytical flow model, we explore the rheological dependence of the geometrical response of a viscous slab subjected to toroidal mantle flow. Mantle flow is excited by slab retreat at a prescribed mean velocity and is iteratively solved for by using a stream function approach, in turn providing the stresses that bend the slab. Comparison between model predictions and geophysical observations of slab curvature gives an average slab-to-mantle viscosity ratio of 45.
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Submitted on : Monday, October 19, 2009 - 10:05:25 AM
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Christelle Loiselet, Laurent Husson, Jean Braun. From longitudinal slab curvature to slab rheology. Geology, Geological Society of America, 2009, 37 (8), pp.747-750. ⟨10.1130/G30052A.1⟩. ⟨insu-00424882⟩



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