Journal
GEOLOGY
Volume 37, Issue 8, Pages 747-750Publisher
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G30052A.1
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- Agence National de la Recherche (ANR)
- Institut National des Sciences de l'Univers-Centre National de la Recherche Scientifique (INSU/CNRS)
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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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