Mantle wedge deformation by subducting and rotating slab and its possible implication

作者：Honda S^*; Orihashi Y; Mibe K; Motoki A; Sumino H; Haller M J

来源：Earth Planets and Space, 2006, 58(8): 1087-1092.

• mantle wedge
• rotating slab
• volcanism
• Somuncura
• transition zone
• water

We have constructed a simple model of the deformation of the mantle wedge caused by the subducting and rotating slab based on corner flow model. By applying this model to the geological settings of the Somuncura plateau volcanic region, northern Patagonia, which is located far from the volcanic front, we constrain the mechanical aspect of the hypothesis that the volcanisms of the Somuncura region are triggered by the dehydration-induced melting of the up-warped transition zone which may contain more water than other regions do. Assuming that the water concentrates in the transition zone under the Somuncura plateau, we find that the above scenario may be possible, if the speed of the subducting slab is less than similar to 2 cm/yr or the dip angle changes significantly (similar to 50 degrees within similar to 8 Myr).

• 出版日期2006