A Present State and Perspective on Numerical Simulation Studies of Stagnant Slabs

  • YOSHIOKA Shoichi
    Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University

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  • 滞留スラブの数値シミュレーション研究の現状と今後の展望
  • タイリュウ スラブ ノ スウチ シミュレーション ケンキュウ ノ ゲンジョウ ト コンゴ ノ テンボウ

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Abstract

Stagnant slabs have been identified at a depth of about 660 km from recent seismic tomography. In this study I briefly review 2-D numerical simulations of mantle convection, which have been constructed to reveal physical mechanisms of slab stagnation. The effects of the Clapeyron slope of the phase transformation from ringwoodite to perovskite + magnesiowüstite, trench retreat velocity, viscosity jump at the 660-km phase boundary, buoyancy due to a possible metastable olivine wedge inside a slab, and low viscosity due to grain-size reduction associated with the non-equilibrium phase transformation of olivine inside a slab on slab stagnation are presented. Then, I raise some remaining problems on slab dynamics in the mantle transition zone, and show directions toward future research.

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