Abstract
Global seismic tomography of the subduction zones shows that the subducting slabs could either stagnate around the 660-km discontinuity, or penetrate into the lower mantle. The stagnating slabs also have various morphologies. These are directly related to the interaction between the subducting slabs and the mantle transition zone (MTZ), the dynamics of which are still debated. Using a 2-D thermo-mechanical model, we systematically investigated the modes of subduction in the mantle transition zone and explored the key constraints of various subduction styles. Four basic subduction modes are obtained in the numerical experiments, including one with slab penetrating through the 660-km discontinuity and three other modes with slab stagnating in the MTZ (i.e. folding, lying and rolling-back). The numerical models indicate that the age of subducting oceanic plate, the thickness of overriding continental lithosphere and the convergence velocity play crucial roles in the dynamics of subducting slab and MTZ interaction. In general, the young subducting slab favors the penetration or folding mode, whereas the old subducting slab tends to result in lying or rolling-back mode, although other parameters can also affect. Our models also show a strong correlation between the subduction mode selection and dip angle of the slab tip when reaching the 660-km phase boundary.
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Acknowledgements
This work was funded by the project of National Natural Science Foundation of China (Grant nos. 41474086, 41622404, 41590865), and the CAS/CAFEA international partnership program for creative research teams (KZZD-EW-TZ-19). Constructive reviews by Dr. Magali Billen and an anonymous reviewer are greatly appreciated.
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Shi, Y., Wei, D., Li, ZH. et al. Subduction Mode Selection During Slab and Mantle Transition Zone Interaction: Numerical Modeling. Pure Appl. Geophys. 175, 529–548 (2018). https://doi.org/10.1007/s00024-017-1762-0
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DOI: https://doi.org/10.1007/s00024-017-1762-0