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Observations and modeling of flat subduction and its geological effects

Science China Earth Sciences 2020年第8期63卷 1069-1091页

作者： Zhiyong YAN Lin CHEN Xiong XIONG Kai WANG Renxian XIE Hou Tze HSU MOE Key Laboratory of Fundamental Physical Quantities Measurement&Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074China Institute of Geophysics and PGMF Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Geodesy and Earth s Dynamic Institute of Geodesy and GeophysicsChinese Academy of SciencesWuhan 430077China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institute of Geophysics and Geomatics China University of GeosciencesWuhan 430074China

flat subduction refers to low-angle(<10°) or sub-horizontal subduction of oceanic slabs. flat subduction is only recognized in ~10% of present-day subduction zones, but its impact on the behavior of the overriding pl... 详细信息

flat subduction refers to low-angle(subduction of oceanic slabs. flat subduction is only recognized in ~10% of present-day subduction zones, but its impact on the behavior of the overriding plate is particularly *** example, flat subduction zones are typically associated with stronger earthquakes. The deformation caused by typical flat subduction will transfer from the trench to the overriding continental interior and form a broad magma belt. The formation mechanism of flat subduction has been linked to the relative buoyancy of subducted oceanic plateaus, overthrusting of the overriding plate, hydrodynamic suction, and trench retreat. However, these mechanisms remain debated. This paper systematically analyzes and summarizes previous studies on flat subduction, and outlines the possible geological effects of flat subduction, such as intracontinental orogeny and magmatism. Using examples from numerical modeling, we discuss the possible formation mechanisms. The most important factors that control the formation of flat subduction are associated with overthrusting of the overriding plate and the arrival of an oceanic plateau at the subduction zone. In addition, trench retreat is necessary to enable flat subduction. Hydrodynamic suction contributes to the reduction of the slab dip angle, but is insufficient to form flat subduction. Future numerical modeling of flat subduction should carry out three-dimensional high-resolution thermo-mechanical simulation, considering the influence of crustal eclogitization(negative buoyancy) and mantle serpentinization(positive buoyancy) of oceanic lithosphere, in combination with geological and geophysical data.

关键词： flat subduction Magmatism Intracontinental orogeny Formation mechanism Numerical modeling

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Aseismic ridge subduction and flat subduction:Insights from three-dimensional numerical models

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Earth and Planetary Physics 2023年第2期7卷 269-281页

作者： Hui Zhao Wei Leng Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China

flat subduction can significantly influence the distribution of volcanism,stress state,and surface topography of the overriding ***,the mechanisms for inducing flat subduction remain *** two-dimensional(2-D)numerical models and laboratory analogue models suggested that a buoyant impactor(aseismic ridge,oceanic plateau,or the like)may induce flat ***,three-dimensional(3-D)systematic studies on the relationship between flat subduction and buoyant blocks are still ***,we use a 3-D numerical model to investigate the influence of the aseismic ridge,especially its width(which is difficult to consider in 2-D numerical models),on the formation of flat *** model results suggest that the aseismic ridge needs to be wide and thick enough to induce flat subduction,a condition that is difficult to satisfy on the *** also find that the subduction of an aseismic ridge parallel to the trench or a double aseismic ridge normal to the trench has a similar effect on super-wide aseismic ridge subduction in terms of causing flat subduction,which can explain the flat subduction observed beneath regions such as Chile and Peru.

关键词： flat subduction aseismic ridge oceanic plateau 3-D numerical simulation

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