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Yan Zhiyong Chen Lin Xiong Xiong Wang Kai Xie Renxian Hsu Hou Tze 《中国科学:地球科学(英文版)》2020,63(8):1069-1091
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 plate is particularly strong.For 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. 相似文献
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区内氧化锰矿皆赋存于含锰层系中,呈似层状或透镜状产出,且与围岩略具同步褶曲,表明锰矿系-古风化型锰矿经后期的进一步氧化、富集所形成的.这一认识对指导区域找矿取得了较好的效果. 相似文献
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