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俯冲带是研究地幔对流的重要窗口。二维模型显示,大洋板块俯冲时会因粘滞作用带动上覆地幔,诱发地幔楔流动。而三维空间中,地震波的各向异性、3D数值模拟及实验研究都显示,俯冲带地幔流动情况非常复杂。由于原始弧岩浆能代表地幔楔的组成,因此可以从弧岩浆地球化学性质的空间变化上直接反应地幔楔的流动模式。加拿大英属哥伦比亚大学学者Emily Mullen和Dominique Weis最近重新对Cascade弧北部近平行于弧方向的
Subduction zone is an important window for studying convection of mantle. The two-dimensional model shows that when the oceanic plate subducts, the overlying mantle will be driven by the viscous effect, causing the mantle wedge to flow. In three-dimensional space, the seismic wave anisotropy, 3D numerical simulation and experimental studies have shown that the subduction zone mantle flow is very complicated. Since the original arc magma can represent the composition of the mantle wedge, the mantle wedge flow pattern can be directly reflected from the spatial variation of the geochemical properties of the arc magma. University of British Columbia scholar Emily Mullen and Dominique Weis recently re-aligned the northern Cascade Arc near arc