自Karig(1971)提出西太平洋边缘弧后盆地的扩张成因假说以来,许多学者从不同角度研究了该区的沟—弧—盆系,他们多认为岛弧和弧后盆地主要是由于大洋板块的俯冲,导致弧后地壳的裂离扩张而形成的。但许多调查结果并不支持“弧后扩张”假说。弧后盆地是如何扩张而又停止扩张的?如果弧后扩张的原动力是源于洋中脊的扩张和扩张板块在海沟的 Since Karig (1971) proposed the expansion causality hypothesis of the western Pacific marginal backarc basin, many scholars have studied the ditch-arc-basin system in this area from different angles. They mostly think that the island arc and the backarc basin are mainly caused by the oceanic plate Subduction, resulting in the back of the crust after the expansion of the formation of the crack. However, many of the findings do not support the “post-arc dilation” hypothesis. How the backarc basin expands and stops expanding? If the back-arc dorsal dynamic originates from the expansion and expansion of mid-oceanic ridges in the trenches