有关扩张的模式和速度的资料不足,所以不能建立起板块相对运动的模式。相对于北大西洋和中大西洋的张开而建立的北美板块运动模式(科尼,1972)表明,北美板块离开欧洲向南西向的旋转发生于80～40百万年之前。大洋的法拉龙板块和北美板块间相对运动的模式表明,在80百万年,两个板块 There is not enough information about the mode and speed of expansion, so a model of relative movement of plates can not be established. The pattern of North American plate movement relative to the opening of the North Atlantic and the Mid-Atlantic (Kony et al. 1972) shows that the North-South plate rotation south-west of Europe away from Europe occurred 80 to 40 million years ago. The pattern of relative movement between the ocean’s Fararon and North American plates shows that over 80 million years, two plates