离散边界divergent boundary)又称建设性板块边界,是地壳由于张力作用向两侧扩张延伸,地幔上部经熔融作用冒出产生新的岩石圈

这个地区成为大陆的末端,最终形成大洋盆地大陆板块移离成为裂谷,而海洋板块移离则成为中洋脊。熔岩在板块间流出冷却,形成盾状火山火山岛

例子

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