分離板塊邊緣divergent boundary)又稱建設性板塊邊界,是地殼由於張力作用向兩側擴張延伸,地幔上部經熔融作用冒出產生新的岩石圈

這個地區成為大陸的末端,最終形成大洋盆地大陸板塊移離成為裂谷,而海洋板塊移離則成為中洋脊。熔岩在板塊間流出冷卻,形成盾狀火山火山島

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