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抬升至地表的海洋地殼 来自维基百科,自由的百科全书
蛇綠岩套是一種具特定垂直的岩石序列,反映了海洋地殼的構造。所以一般人所觀察到的這種岩套都經歷過破壞性板塊運動,如仰沖,才能抬升至海平面上。
如上圖所示,岩套的頂層是0.3公里厚的深海沉積物如燧石,然後是0.3-0.7公里的噴出性枕狀玄武岩、1-1.5公里無間斷的片狀岩脈、2-5公里的入侵性輝長岩,最底層是代表地幔的橄欖岩。[1]
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