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。
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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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