The sinking of oceanic crust at subduction zones carries water and carbon dioxide back into the mantle. 在俯冲区洋壳下沉,又把水和二氧化碳带回地下。
The Ophiolite massifs are composed of mantle peridotite that is mainly harzburgite and dunite, and lacked of crust magmatite within the typical Ophiolite suite. 摘要该蛇绿岩带的岩体由地幔橄榄岩组成,主要岩石类型是方辉橄榄岩和纯橄榄岩,缺少典型蛇绿岩剖面中的洋壳单元。