大洋型地（cceanic crustl）是地壳的一种类型，位于大洋盆地之下，相当于硅镁层。大洋型地壳缺乏硅铝层，大洋型地壳厚度约5公里，密度为3.0克/立方厘米，池震波的P波传播速度大于每秒6.2公里。
南海地壳属于大洋型地壳与大陆型地壳之间的过度类型。
The earth′s crust of the South China Sea belongs to the transitional type between the oceanic crust and continental crust.
综合分析认为：冲绳海槽地壳属于过度型地壳，与大洋地壳的许多特点颇为相似。
It is considered that the crust in the Okinawa Trough area belongs to the transition type, which is quite similar to the feature of the oceanic crust.
南海是东亚大陆边缘的巨型陆缘海，属大陆—大洋过渡型地壳构造区。
The South China Sea is a huge marginal sea at East-Asian continental margin, and a tectonic region of the transitional crust type from continental to oceanic.
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