大洋地壳主要由基性、超基性岩构成，位于大洋盆地下的地壳，简称洋壳。它的特点是地壳较薄而致密，缺失陆壳所特有的“花岗岩层”。洋壳较陆壳年轻，一般不超过2亿年，而大部分陆壳至少为10亿年。
本文论及了ODP与大洋地壳研究的关系。
Inthis article, the relationship of ODP with the research of oceanic crust is discussed.
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.
2011年，科学家们将登上日本一艘名为“地球号”的深海钻井船，他们希望通过钻开一块薄的大洋地壳到达地幔。
By 2011 scientists aboard a Japanese deep-sea drilling ship called Chikyu hope to start drilling through a thin piece of oceanic crust to reach Earth's mantle.
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