解释海洋地壳生成机制为一种假说,也是构成板块构造理论的基本思想之一。它认为海洋地壳上有一个分裂带(表现为洋中脊或洋隆),是海洋地壳的产生地。地幔物质由此不断涌出,冷却后成为新的大洋地壳,原来的海底则随着新的海底地壳的产生而向两侧扩张。
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因此,它们可以重现海底扩张的过程,以及大陆和大洋盆地过去的地理位置发展过程。
They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past.
地貌形成与演化主要受南海新生代两次海底扩张控制。
The two seafloor spreadings of the South China Sea controlled the origin and evolvement of geomorphic types of the study area.
印度洋脊是中大洋脊的一部分,中大洋脊是地壳分离的地球板块形成的。这一形成过程被称为海底扩张。
This is part of the system of mid-ocean ridges that form as the tectonic plates of the Earth's crust move apart-a process known as sea floor spreading.
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