大洋地壳

大洋地壳的跷跷板现象

Seesaw Phenomenon in Oceanic Crust

有限单元模型的边界条件为太平洋板块相对北美大陆板块的俯冲及与板块俯冲作用有关的大洋地壳的逆冲作用。

Fault development is predicted according to Mohr-Coulomb criterion . The subduction of the Pacific plate beneath the North American plate and associated underplating of oceanic crust marks the boundary condition of finite element model .

大洋地壳和大陆地壳的元素丰度

Abundance of chemical elements in Oceanic and continental crust

同时计算了广西花山复式花岗岩的端元模式年龄，结果显示该岩体的物质来源于2500Ma华南古陆壳和622Ma从亏损地幔分异出来的大洋地壳的混合物。

The results show that the materials of the granite body were derived from a mixing source at the Huanan basement formed at about 2500 Ma ago and an oceanic crust differentiated from DM with an age of about 622 Ma .

根据野外调查、室内化学分析等综合研究，本文认为赣东北含放射虫硅质岩是大陆边缘浅水相沉积产物，稀土元素特征不支持大洋地壳上的深水环境。

According to synthetic researches on the lithology , geochemistry and so on , the authors suggest that the radiolarian cherts belong to continental-margin shallow-water sediments , and the REE patterns of the cherts do not support the viewpoint of deep-water environment above oceanic crust .

冲绳海槽则位于大陆地壳和大洋地壳的过渡地带，它仍然具有大陆地壳的结构特征，并无洋壳的形成，但在海槽的轴部地壳已经减薄。

The Okinawa Trough zone is located in the transitional belt between the continental crust and the oceanic crust . It still has the structure characters of the continental crust , and no any formation of the oceanic crust , but its crust of the central trough has thined .

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 .

琉球岛弧-海沟区的地壳结构总的来说属于过渡型地壳，但在海沟靠洋一侧已属于大洋型地壳，而从琉球海沟往东的西北菲律宾海盆，就完全属于典型的大洋地壳。

The Ryukyu arc-trench zone is belonging to the transition type crust as a whole , but the side of the trench is already belonging to the oceanic crust . And the northwest Philippines Basin to the east of the Ryukyu trench absolutely belongs to the typical 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 .

大洋钻探与大洋地壳研究

Ocean drilling program and study of oceanic crust