洋中脊洋壳的形成与上地幔通过绝热熔化和多孔熔岩流的连续过程形成熔融物是分不开的。熔岩一旦到达洋壳,就会被不连续的事件所控制;来自于中层洋壳熔岩体的岩墙侵入构成了上地壳的席状岩墙,同时,近地壳的熔岩构建了下地壳的层状辉长岩(Kelemen等,1997)。由地幔运移和抽取而来 The formation of mid-oceanic ridge oceanic crust is inseparable from the formation of the melt by the advent of the upper mantle through a continuous process of adiabatic melting and porous lava flow. Once the lava reaches the oceanic crust, it is controlled by discontinuous events; intrusion of the dyke wall from the middle oceanic lava body forms the upper dike-like dyke wall, while lava in the near-crustal shell forms the lower crust Gabbro (Kelemen et al., 1997). Migration and extraction from the mantle