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海相火山岩是在较高围压(海水静压力)和海水淬火的条件下冷凝生成的,因而往往具有一些与陆相火山岩不同的结构。由海底火山熔浆冷凝时的压力条件来看,它具有次火山相中的近地表亚相、或超浅成亚相,甚至浅成亚相冷凝时的压力条件。据现代大洋资料,海洋的水深虽各处不同,但占海洋面积较大的部分的水深是4,000—5,000米,如太平洋的水深平均是4,028米。经计算5,000米深的海水产生
Marine volcanic rocks are condensed at higher confining pressures (seawater hydrostatic pressure) and seawater quenching conditions and thus often have some structure different from continental volcanic rocks. From the pressure conditions at the time when the seafloor volcano is condensed, it has the sub-volcanic facies sub-facies near the surface, or ultra-shallow into the sub-phase, and even into shallow sub-phase condensate pressure conditions. According to modern oceanographic data, the depth of the ocean varies from place to place. However, the depth of the ocean is 4,000 to 5,000 meters, while the average depth of the Pacific Ocean is 4,028 meters. After calculating 5,000 meters deep seawater generated