【摘要】 冲绳海槽内有三个基本的地貌单元,即西侧陆坡,槽底盆地和东侧岛坡.冲绳海槽具有东西分带和南北分块的特点.海槽内主要地貌类型包括地堑、断裂沟谷及海底火山等,它们都是构造地貌形态.断裂作用和火山活动在地貌发育中起着重要的作用.目前冲绳海槽正处于孤后扩张的初生阶段,它的发展方向将是地壳大洋化,由此导致今后海槽内地貌的发展方向将是“地貌大洋化”.更多还原

【Abstract】 The Okinawa Trough is a marginal basin between the East China Sea shelf and the Ryukyu arc, with its axis running NE-SW. It is about 1000 km long and 150 km wide on average. Its bottom topography is very complex and there are many geomorphic types. Based on surveying and studying, some conclustions are made:1. The Okinawa Trough is a marginal basin with strong tectonic movement characterized by down-faulting geomorphy, it may be devided into three NE-SW belts and four NW-SE zones. These divisions are closely related to its geological history and that of other marginal basins of the West Pacific Ocean.2. There are three basic geomorphic units in the Okinawa Trough: the shelf slope, bottom basin and the Ryukyu island slope from NW to SE. Some principal geomorphic types include grabens in the bottom basin, taphrogranic valleys and sea-bottom volcanoes et al. Taphrogeny and volcanic activity play the important role in the geomorphic development.3. It is taphrogranic extension from SW to NE and the migration of the centers of spreading from NE to SW that give rise to the four NW-SE zones of the Okinawa zones mentioned above.4. There are two stages in the geomorphic development, namely: the taphrogranic structural geomorphy stage and the volcanic structural geomorphy stage, which are dominated by two development stages of the Okinawa Trough.5. Now, the Okinawa Trough can be regarded as in the initial stage of back-arc extension and will be developing towards the crost oceanization, leading to the "geomorphic oceanization" of the Trough.更多还原