Continental- Margin Structure of Northeast China and Its Adjacent Areas

The continental margin of Northeast China and its adjacent areas is composed of two tectonic belts. The inner belt is a collage made up of fragments resulting from breakup of an old land with the north part related to the evolution of the Palaeo-Asian Ocean and the south part to the evolution of the Palaeo - Pacific Ocean. The outer belt is a Mesozoic terrane, which is a melange made up of fragments of the Late Palaeozoic to Early Mesozoic oceanic crust and the Late M esozoic trench accumulations.There existed another ocean-the Palaeo - Pacific Ocean during the period from the closing of the Palaeo-Asian Ocean to the opening of the modern Pacific Ocean or from the Devonian to Jurassic, and the ocean-floor spreading of the Palaeo - Pacific Ocean led to the formation of the above-mentioned tectonic belts. The development of the strike-slip fault system after the Late Jurassic and the formation of an epicontinental volcano -plutonic rock belt in the Late Cretaceous to Early Tertiary are attributed to the interaction between the modern Pacific plate and the Eurasian plate.

中国东北及邻区大陆边缘构造

中国东北及邻区大陆边缘包括两个构造带。内带由裂解的古陆碎块组成,其北部与古亚洲洋的演化有关,南部与古太平洋演化有关。外带由中生代地体组成。它们是晚古生代到早中生代的洋壳碎块与晚中生代的深海沟堆积组成的混杂体带。 吉亚洲洋封闭后到现代太平洋板块活动前,即由泥盆纪到侏罗纪曾存在过另一个大洋——古太平洋,其洋底扩张活动形成了上述的构造带。晚侏罗世后本区发育左旋平移断裂系,晚白垩世—早第三纪形成了陆缘火山-深成岩带。这些则是现代太平洋板块与欧亚板块相互作用的结果。