东北亚大陆边缘中新生代构造事件与演化序列

MESOCENOZOIC TECTONIC EVENT AND EVOLUTION OF NORTHEASTERN ASIA CONTINENTAL MARGIN

东北亚大陆边缘地区三叠纪时洋盆扩张作用较强，形成由多个小洋盆和一些微陆块或地体组成的复杂洋区；侏罗纪该洋区逐渐收缩、聚敛直至关闭，并奠定大陆边缘轮廓；白垩纪是该区安第斯型大陆边缘的形成和演化时期；

During Triassic period,a complicated oceanic area was formed,which consists of many small oceanic basins and some microcontinents or terrenes,due to spreading of oceanic basin in the region of Northeastern Asia continental margin.During Jurassic period the oceanic area began to contract and converge increasingly,at last being closed.Thus,the outline of continental margin was formed.Cretaceous is the period in which the Andeantype continental margin was formd and evolved in the area.Cenozoic era is the forming and developing stage of islandarctype continental margin.