中朝板块及其北部的西伯利亚板块，是亚洲东部晚古生代的两大古板块。近年来的地质工作陆续发现，在中朝板块之北侧的索伦山—二连以东地区，存在着晚古生代的大洋壳残余。这表明，在晚古生代的一个时期中，中朝古板块和西伯利亚古板块之间曾一度被大洋所隔。进一步探讨该大洋之存在及其所占据的范围，测定两大古板块的古纬度，搞清它们 The Sino-Korean plate and the Siberian plate in its northern part are the two ancient plates of late Paleozoic in eastern Asia. In recent years, the geological work gradually discovered that in the area north of the Sino-Korean Plateau, the Solenshan-Erlian-East region, there are Late Paleozoic remnants of the oceanic crust. This shows that during a period of late Paleozoic, the ancient plate between China and the DPRK and the ancient plate of Siberian once separated by the ocean. To further explore the existence of the ocean and the extent of its occupation, determine the ancient latitudes of the two ancient plates, find out