Density model of the lithosphere of the Tsushima Basin, Sea of Japan
2-D density modeling along the sublatitudinal deep seismic sounding profile in the Tsushima Basin of the Sea of Japan was performed. The available data allow us to presume that the opening of the Tsushima Basin occurred in conditions of an abnormally heated mantle and was accompanied with intrusion of mantle material into the crust of the basin and the zone of transition from the basin to the continental margin of the Korean Peninsula attended by formation of oceanic crust. As compared with the normal oceanic crust thickness, the increased thickness of the crust of the basin was conditioned by accumulation of a large amount of terrigenous material and volcanogenic rocks in the upper part of the crust and underlying of mantle material in its lower part.