91�鶹������Ʒ����

The Geopark consists of Precambrian and Paleozoic metamorphic rocks, Jurassic and Cretaceous granites, Cretaceous volcanic rocks, Quaternary basalt, and various types of soil including soil layers during glacial periods. This region includes one of the major tectonic provinces, named the “Imjingang Belt”, which resulted from the collision of the Sino-Korean and Yangtze cratons in the Paleozoic, and is regarded as the lateral extension of the Qinling-Dabie-Sulu Belt in eastern China, which is one of the major tectonic features in East Asia. The Late Quaternary Hantangang River Volcanic Field was formed when the intraplate volcanism activities were led by fissure-type eruptions. The basaltic lava ran through the paleo-channel for over 110 km, forming volcanic rocks. Later channels began to develop on flat-topped volcanic landform by rejuvenation of the Hantangang River. The river displays a unique volcanic topography, created by the continuous fluvial erosion dissecting deep gorges in the flat plateau. Such geological evidence can be clearly found along the many geosites. The volcanic landform is also quite unique along the steep-sided river gorges. Columnar joints made up of basalt form steep cliffs, whereas areas formed by granites and metamorphic rocks show a typical V-shaped valley. A clear lithologically controlled fluvial erosion process between granite and basalt is also an additional distinctive feature. A comparison with other volcanic World Heritage Sites and Global Geoparks indicate that the volcanic landforms in this Geopark are outstanding worldwide in terms of being 'a volcanic landform with fluvial system', thus having high representativeness and rarity values.