The extension of the Dabie-Sulu orogenic belt in Korean Peninsula: Based on 40Ar/39Ar Tectonic chronology

In this study, 40Ar/(39) dating was done on 14 biotites or hornblende mineral separated from mylonites and gneiss in shear belts from different tectonic position of Korean Peninsula. Depending on the deformation characteristics of geological sections and associative tectonic chronology data, comparison was made between Korean Peninsula (include Rimjingang Belt and Okchon Belt) and Dabie-Sulu orogenic belt, and the eastward extension of Dabie-Sulu orogenic belt was discussed. As a result, Rimjingang belt of Korean Peninsula is similar to Beihuaiyang tectonic belt of North Dabie orogenic belt and north of Sulu belt in deformation characteristics and era, and Okchon belt is similar to South Dabie belt in the same ways. Furthermore, three main Mesozoic tectonic event of Korean Peninsula could be recognized such as: Collide Stage (T-1, similar to 210 Ma), Orogenesis Stage (T-2-J(3) 200 similar to 150Ma), Extensional Stage (K1-2, 140 similar to 90 Ma). On these bases, the geologic body between Rimjingang belt and Okchon belt is a holonomic Mesozoic orogene, as the eastern extending part of Dabie-Sulu orogenic belt, and "Gyonggi Massif" should be redefined as a part of the orogenic belt.