Paleomagnetism of Cambrian to Jurassic sedimentary rocks from the Ogcheon zone, southern part of Korean Peninsula.

A paleomagnetic study was performed on sedimentary rocks in the Ogcheon zone. The area is unique in the southern part of the Korean Peninsula for the existence of a sequence of sedimentary rocks from the Cambrian through the Jurassic periods. Although the rocks were strongly overprinted with a secondary magnetization, detailed thermal demagnetization was effective in isolating a component with a very high blocking temperature in a few sites. This component is thought to be the primary magnetization. The paleomagnetic directions from these sites, which are Carboniferous, Permian and Triassic in age, suggest that the Ogcheon zone had belonged to the South China Block rather than the North China Block.