1990 Volume 40 Issue 224 Pages 365-384
Moderate amounts of data on the Jurassic granitoids in the Hida belt and South Korea have been accumulated. From the data presented, it will be seen that similarities and disssimilarities of the Jurassic granitoids between two regions. 1) Modal compositions of Jurassic granitoids are somewhat similar between the two regions; 2) radiometric ages, series, such as magnetite-and ilmenite series, initial strontium ratios, and REE patterns of the Jurassic granitoids between the two regions are different. The facts mean that source materials and genesis of the Jurassic granitoids between the two regions were different. The REE patterns suggest that the Jurassic granitoids of South Korea were derived by partial melting of lower crust or by fractional crystallization of hornblende from quartz dioritic magmas, whereas Jurassic granitoids in the Hida belt were mainly differentiated by the insitu fractional crystallization. From the difference in the initial strontium ratios between the two regions, it is suggested that the Jurassic granitoids in South Korea may have been situated in the continental side compared with the Jurassic granitoids in the Hida belt.
