Cretaceous to Paleogene Granitic rocks in southwest Japan and Korean peninsula and their implications for continental growth

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Cretaceous to Paleogene magmatism in southwest Japan started near the present-day Median Tectonic Line at approximately 95Ma, and had migrated northward to continue until at least 33Ma. Bulk rock compositions of the rocks have changed systematically with time. Combining these data, it is suggested that ridge subduction induced the magmatism, and then the thermal propagation, migration of dehydration loci, and change in subduction angle may have caused the northward migration. Integrating these results with the analyses for the origin of simultaneous granitic magmatism in Korean peninsula indicates that the mantle has acted as the heat source through ridge subduction and delamination.