Slab window-related magmatism caused by the Kula-Pacific ridge subduction beneath the Eurasia continent in the Cretaceous

A model with a slab window is tectonically and magmagenetically depicted for interpretation of the magmatism on the eastern margin of the Eurasia continent in the Cretaceous. It has isochronously caused the active magmatisms in a row obliquely stretching across the margin and migrated about 7000 km along the margin from the southern part of Guangxi in South China to the far eastern region of Russia. The slab window came into being at the subduction part of the oceanic ridge between Kula and Pacific plates and promoted the upwelling of the hot asthenosphere to fill the window gap. Some of the gabbroic rocks exposed in this area may have transported heat from the slab window into the lower crust, where the granitic magma is generated by the assimilation with the crustal matter to form the greater magma chambers. The window width and the migration speed are taken on the basis of the statistical analysis of the granite age data in Southwest Japan, which corresponds to the reference field in the Eurasia east margin based on recommended geoscientific data and information.