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From the Late Cretaceous to the Quaternary, the northeastern end of the Eurasian margin experienced a complicated tectono-magmatic history including the subduction of the Izanagi-Pacific ridge in the Eocene time, the opening of the Japan and Kuril basins and the associated trench migration in the Oligocene to Miocene time, the possible collision of the Eurasian plate and the North American (Okhotsk) plate around the Oligocene to Miocene time, and subduction zone magmatism in all periods.

In central Hokkaido (Japan), Eocene-Miocene plutonic bodies are distributed along the north-south orientated Hidaka Magmatic Zone (HMZ). We report new zircon U-Pb ages and geochemical data from plutonic rocks in the HMZ, which reveal Miocene compositionally bimodal magmatism; the felsic magmatism present is characterized by island-arc geochemical signatures. Trace element compositions of the Miocene mafic …