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Low-K tholeiitic basalts are found from Sapporo-dake and Asari-dake volcanoes in the western region of Sapporo considered as the back-arc side of SW Hokkaido. K-Ar ages of these basalts are 2.6±1.0 Ma (Asari-dake volcano) and 1.6±0.6 Ma (Sapporo-dake volcano) comparable with those of andesitic rocks distributed in the same area. These basalts are similar to the basalts from the trench-side of NE Honshu in the major and trace elements chemistry. Chemical zonation of volcanoes trending N-S direction in the central NE Japan arc can extend to its northern end based on the present results. Because the trench axis bends from N-S to NE-SW direction off the coast of SW Hokkaido, this zonation cannot be explained by the present arctrench system.

gankō/gankou

Chemical zonation of volcanoes at the northern end of NE Japan arc: K-Ar ages and geochemistry of some Pliocene and Pleistocene basalts from the western region of Sapporo, southwestern Hokkaido.