Partial melting of the crust caused by heating of basalt magma-Generation of felsic magma in the subduction zone

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The major- and trace-element compositions, and Sr and Nd isotopic data were presented for Oligocene to Quaternary basaltic and felsic volcanic rocks including dacite and rhyolite from Southwest Hokkaido and North Hokkiado. These data showed that felsic magmas were generated by partial melting of the lower crustal rocks beneath SW Hokkaido and North Hokkaido. Asthenosphere-derived basaltic magmas have both been erupted at the surface, and fluxed and heated the lower crust causing melting, and producing coeval felsic magmas.