The Hidaka alpine range is characterized by metamorphism in the andalusite-sillimanite-cordierite facies and is located at the southern end of the SSE-NNW-trending tectonic arc of Hokkaido. The axial zone of the Hidaka range is composed of migmatites which formed at the expense of metamorphic rocks in the surrounding series of Mesozoic age. Gabbros, some of which contain peridotite, outcrop in a longitudinal zone paralleling the structural trend. The concomitant relationship between these two series is suggested by the occurrence of gabbros in or on the borders of the migmatite domes and by the causal relationship between the basic intrusions and the migmatizations.

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