Geology
The Hidaka Mountains formed in the late Quaternary as part of the outer arc of the western end of the Kurile arc. They were formed by the uplift resulting from the collision with the Kurile arc and the Northeast Japan Arc. The Hidaka mountains no longer appear to be uplifting.
The western end of the range is high P/T metamorphoseed Jurassic accretionary complex as part of the Kamuikotan belt. This is characterized by sedimentary rocks from the Cretaceous and Jurassic-Lower Cretaceous periods. The eastern end of the range is tertiary metamorphic rock as part of the Hidaka Metamorphic belt. This is characterized by low to medium pressure metamorphic rocks with sedimentary rocks from the Cretaceous-Lower Miocene. Plutonic rocks intrude into these structures. For the most part, the Hidaka mountains are composed of schists, migmatites, gneisses, and granites.
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