The Okhotsk-Chukotka Volcanic Belt (OCVB) is a Cretaceous volcanic belt in northeastern Eurasia. It is one of the largest subduction-zone related volcanic provinces in the world, stretching some 3200 km and comprising about 2 million km3 of volcanic and plutonic material. The volcanism within the volcanic belt was related to the subduction of the ancient Kula Plate, which moved in a northward direction about 55 million years ago.
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Okhotsk-Chukotka Volcanic Belt Wikipedia(Text) CC BY-SA