The Okhotsk-Chukotka Volcanic Belt (OCVB) is a Cretaceous

Cretaceous

The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...

 volcanic belt

Volcanic belt

A volcanic belt is a large volcanically active region. Other terms are used for smaller areas of activity, such as volcanic fields. Volcanic belts are found above zones of unusually high temperature where magma is created by partial melting of solid material in the Earth's crust and upper mantle....

 in northeastern Eurasia

Eurasia

Eurasia is a continent or supercontinent comprising the traditional continents of Europe and Asia ; covering about 52,990,000 km2 or about 10.6% of the Earth's surface located primarily in the eastern and northern hemispheres...

. 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

Kula Plate

The Kula Plate is an oceanic tectonic plate under the northern Pacific Ocean south of the Near Islands segment of the Aleutian Islands. It is subducting under the North American Plate at the Aleutian Trench and is surrounded by the Pacific Plate...

, which moved in a northward direction about 55 million years ago.