The Okhotsk-Chukotka volcanic belt (OChVB) formed over 25 Ma from the middle Albian to the Cenomanian at the boundary of the continental Verkhoyansk-Chukotka and the Koryak-Kamchatka collages of terranes as a special tectonic unit of the Earth's crust composed of subaerial volcanic rocks extending for 3000 km. In regard to the oceanic margin, the inner, outer, and flank zones of the OChVB have been recognized. The complex structure of terranes in the basement and the OChVB itself resulted in the formation of diverse epithermal deposits. Porphyry copper-molybdenum deposits are concentrated in the inner zone. The outer zone is characterized by gold-silver ore mineralization and a variety of tin deposits. Silver-base-metal deposits (Dukat, Lunny, Arylakh, etc.) are confined to the rift-related volcanic trough that complicates the OChVB between the Yana-Kolyma and Omolon terranes.

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According to the concepts of accretionary tectonics, the region of interest was a dynamically evolving active continental margin during Mesozoic/Cenozoic time; this is reflected in the generation of nine volcano plutonic belts that successively evolved from northwest to southeast. Most of these evolved in parallel with the present day location of the Kuril-Kamchatka deep sea trench: the Late Jurassic/Early Cretaceous Uda-Murgali belt (UMVB) the Uyandina Yasachnaya (UYVB), the Oloi belt (OVB), the Late Creta ceous/Paleogene Okhotsk-Chukchi belt (OChVB), the Late Cretaceous/Paleogene East Sikhote Alin' belt (ESVB), the Eocene/Oligocene Koryak-West Kamchatka belt (KWKVB), the Oligocene/Quaternary Cen tral Kamchatka belt (CKVB), and the Pliocene/Quaternary East Kamchatka belt (EKVB). The successively younger age of the volcanic belts since the Early Cretaceous is in correspondence with the displacement of the volcanic arc-trench system toward the Pacific Ocean. Apart from the above mentioned volcanogenic belts, the Omolon craton terrane also contains the pre accretionary Devonian Kedon marginal volcanogenic belt (KVB). All the volcanogenic belts and the surrounding perivolcanic zones of tectono magmatic activa tion (TMA) form the world largest metallogenic province with a polychronous volcanogenic-plutonogenic metallization of various compositions.

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