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The Okhotsk-Chukotka volcanic belt: Age of its northern part according to new Ar-Ar and U-Pb geochronological data |
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| Authors: | P. L. Tikhomirov V. V. Akinin V. O. Ispolatov P. Alexander I. Yu. Cherepanova V. V. Zagoskin |
| Affiliation: | (1) Geological Faculty, Moscow State University, Moscow, Russia;(2) Northeast Research Institute, Far East Division, Russian Academy of Sciences, Magadan, Russia;(3) Mineral Exploration Research Centre, Department of Earth Sciences, Laurentian University, Sudbury, Canada;(4) Scottish Universities Environmental Research Centre, Glasgow, Great Britain;(5) ZAO Chaunskoe Mining Enterprise, Pevek, Russia;(6) State Anyui Mining Enterprise, Bilibino, Russia |
| Abstract: | Current geochronological data on the Okhotsk-Chukotka volcanic belt (OCVB) and relevant problems are discussed. The belt evolution is suggested to be modeled based on 40Ar/39Ar and U-Pb dates more useful in several aspects than common K-Ar or Rb-Sr dates and methods of paleobotanical correlation. Based on new 40Ar/39Ar and U-Pb dates obtained for volcanic rocks in the OCVB northern part, the younger (Coniacian) age is established for lower stratigraphic units in the Central Chukotka segment of the belt, and the eastward migration of volcanic activity is shown for terminal stages of this structure evolution. |
| Keywords: | Okhotsk-Chukotka belt active continental margins volcanism stratigraphy geochronology |
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