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Russian Geology and Geophysics

2004 year, number 4

CENOZOIC CONTINENTAL-MARGIN VOLCANISM IN THE PACIFIC AND BERING SEA SECTORS OF KAMCHATKA: GEODYNAMIC IMPLICATIONS

N.A. Bogdanov† and V.D. Chekhovich
Institute of the Lithosphere of Marginal and Intracontinental Seas, Russian Academy of Sciences, 22 per. Staromonetnyi, Moscow, 109180, Russia
Keywords: Continental-margin volcanic belts, subduction, collision, transform faults, Kamchatka
Pages: 391-398

Abstract

The tectonic position and ages of suprasubduction continental-margin volcanoplutonic belts controlled by their Cenozoic geodynamic environments are notably different in the Pacific and Bering Sea sectors of Kamchatka and southern Koryakia. In pre-Cenozoic time the two sectors were separated by a long-existing transform fault whose western segment now coincides with the Komandor strike-slip fault and the eastern segment is clearly traceable by satellite gravity data on the Pacific floor southeastwards on the continuation of the Komandor fault.