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

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.