LONG-LIVED VOLCANIC CENTERS OF KAMCHATKA: TYPES OF CONES, GROWTH TIME SPANS, VOLUMES OF ERUPTED MATERIAL, PRODUCTIVITIES, ROCK PROPORTIONS, AND TECTONIC SETTINGS

Abstract

Data from literature have been verified and new estimates have been obtained for the total volumes of erupted material, average productivities, life spans, and other parameters of Kamchatkan volcanic centers that operated for periods of 350-700 to 1500-2500 thousand yr. The absolute volumes of basic, intermediate, and acid rocks have been estimated and their ratios determined in % of the total masses of erupted products for individual volcanoes, for each volcanic zone, and for Kamchatka as a whole. It is shown that the bulk of the rocks was derived from basic magmas.