High-K basaltic trachyandesite xenoliths in pyroclastic deposits from Bezymianny volcano (Kamchatka)статья
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Дата последнего поиска статьи во внешних источниках: 20 октября 2018 г.
Аннотация:Bezymianny is an active andesitic volcano of the Klyuchevskaya group and its eruptive products are xenoliths- and enclaves-bearing basaltic andesites and dacites. Here we report the first occurrence of clinopyroxene-plagioclase high-potassium basaltic trachyandesite xenoliths (51.84-53.00 wt.% SiO2, 0.95-1.95 wt.% K2O) crystallized in the temperature range 1120-840°C in products of modern eruptions (2007, 2011, 2012). Basaltic trachyandesite systematically differ in petrological and geochemical characteristics from all previously studied rocks from Bezymianny volcano. They correspond to the clinopyroxene-plagioclase-porphyry rocks from the foot of Tolbachik volcanoes.