High-K basaltic trachyandesite xenoliths in pyroclastic deposits from the Bezymianny volcano (Kamchatka)
| Autor: | A. B. Perepelov, V. D. Shcherbakov, V. O. Davydova, P. Yu. Plechov |
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| Rok vydání: | 2018 |
| Předmět: |
Basalt
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences biology Andesite Andesites Geochemistry Pyroclastic rock Geology 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Geophysics Volcano Xenolith 0105 earth and related environmental sciences |
| Zdroj: | Russian Geology and Geophysics. 59:1087-1099 |
| ISSN: | 1068-7971 |
| Popis: | Bezymianny is an active andesitic volcano of the Klyuchevskaya group, and its eruptive products are xenolith- and enclave-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, 0.45–1.95 wt.% K2O) crystallized in the temperature range 1120–840 °C in products of modern eruptions (2007, 2011, 2012). Basaltic trachyandesite differ systematically in petrologic and geochemical characteristics from all previously studied rocks from the Bezymianny volcano. They correspond to the clinopyroxene–plagioclase porphyry rocks from the foot of the Tolbachik volcanoes. |
| Databáze: | OpenAIRE |
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