We present the results of an analysis of the chemical composition for the volcanic glasses discharged by the summit eruption and G.S. Gorshkov flank vent at Klyuchevskoi Volcano in 2020–2021. The data on the chemical and mineral compositions of basaltic andesites produced at the initial stage of the G.S. Gorshkov vent activity are given. The compositional variations of the volcanic glasses from the summit and the subsequent flank eruptions reflect the degree of crystallinity in the tephra particles and the successive change of microlite populations during crystallization of a single parental magma. Comparison of the volcanic glass chemistry from recent eruptions with similar data for the products of the preceding eruptive episodes in 2010 and 2016 shows their complete identity, which indicates a constant composition of the basaltic andesite magma that supplies the present-day volcanic eruptions.
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Gorbach et al. (2022) studied this question.
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