PYROCLASTIC SURGE DEPOSITS OF BEZYMYANNYI VOLCANO

Abstract

The 1956 and 1984-1986 eruptions of Bezymyannyi were accompanied by the formation of ground and ash cloud surges. The mega- and microscopic structural and textural features of the resulting deposits are described, as well as their chemical and mineral compositions, particle-size distributions, and physical properties. The patterns of the different varieties of pyroclastic surge deposits specified are a possible index to their recognition and identification elsewhere.