The vesicular glass from Ko??fels, Tyrol, contains grains of quartz that have been partially melted but not dissolved in the matrix glass. This phenomenon has been observed in similar glasses formed by friction along a thrust fault and by meteorite impact, but not in volcanic glasses. The explosion of a small nuclear device buried behind a steep slope produced a geologic structure that is a good small-scale model of that at Ko??fels. Impact of a large meteorite would have an effect analogous to that of a subsurface nuclear explosion and is the probable cause of the Ko??fels feature. ?? 1964 Springer-Verlag.
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Fused rock from Ko??fels, Tyrol
Tschermaks Mineralogische und Petrographische Mitteilungen