Abstract:This study reports a unique pumice texture generated by the instantaneous bursting of melt inclusions in alkali feldspars during the 946 CE Plinian eruption at Baekdusan. The burst produced super-vesicular (80−90 vol.% voids), subspherical (i.e., non-sheared), and subcentimeter-sized “bubble pockets” indicating their formation at the moment of magma fragmentation. Their volume fraction (6–24 vol.%) suggests that the melt inclusions acted as an additional volcanic gas source and increased significantly the volu… Show more
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