ENDOGENE ORIGIN OF PERLITE, OBSIDIAN AND PUMICE (EXPERIMENTAL SIMULATION)

Abstract

Our experimental simulation of the dehydration of silicic water-bearing melts, together in petrographic and physicochemical analysis of the natural features of silicic volcanic activity, confirms that silicic glasses of the obsidian-perlite-pumite series have a common origin. The formation of structural-textural varieties of these glasses, like the differences in their water content, result from the dynamic features of dehydration, decompression, vesiculation and cooling of intruded water-rich silicic magmas with special physicochemical properties.