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Abstract |
The geology and lithological and petrographical properties of the "Shirasu" in the northeastern part of the Aira volcanic region are described briefly in this paper. The refractive indices of the glas...s are 1.497-1.501, the chemical compositions of the pumice fragments are SiO_2 73, and the "median diameters" (Md) obtained by mechanical analysis (excluding large fragments > 4 mm) are 0.16-0.28mm. It is noticed that the "older pumice flow" differs from the "Shirasu" in distribution, contour lines for Md and petrographic properties, and its eruptive center seems to be found in the northern part of the Kirishima volcano.show more
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