Formation temperature of perlite and its texture by heating experiments of obsidians from Hokkaido

Ryo IKEYAUCHI; Keiji WADA; Takeaki SAITO

Presentation information

Oral

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG61_2AM2] Petrology, Mineralogy and Resource Geology

Fri. May 2, 2014 11:00 AM - 12:45 PM 311 (3F)

Convener:*Toshiaki Tsunogae(Faculty of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba), Koichiro Fujinaga(Department of Systems Innovation, School of Engineering, University of Tokyo), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University), Chair:Koichiro Fujinaga(Department of Systems Innovation, School of Engineering, University of Tokyo), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University)

11:15 AM - 11:30 AM

[SCG61-09] Formation temperature of perlite and its texture by heating experiments of obsidians from Hokkaido

Ryo IKEYAUCHI¹, *Keiji WADA¹, Takeaki SAITO¹ (1.Hokkaido University of Education at Asahikawa)

Keywords:obsidian, heating experiment, perlite, vesiculation, glass

The obsidians from Hokkaido were heated in electric furnaces to transform the perlite in a form like pumice in vitreosity, because remained water in obsidians becomes the gas and makes air bubbles by heating. We examined foaming temperature of the obsidians from 13 samples in 7 Hokkaido sources, and the relations with its foaming temperature and the water content of the obsidians. In addition, we changed a heating temperature and a condition of the heating time and examined the difference in foaming form of the perlite.Finally, we considered a relations with foaming process of the obsidians and the internal structure of the perlite through the microscopy of the perlite.