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島根大学教育学部紀要. 自然科学 Volume 24 Issue 2
published_at 1990-12-25
火山ガラスの化学組成から見た大阪層群のテフラ
Tephra Deposits in the Osaka Group as seen from chemical compositions of their volcanic glasses
Miura Kiyoshi
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The Plio-Pleistocene Osaka Group was deposited in the Second Setouchi depression and its thickness attains up to 1,000m.
Osaka Group has twelve marine clay beds in the upper part (Ma-1, Ma-0, Mal-10) and are intergalated by about fifty layers of thin volcanic ash as marker-tephra.
The author studied major element chemical composition of glass of these marker-tephras using a microprobe analyzer and described the successful characterization for correlation to be made for these marker-tephras.
Osaka Group has twelve marine clay beds in the upper part (Ma-1, Ma-0, Mal-10) and are intergalated by about fifty layers of thin volcanic ash as marker-tephra.
The author studied major element chemical composition of glass of these marker-tephras using a microprobe analyzer and described the successful characterization for correlation to be made for these marker-tephras.
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