Internal structures of a subaerial dacite cryptodome at Usu volcano, Hokkaido, Japan (特集 2003年度実施の地域との共同研究の報告)
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概要
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A partly eroded, subaerial, dacite cryptodome at Showa-Shinzan, Usu volcano, Hokkaido, Japan, displays its internal structures, and provides an excellent opportunity to study contact relationship between cryptodome and overlying sediment. The margin of the cryptodome comprises two facies: inner coherent dacite and outer dacite breccia. The coherent dacite facies is ~5 m in the exposed section, and consists of homogeneous or weakly flow-banded, feldspar-phyric dacite. The dacite breccia facies envelope the coherent dacite facies, and is 4-5 m thick. The breccia is monomictic, non-stratified and consists of angular dacite clasts up to 15 cm across in a cogenetic matrix. The overlying sediment directly covers the dacite breccia facies, and comprises reddish-brown, fluvial deposit. The dacite breccia formed by fracturing of coherent dacite in response to cooling contraction, and shearing of the fractured dacite due to movement of the growing cryptodome.
- 室蘭工業大学の論文
- 2004-11-30
著者
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後藤 芳彦
Department Of Geology And Mineralogy Faculty Of Science Hokkaido University
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Goto Yoshihiko
Department Of Geoscience And Technology Graduate School Of Engineering Tohoku University
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Ito Yukie
Department Of Civil Engineering And Architecture
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Yokoyama Yu
Department Of Civil Engineering And Architecture
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Yokoyama Yu
Department Of Chemistry Faculty Of Science Osaka University
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MATSUI Tomoyuki
Date City Hall
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MIMATSU Saburo
Mimatsu Memorial Hall
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伊藤 有希恵
Department of Civil Engineering and Architecture
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横山 由
Department of Civil Engineering and Architecture
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