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Title Transcription
シマネケン ミサトマチ ニ ミラレル コダイサンキ センナイ コールドロン ノ ナントウブ ノ コウゾウ ニ ツイテ
Title Alternative (English)
Geologic structure of the southeastern part of the Kawauchi cauldron, Misato Town, Shimane Prefecture, SW Japan
File
language
jpn
Author
Okamoto, Yasuko
Komuro, Hiroaki
Description
The Oligocene Kawauchi Group in central Shimane Prefecture consists of andesitic to rhyodacitic lavas and pyroclastic rocks. However, neither detailed lithological nor stratigraphic descriptions of these rocks have been reported to date.
From the base upward, the Mimata subgroup consists of a lower andesite lava, rhyolitic lapill tuff, rhyolitic welded tuff, an upper andesite lava, and rhyodacite tuff. Acidic to intermediate dikes and plutons occur inside the cauldron or along the cauldron rim.
Autobrecciated structure is observed in the andesite‘sills' reported by Kano et al.(2001), and thus these‘sills’are considered to be lavas. The Mimata subgroup is in fault contact with the basement rocks. These faults strike N-S and E-W. Accordingly, the cauldron rim seems not to be arcuate but is rectilinear in plan view, although Matsuda(1985)described a circular collapse structure. This suggests that the Kawauchi cauldron may be a polygonal cauldron.
Journal Title
島根大学地球資源環境学研究報告
Volume
25
Start Page
1
End Page
5
ISSN
13439774
Published Date
2006-12-27
NCID
AA11455176
DOI(SelfDOI)
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
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