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Title Transcription
シマネケン サクラエチョウ カラ イワミチョウ ニ カケテ ブンプ スル サクラエ ソウグン ノ ソウジョ ト コウゾウ
Title Alternative (English)
Geologic structure and stratigraphy of the Sakurae Group around Sakurae Town and Iwami Town,Shimane Prefecture
File
language
jpn
Author
Aoyama, Miki
Komuro, Hiroaki
Description
The Oligocene Sakurae Group,in which the Sakurae cauldron in central Shimane Prefecture is formed,is mainly composed of acidic to intermediate volcanic and plutonic rocks.The mapped area covers 9×4 kms on the southern bank of the Gonokawa river.The upper part of this group in the area investigated is characterized by densely welded tuff up to several hundred meters in thickness.A semi-circular collapse structure rimmed by a ring fault and an arcuate anticlinal axis cuts the general trend of the Sakurae Group.However,the inside of this collapse shows a half basin with a steeply-dipping inner margin and a gently dipping base.This suggests that the subsidence of the half-circular collapse was concurrent with the accumulation of the inner welded tuff,which represents a catastrophic pumice eruption.Many intermediate to acidic intrusions occur in the area.A granite body was emplaced mainly outside the half-circular collapse,whereas porphyry intrusions are concentrated along this collapse margin.Numerous unconsolidated andesitic fragments also occur in the welded tuff.Accordingly,the intermediate magma seems to have risen along the collapse margin during and after the pumice eruption.
Journal Title
島根大学地球資源環境学研究報告
Volume
20
Start Page
109
End Page
115
ISSN
13439774
Published Date
2001-12-28
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+
中山勝博助教授追悼特集
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