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Title Transcription
セイナン ニホン ナイタイ ノ ペルムキ サンセイ カサイガンルイ ソノ1
Title Alternative (English)
Permian silicic volcaniclastic rocks in the Inner Zone of Southwest Japan (Part 1)
File
language
jpn
Author
Tokuoka, Takao
Naka, Takahito
Nishimura, Kouichi
Pillai, D.Dhana.L.
Description
Silicic volcanogenic sedimentary rocks (predominantly redeposited silicic tuffs and very rarely lapilli tuffs) occur within Permian (especially Middle Permian) strata in the Akiyoshi-Nishiki, Maizuruand Ultra-Tamba (UT3) terranesofthe Chugoku region. These rocks have received very little attention, however their existence has major implications for interpretation of the geotectonic history of these terranes. It is generally accepted that a Middle to Late Permian orogeny called the Akiyoshi or Honshu Orogenic Movement occurred in the inner side of Southwest Japan. We propose that the silicic rocks described above were the products of arc volcanisms preceding this disturbance. Silicic tuffs (mostly vitric or crystal vitric tuffs, and sometimes crystal tuffs) are described in detail from the Muikaichi and Nishiki areas of the Akiyoshi-Nishiki Terrane, Yanahara area of the Maizuru Terrane and Kozuki area of the Ultra-Tamba Terrane. Tuffaceous beds, several to tens of centimetres thick (sometimes attaining more than several tens of metres in thickness) are interlaminated with mudstones and argillites. The constituent silicic pyroclasts are interpreted to have been transported by turbidity currents and/or debris flows from the flanks of adjacent volcanic arcs into thick mudstone laminated sequences. The evidence suggests that sedimentary sequences of all three terranes received detritus from active arc volcanoes during Middle Permian.
Journal Title
Geological reports of Shimane University
Volume
7
Start Page
49
End Page
68
ISSN
0287816X
Published Date
1988-06-30
NCID
AN00054980
Publisher
島根大学理学部地質学教室
Publisher Aalternative
Department of Geology, Faculty of Science, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Faculty of Science and Engineering
Remark
1-11 / 1982-1992
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