JaLCDOI 10.18926/ESR/58575
タイトル(別表記) Schistose fault related rocks from the Sangun Metamorphic Rocks, Kawakita area, Misaki Town, Okayama Prefecture, SW Japan
フルテキストURL esr_026_019_024.pdf
著者 松下 実礼| 鈴木 茂之|
抄録 The crystalline schist which is representatively exposed in the Innerside of Southwest Japan is called the Sangun Metamorphic Rocks (SMR). In Kawakita area, Misaki Town, Okayama Prefecture, schistose fault rocks which is newly described in below are intercalated in the SMR. The rocks are composed of lenticular fragments of pelitic, basic siliceous rocks and quartz vein with siliceous to pelitic matrix. The fine-grained muscovites which define schistosity penetrate the rocks. Major direction of layer which though to reflect slip plane is subparallel to the schistosity. The long axis of some fragments are slightly oblique to the schistosity. The combination of the two sets of planes is considered to be a composite planar fabric. These occurrences suggest that the rocks are fault rock before the Sangun Metamorphism and named as schistose fault rocks. Lenses of cataclasite and myronite are accompanied. Planar thin (about 10cm in thickness) brittle fault rock is also associated. These shear deformed rocks form units of layer (shear zone) of 10 to 100m in thickness, and are concordantly intercalated in the surrounded normal schists. Active periods of the shear zones had several times from before and after the event of the Sangun Metamorphism.
キーワード Sangun Metamorphic Rocks regional metamorphism shear deformation schistose fault rock
出版物タイトル Okayama University Earth Science Report
発行日 2019-12-27
開始ページ 19
終了ページ 24
ISSN 1340-7414
言語 Japanese
著作権者 © 2019 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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