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ID 56695
JaLCDOI
Sort Key
7
フルテキストURL
著者
Knittel, Ulrich Clay and Interface Mineralogy, RWTH Aachen University
Walia, Monika Department of Geosciences, National Taiwan University
Suzuki, Shigeyuki Graduate School of Natural Science and Technology, Okayama University
Lee, Yuan-Hsi Department of Earth and Environmental Sciences, National Chung-Cheng University
抄録
The high-P/low-T Sanbagawa Metamorphic Belt that traverses SW Japan, has been subdivided into two belts thought to have been metamorphosed at ca. 120 Ma and at ca. 65 Ma (‘Sanbagawa Metamorphic Rocks’ and ‘Shimanto Metamorphic Rocks’). The subdivision was based on the assumption that metamorphism occurred at ca. 116 Ma, largely based on an early Rb-Sr isotope study and zircon data obtained for the eclogite unit of the Sanbagawa Belt, whereas in some parts of the belt detrital zircons of late Cretaceous age (90-80 Ma) were discovered. Analysis of detrital zircons sampled from two sites within the area considered to expose the older ‘Sanbagawa Metamorphic Rocks’, including the area investigated by the Rb-Sr study, reveals the presence of zircons younger than 95 Ma in all samples and some grains as young as 80 ± 4 Ma. It is therefore concluded that the Sanbagawa Belt is one single tectonic entity that formed in the Late Cretaceous though it contains older components, including fossiliferous clasts, older basic meta-volcanics and eclogite units that may record earlier metamorphic events.
キーワード
U-Pb zircon dating
Sanbagawa Metamorphic Belt
Late Cretaceous
Asemi River
出版物タイトル
Okayama University Earth Science Report
発行日
2018-12-27
25巻
1号
出版者
岡山大学理学部地球科学教室
出版者(別表記)
Department of Earth Sciences, Faculty of Science, Okayama University
開始ページ
39
終了ページ
48
ISSN
1340-7414
NCID
AN10506284
資料タイプ
紀要論文
OAI-PMH Set
岡山大学
言語
English
著作権者
© 2018 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
論文のバージョン
publisher
Eprints Journal Name
esr