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ID 25769
本文ファイル
別タイトル
K-Ar whole-rock ages of low-grade metamorphic rocks in Chugoku, Southwest Japan
著者
河本 直実
鈴木 峰央
NDC
地球科学・地学・地質学
抄録(英)
K-Ar whole-rock ages are obtained from the low-grade metamorphic rocks of the Misumi Group, the Jurassic Chizu Formation, the Jurassic Tsunotani Formation and the Permian Maizuru Group. The low-grade metamorphic rocks are distributed adjacent to the high P/T Sangun metamorphic rocks in the Chugoku district. There are quite differences in small-scale structures between the low-grade metamorphic rocks and the Sangun metamorphic rocks. In the low-grade metamorphic rocks, two generations of penetrative foliation and associated structures can be recognized: slaty cleavage and crenulation cleavage. On the other hand, three generations of foliation are developed in the Sangun metamorphic rocks: schistosity and two stages of crenulation cleavage. Obtained K-Ar whole-rock ages are nearly 170-190 Ma. This indicates that slaty cleavage in the low-grade metamorphic rocks have been formed in Middle Jurassic time, and that the Sangun memtamorphic rock has been formed before 170-190 Ma.
掲載誌名
広島大学大学院総合科学研究科紀要. II, 環境科学研究
2巻
開始ページ
11
終了ページ
18
出版年月日
2007-12-31
出版者
広島大学大学院総合科学研究科
ISSN
1881-7696
NCID
SelfDOI
言語
日本語
NII資源タイプ
紀要論文
広大資料タイプ
学内刊行物(紀要等)
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2006 by Graduate School of Integrated Arts and Sciences, Hiroshima University. All rights reserved
部局名
総合科学研究科
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