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ID 19850
JaLCDOI
Sort Key
5
タイトル(別表記)
岡山県に分布する白亜紀前期羽山層砕屑物質の供給源:砕屑粒の鉱物化学組成とモード組成から導かれる制約
フルテキストURL
著者
アシード ダニエル Department of Earth Science, University of Ghana
鈴木 茂之 岡山大学
柴田 次夫 岡山大学
抄録
Petrographic and phase chemistry studies of detrital grains were carried out on sandstones from the Lower Cretaceous Hayama Formation, Inner Zone of Southwest Japan, to determine their provenance and the tectonic setting during the early Cretaceous. The results of the modal mineralogy suggest that the Hayama Formation has magmatic arc provenance and that deposition of the sediments took place in the back-arc areas with detritus mostly derived from the magmatic arc and rifted continental margins. The chemical compositions of chromian spinel, chlorite and sphene indicate that significant proportions of the detrital grains were derived from mafic and/or ultramafic sources. The source areas are the mafic and ophiolitic rocks in the Sangun-Renge and Akiyoshi terranes and the felsic volcanic rocks probably from either the Akiyoshi terrane or a source not presently exposed in southwest Japan. However, minor amounts of the detritus were derived from the basement rocks; i.e., carbonates and siliciclastic rocks of the Akiyoshi terrane and the metamorphosed mafic rocks of the Chizu terrane.
キーワード
modal analysis
sandstone
mineral chemistry
provenance
Hayama Formation
出版物タイトル
Okayama University Earth Science Report
発行日
2009-12-25
16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
29
終了ページ
42
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
岡山大学地球科学研究報告編集委員会
論文のバージョン
publisher
査読
無し
NAID
Eprints Journal Name
esr