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ID 13927
Eprint ID
13927
フルテキストURL
Thumnail ESR_3_1.pdf 753 KB
著者
Daniel K. Asiedu Department of Earth Sciences, Faculty of Science, Okayama University
鈴木 茂之 Department of Earth Sciences, Faculty of Science, Okayama University
柴田 次夫 Department of Earth Sciences, Faculty of Science, Okayama University
抄録
Petrographic and geochemical study of sandstones from the Kenseki Formation have shown that the sandstones are compositionally immature. The immaturity is reflected geochemically by their low SiO2 contents (52-66 wt%) and petrographically by low modal percents of quartz and K-feldspar, and high modal percents of plagioclase and volcanic lithic fragmants. The Kensaki sandstones are, however, poor in Na2O (up to 2.1 wt%). Both petrography and geochemistry suggest a heterogeneous source lithologies of acidic and basic volcanics, sedimentary, and ultramafic rocks. Petrographic evidence is supplied by quartz and plagioclase of volcanic origin, acidic volcanic fragments, basic volcanic fragments, volcanic glass, serpentinite fragments and detrital spinel grains. Geochemical evidence is provided by high FeO* (total iron as FeO), MgO, TiO2, CaO and K2O contents. Petrographic and geochemical study of the Kenseki sandstones indicate calc-alkaline oceanic island are provenance. The sediments were locally derived, with Alpine-type ultramafic rocks exposed in the north and volcanic materials of the Akiyoshi Belt supplying the bulk of the detritus.
キーワード
Kenseki Formation
modal analyses
provenance
発行日
1996-09-20
出版物タイトル
Okayama University Earth Science Report
出版物タイトル(別表記)
岡山大学地球科学研究報告
3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
1
終了ページ
16
ISSN
1340-7414
NCID
AN10506284
資料タイプ
紀要論文
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
Eprints Journal Name
esr