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ファイル
言語
英語
著者
Roser BarryPaul
藤井 理恵
橋本 真治
内容記述(抄録等)
Major and trace element analyses of mainly sedimentary rocks from the Kawai-Kuri,Omoh,Ushikiri,and Fujina Formations were made to add to a growing database for Miocene backarc sediments in Shimane,SW Japan.Samples were collected in the Shinji-Matsue district and in Shimane Peninsula.Kawai-Kuri sandstones and mudrocks are silica-rich,and most elements are depleted relative to Upper Continental Crust(UCC),suggesting derivation from a felsic granitoid source.Overlying Omori Formation volcanogenic sandstones have considerably lower SiO_2 contents and abundances of other elements lie closer to UCC,reflecting derivation from coeval Omori andesites and dacites.Deeper water turbiditic sediments in the correlative Ushikiri Formation have almost identical compositions.Mudrocks and very fine-grained sandstones from the Fujina Formation are moderately SiO_2-rich,and have elemental abundances similar to or less than UCC.This and immobile element ratios imply a mixed source comprising felsic granitoids and subordinate Omori volcanic and sedimentary rocks.The succession thus records initial exposure and erosion of basement granitoids,superimposed volcanism,and subsequent stripping of the volcanic cover.
掲載誌名
島根大学地球資源環境学研究報告
23
開始ページ
39
終了ページ
48
ISSN
13439774
発行日
2004-12-27
NCID
AA11455176
出版者
島根大学総合理工学部地球資源環境学教室
出版者別表記
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
資料タイプ
紀要論文
部局
(旧組織)大学院総合理工学研究科
備考
12-14,16+ / 1993+
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