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Major and trace element compositions of Cretaceous-Paleocene sandstones and mudrocks from the Idonnapu Zone and the Yezo Supergroup, Urakawa, Hokkaido
日本語以外のタイトル
Major and trace element compositions of Cretaceous-Paleocene sandstones and mudrocks from the Idonnapu Zone and the Yezo Supergroup, Urakawa, Hokkaido
ファイル
言語
日本語
著者
Roser BarryPaul
植田 勇人
前原 恒佑
内容記述(抄録等)
The Idonnappu Zone,a Cretaceous-Paleocene accretionary complex,occurs between the Hidaka and Sorachi-Yezo Belts in central Hokkaido.This report contains whole-rock X-ray fluorescence analyses of 75 Cretaceous-Paleocene sandstones and mudrocks from the accretionary complex Idonnappu Zone and the Yezo Supergroup forearc sequence in the Urakawa district,southern central Hokkaido.The Idonnappu Zone suite comprises 45 samples from the MN-Unit of the Naizawa Complex and the PT-,MH- and T-Units of the Horobetsugawa Complex.The remaining 30 samples are evenly divided between the Upper and Lower Yezo Groups.The suites generally exhibit linear or curvilinear trends on oxide- or element-Al_2O_3 variation diagrams,typical of sorting fractionation.Elemental abundances and trends in the three suites generally overlap,suggestive of a common source.However,contrasts in abundances for some elements between suites,and trends in Basicity Index and K_2O/Na_2O ratios suggest some change in provenance over time,with shift from a mature or dissected arc source in the Early Cretaceous to a more primitive(but still relatively evolved)arc source in the Late Cretaceous and Paleocene.This change is recorded in both the accretionary complex and the forearc sequence.
掲載誌名
島根大学地球資源環境学研究報告
18
開始ページ
11
終了ページ
24
ISSN
13439774
発行日
1999-12-25
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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