ダウンロード数 : ?
タイトルヨミ
タイワン オヨビ ニホン レットウ ノ コダイサンケイ オヨビ シンダイサンケイ ノ タイセキガン ノ Th Sc オヨビ キドルイ ゲンソ ソセイ
タイトル別表記
Th,Sc and rare earth element concentrations ofthe Paleogene and Neogene sedimentary rocks of Taiwan and Japanese lslands
ファイル
言語
日本語
著者
山崎静子
道前 香緒里
内容記述(抄録等)
Th,Sc and rare earth element concentrations have been examined mainly from Paleogene and Miocene sedimentary rocks of Taiwan and of the Japanese islands.Examined sedimentary sequences are widely located in the Taipei region of Taiwan,Yuya and Susa(Yamaguchi Prefecture),Masuda and Matsue(Shimane Prefecture),Shobara(Hiroshima),Ujidawara(Kyoto Prefecture)of southwest Japan,and Boso(Chiba Prefecture)of Kanto region of Japan.
In Taiwan,the values of Eu/Eu* for the Paleogene and Miocene samples excluding the lowermost sample are consistently around O.6 suggesting evolved continental provenance,very close to those of the present upper continental crust(UC)[Eu/Eu*=0.59].Th/Sc ratios(1.3)show relatively higher values than that of UC,probably due to sorting effect of sedimentary process.The samples from inland basins of southwest Japan(Shobara and Ujidawara)have the composition similar to UC with some variation.Samples of the Yuya,Susa,Masuda,Matsue and Boso areas show stratigraphic variation from primitive to more evolved due to provenance changes related to Japan Sea opening.
The mixing model of UC,basalt(Ba)and granite(Gr)is inferred for provenance signature for these sedimenraty rocks along with previous results.The models revealed provenance variation of the Miocene of Japan sea side from primitive nature(UC:Ba:Gr=60:38:2)of Tohoku region of northeast Japan to more evolved(UC:Ba:Gr=60:2:38)Kyushu region via Chugoku region of southwest Japan.Samples of Taiwan,Kyushu and Yuya form the trend from evolved to more primitive,but lying above the compositional trend of the mixing model probably due to enrichment in Th related to sedimentation on the evolved continental crust.
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
55
終了ページ
67
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+