Whole-rock geochemical compositions of Miocene sedimentary and volcanic rocks from the lzumo-Matsue districts and shimane Peninsu1a,SW Japan

島根大学地球資源環境学研究報告 Volume 20 Page 69-82 published_at 2001-12-28
アクセス数 : 1217
ダウンロード数 : 96

今月のアクセス数 : 0
今月のダウンロード数 : 0
File
c006020010.pdf 2.6 MB エンバーゴ : 2007-01-17
Title
Whole-rock geochemical compositions of Miocene sedimentary and volcanic rocks from the lzumo-Matsue districts and shimane Peninsu1a,SW Japan
Creator
Tateishi Yoko
Nakayama Katsuhiro
Source Title
島根大学地球資源環境学研究報告
Volume 20
Start Page 69
End Page 82
Journal Identifire
ISSN 13439774
Descriptions
Miocene backarc clastic sediments crop out in a strip along coastal Shimane prefecture between Izumo and Matsue,and in Shimane Peninsula.New XRF analyses of 147 sandstones,mudrocks and associated volcanic rocks from the Koura,Ushikiri,Omori,Fujina,Jinzai and Matsue Formations show considerable compositional variation occurs over relatively short stratigraphic intervals.Koura Formation sandstones have Upper Continental Crust(UCC)-normalized multielement patterns intemediate between interbedded felsic tuff and coeval andesite.Turbidite sedimentsfrom the Ushikiri Formation at Chikumi also have andesitic patterns,but shallow water equivalents in the Omori Formation near Izumo exhibit dacitic signatures identical to the volcanic rocks on which they rest.Elemental abundances in the overlying Fujina Formation are depleted relative to UCC,suggesting influx of weathered plutonic detritus.Similar signatures occur in the Jinzai Formation,except for localized basaltic contributions around the Jinzai Basalt edifice.Sediments of the Matsue Formation,which is correlative with the Jinzai Formation,also have depleted patterns indicative of plutonic source,but carry signatures suggestive of more intense source weathering and more advanced sorting in a shallower water depositional environmen.The stratigraphic and lateral variations observed reflect relatively proximal deposition,complex source geology,and sediment supply from restricted catchments.
Language
eng
Resource Type departmental bulletin paper
Publisher
島根大学総合理工学部地球資源環境学教室
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
Date of Issued 2001-12-28
Publish Type Version of Record
Access Rights open access
Relation
[NCID] AA11455176
Remark 12-14,16+ / 1993+