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language
eng
Author
Barry, Roser
Ueda, Hayato
Kawamura, Makoto
Description
The Carboniferous-Jurassic Oshima Belt is a Jurassic accretionary complex exposed in the Oshima Peninsula of SW Hokkaido.This report contains whole-rock X-ray fluorescence analyses of 82 turbidite sandstones and mudrocks collected from terrigenous units in the Ohkamotsugawa,Esashi,Kamiiso,and Toi Complexes,which crop out from west to east.
The results show the Oshima sandstones are comparatively silica-rich(generally 73-85 wt% SiO_2),and are depleted in CaO,Na_2O,Sr,and ferromagnesian elements(MgO,Fe_2O_3T,Sc,Ni,Cr and V)relative to average upper continental crust.Sandstones and mudrocks form linear trends on oxide/element-Al_2O_3 variation diagrams,typical of sorting fractionation.SiO_2,Na_2O,and to a lesser extent CaO and Sr decrease in abundance as Al_2O_3 increases from sandstone to mudstone,whereas all other elements analyzed except MnO,Sr,and Zr increase in abundance.Elemental abundances in Ohkamotsugawa,Esashi,and Kamiiso sandstones are broadly compatible with derivation from a felsic source.Enrichment of ferromagnesian elements(Fe,Mg,Sc,Ni,Cr,V)in some Toi Complex sandstones are suggestive of a minor mafic to intermediate volcaniclastic component,lending support to the proposed bidirectional source for that unit.
Journal Title
島根大学地球資源環境学研究報告
Volume
22
Start Page
93
End Page
105
ISSN
13439774
Published Date
2003-12-27
NCID
AA11455176
Publisher
島根大学総合理工学部地球資源環境学教室
Publisher Aalternative
Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
NII Type
Departmental Bulletin Paper
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
Remark
12-14,16+ / 1993+
飯泉滋教授・山内靖喜教授 退官記念特集号
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