Title Transcription | Geochemical implication for the maximum flooding of the Jomon transgression in the coastal lagoon sediments, San'in district, SW Japan
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Title Alternative (English) | Geochemical implication for the maximum flooding of the Jomon transgression in the coastal lagoon sediments, San'in distdct, SW Japan
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File | |
language |
eng
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Author |
Ishiga, Hiroaki
Interdisciplinary Faculty of Science and Engineering, Department of Geoscience, Shimane University
Sampei, Yoshikazu
Interdisciplinary Faculty of Science and Engineering, Department of Geoscience, Shimane University
Tokuoka, Takao
Interdisciplinary Faculty of Science and Engineering, Department of Geoscience, Shimane University
Takayasu, Katsumi
Research Center for Coastal Lagoon Environments, Shimane University
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Description | The Holocene Jomon transgression was recorded in sediments at the archeological site in the Shimane University,which were deposited in the most inner part of the lagoon.Marine mud deposition in back marsh condition indicates start of the transgression,which is marked by the Kikai-Akahoya tephra of 6300 yrs BP.
Marine muds are characterized by fluctuating values of LOI(loss on ignition),total sulfur contents(TS),and Fe_2O_3 / Al_2O_3 ratios and these values are relatively higher than those of the non-marine ones in this section.Rb/K also shows fluctuation indicating Rb enrichment in under marine condition,probably related to Rb adsorption on clays.These sediments of this section show higher CIA(80~85)suggesting derivation of highly weathered material from the source or sorting of the clays.Ti/Zr shows gradual increase in the Jomon age,suggesting heavy mineral fractionation related to the transgression. High stand in sea-level probably lasted until middle Jomon age(4500 yrs BP),and consequently effects of fluvial inputs were dominated due to lowered sea-level.Gradual decrease in Al_2O_3 / TiO_2,SiO_2 / Al_2O_3 and Ti/Zr,and increase in Nb/Y and Zr/Y may be related to the source compositional changes due to the widening of the paddy field in the Yayoi age from 2400 yrs BP. |
Journal Title |
島根大学地球資源環境学研究報告
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Volume | 17
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Start Page | 11
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End Page | 20
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ISSN | 13439774
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Published Date | 1998-12-25
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NCID | AA11455176
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DOI(SelfDOI) | |
Publisher | 島根大学総合理工学部地球資源環境学教室
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Publisher Aalternative | Department of Geoscience, Interdisciplinary Faculty of Science and Engineering, Shimane University
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NII Type |
Departmental Bulletin Paper
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Format |
PDF
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Text Version |
出版社版
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OAI-PMH Set |
Interdisciplinary Graduate School of Science and Engineering
Estuary Research Center
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Remark | 12-14,16+ / 1993+
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他の一覧 |