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ID 20655
file
creator
Akagawa, Fuminori
Koshi, Yamamoto
Tani, Yukinori
Kawabe, Iwao
Kawai, Takayoshi
NDC
Earth sciences. Geology
abstract
Sediments deposited on the bottom of Lake Baikal have contributed to the understanding of a long-term environmental history of continents. Rare earth elements (REEs) along with major elements and loss on ignition (LOI) of Baikal sediments were determined with the aim of evaluating their suitability for a new paleoenvironmental proxy. Our interest is concentrated on paleoenvironmental change during the Last Glacial/Interglacial Transition (LGIT). Chondrite-normalized REE patterns for Baikal sediments show a similar variation to those for typical upper continental crustal materials. Three parameters of (La/Yb)n (n: chondrite-normalized value) ratio, ΣREE/TiO2 and Eu anomaly were used to express detailed characteristics of Baikal sediments. Depth profile of (La/Yb)n ratio shows abrupt change, whose timing corresponds to the beginning of climatic warming inferred from the profiles of SiO2/TiO2 and LOI. In addition, (La/Yb)n ratio, ΣREE/TiO2 and the degree of Eu anomaly correlate with each other. This suggests that inflow process of particulate materials into the lake may have changed during the Last Glacial/Interglacial Transition. The analytical results of this study lead to the conclusion that REE are a useful paleoenvironmental proxy in the Baikal region.
journal title
Quaternary Science Reviews
volume
Volume 26
issue
Issue 9-10
start page
1362
end page
1368
date of issued
2007-05
publisher
Pergamon-Elsevier Science Ltd.
issn
0277-3791
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2007 Elsevier Ltd
relation url
department
Graduate School of Science