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Biogenic Silica Record in Lake Biwa of Central Japan over the Past 145,000 Years

Published online by Cambridge University Press:  20 January 2017

Jule Xiao
Affiliation:
Institute of Geology, Chinese Academy of Sciences, Beijing, 100029, China
Yoshio Inouchi
Affiliation:
Department of Marine Geology, Geological Survey of Japan, Tsukuba, 305, Japan
Hisao Kumai
Affiliation:
Department of Geosciences, Faculty of Science, Osaka City University, Osaka, 558, Japan
Shusaku Yoshikawa
Affiliation:
Department of Geosciences, Faculty of Science, Osaka City University, Osaka, 558, Japan
Yoichi Kondo
Affiliation:
Nojiriko Museum, Shinano-machi, 389-13, Japan
Tungsheng Liu
Affiliation:
Institute of Geology, Chinese Academy of Sciences, Beijing, 100029, China
Zhisheng An
Affiliation:
Xi'an Laboratory of Loess and Quaternary Geology, Chinese Academy of Sciences, Xi'an, 710054, China

Abstract

The record of the biogenic silica flux (BSF, g cm−2(103yr)−1) in Lake Biwa reflects changes in diatom productivity in the lake and provides information regarding changes in paleoclimatic conditions. The BSF record of Lake Biwa demonstrates five periods over the past ca. 145,000 yr when the BSF values were significantly greater than 7.5 g cm−2(103yr)−1, and five intervals when they were lower. The data imply that paleoclimatic conditions were warmer and wetter from ca. 123,000 to 115,000, 103,000 to 95,000, 88,000 to 72,000, 57,000 to 32,000 yr B.P., and around ca. 6000 yr B.P. when the BSF values were greater, and relatively dry and cold from ca. 141,000 to 123,000 yr B.P. and during intervals between two of the five warm and wet episodes when the BSF values were lower. Time series of the BSF record can be correlated with the record of biogenic silica content in Lake Baikal and the marine oxygen isotope stages 1 through 6. Furthermore, the BSF values varied with much higher amplitude during the last interglaciation than during the last glaciation, probably implying that the diatom productivity in Lake Biwa was likewise more variable and had a larger range under interglacial conditions than under glacial conditions.

Type
Original Articles
Copyright
University of Washington

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