Varved lacustrine sediments of lake tougou-ike, western japan with reference to holocene sea-level changes in japan
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概要
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Holocene laminated sequence consisting of alternations of light- and dark-colored laminae was recognized in the sediment core taken from Lake Tougou-ike in 1992 by our research group. Biochemical and mineral compositions. micro-sedimentary structures and AMS ^＜14＞C dating of organic remains in this laminated sequence support the laminated sediments are identified as non-glacial varves, which were formed mainly by seasonal changes of diatom productivities. Varve counting and ^＜14＞C dating provided Holocene detailed chronology, from annual to decadal for reconstructing paleoenvironments from the sediment core with high time resolution. Based on this chronology Holocene relative sea-level changes at Lake Tougou-ike were estimated from authogenic iron mineral contents of the sediments. The relative sea-level changes show abrupt rises at about 8,900, 7,700, 5,600, 4,000, 3,600 and 2,700 calendar years BP. with gradual falling between the interval periods. These relative sea-level changes are suggested
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