北海道礼文島久種湖における完新世堆積物中の珪藻遺骸群集の遷移

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  • Holocene Sedimentary History of Kushu Lake in Hokkaido, Japan

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Diatom assemblages of sediments obtained from Kushu Lake were analyzed to clarify the local Holocene sedimentary history. The results are summarized in the following : 1) Before about 9000 y.B.P., Kushu Lake was originally a freshwater environment. 2) The first marine diatom zone (MD1 zone) was deposited on the bottom of the paleo-Kushu Bay between 8500 and 6000 y.B.P. 3) This site changed to the bottom of the paleo-Kushu Lagoon around 6000 y.B.P., as the result of the formation of a bay-mouth bar across the paleo- Kushu Bay. 4) The first Holocene regression resulted in a freshwater lake at about 4500 y.B.P. 5) The occurrence of "Mastogloia elliptica" between 7000 and 5000 y.B.P. suggested the influx of the Tsushima warm current into the Japan Sea.

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