Reconstruction of Depositional Environment and Paleoclimate Changes from a Small Basin Deposit during the Past 300,000 Years, Central Japan

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  • 東濃地方内陸小盆地埋積物の分析による過去３０万年間の古気候変動
  • トウノウ チホウ ナイリク ショウボンチ マイセキブツ ノ ブンセキ ニ ヨル カコ 30マンネンカン ノ コ キコウ ヘンドウ

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Abstract

In order to reconstruct the depositional environment and paleoclimate changes since the middle Pleistocene in central Japan, tephra analysis, pollen analysis, magnetic susceptibility measurement, grain size analysis and color index measurement were conducted for a 25.3m-long sediment core obtained from Okute basin in central Japan.<br>The sediment consists of mainly fine materials characterized by periodic alternation of peat layers and inorganic clay layers for the past 300ka. Paleo-temperature were quantitatively reconstructed from the pollen profile using standard modern analog technique. The curve showed a fluctuation pattern remarkably similar to that of the deep sea δ18O record. Mean annual temperature was 3 to 4°C in the full-glacial period and 12 to 13°C in the full-interglacial period. The difference between full-glacial and full-interglacial is 10°C.<br>Color measurement enables us to discriminate peat layer/humic silt layer and inorganic silt layer using an L* value that describes lightness. This boundary value is 30. L* value variations were closely connected to the June insolation variations at 30N that are depended on the precession. The beginning of peat deposition corresponds to the timing of insolation values over 500W/m2.<br>As observed above, global climatic changes and regional environment changes have been continuously recorded in this core for the past 300ka.

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