Relative sea-level change during 6,300-2,000BC reconstructed from drilling cores from Ito City, eastern coast of the Izu Peninsula, central Japan

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  • 静岡県伊東市のボーリングコアから復元した6,300〜2,000BCの相対的海水準変動
  • シズオカケン イトウシ ノ ボーリングコア カラ フクゲン シタ 6,300~2,000BC ノ ソウタイテキカイ スイジュン ヘンドウ
  • 書評 菊池敏夫著 『民国期上海の百貨店と都市文化』
  • ショヒョウ キクチ トシオ チョ 『 ミンコクキ シャンハイ ノ ヒャッカテン ト トシ ブンカ 』

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Abstract

This paper discusses relative sea-level (RSL) changes from 6,300BC to 2,000BC for the coast of Ito City, on the northeastern Izu Peninsula, central Japan. RSL along this coast was evaluated by synthesizing a depositional curve suggesting the former sea floor height and paleo-water depth obtained from drilling cores. The depositional curve was reconstructed for two cores, IT-1 (30m deep) and IT-2 (10m deep), using a total of 37AMS 14C ages. Paleo-water depth was estimated from the analyses of sedimentary facies and fossil ostracode and molluscan assemblages in cores IT-1 and IT-2. Existing core logging data (a total of 23 cores) and 14C ages obtained in Ito City helped the analyses of sedimentary facies. A total of six water depth control points were obtained from these data. The reconstructed RSL curve suggests that the paleo-mean sea level rose from 〜−16m ca. 6,300BC to 〜−13m ca. 5,900BC and reached the maximum of +3〜4m ca. 4,800BC. The paleo-mean sea level positions were +1.5m around 4,600BC, +1m around 2,900BC, and 〜0 (zero) m around 2,000BC. Estimated RSL rise value between 6,300BC and 4,800BC was 10m or more, larger than that for the areas without large vertical crustal movement. This discrepancy may reflect local subsidence in the Ito area.

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