Sea-level and palaeoenvironmental changes of Kokubu plain on the northern coast of Kagoshima Bay, south Japan, since 15,000 years ago

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  • 鹿児島湾北岸，国分平野における過去15,000年間の海面変化と古環境変化
  • カゴシマワン ホクガン,コクブ ヘイヤ ニ オケル カコ 15,000ネンカン ノ カイメン ヘンカ ト コ カンキョウ ヘンカ
  • Sea-level and paleoenviromental changes of Kokubu plain on the northern coast of Kagoshima Bay, South Japan, since 15,000 years ago
  • Sea-level and paleoenvironmentala changes of Kokubu plain on the northern coast of Kagoshima By, south Japan, since 15,000 years ago

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Kokubu plain is suitable for obtaining the records of sea levels and palaeoenvironments since the last deglaciation, because thick coastal deposits since this stage occur in the region. We examined changes in sea level and palaeoenvi-ronments over the past 15,000 years on the basis of palaeoenvironmental records of sedimentary facies, shells, foraminifers and diatoms, and chronological data of tephras and 14C dates in three cores obtained on Kokobu plain.<BR>The results are as follows. Kagoshima Bay was a lake with a level c. 90m below the present sea level in the Last Glacial Maximum. Sea level was 85〜90m below the present sea level and the sea attained the head of the bay at c. 14,500 calBP. Subsequent rapid sea-level rise occurred in two stages at c. 14,500〜13,000calBP and 11,500〜7,500calBP. A shallow sea or tidal flat was maintained in the present coastal area even during the course of rapid sea-level rise in the last deglaciation. The head of the bay was not closed by the growth of Sakurajima volcano at the southern rim of Aira caldera. These changes in sea level and palaeoenvironments are precisely correlated with marine oxygen isotope records using Sakurajima Satsuma tephra (ca. 12,800 calBP).

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