Estimation of sedimentation ages by AMS radiocarbon dating of bored cores from Togokusan marsh, Nagoya, Aichi Prefecture, central Japan

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  • 名古屋市守山区東谷山湿地のボーリングコア試料のAMS14C年代と堆積年代
  • ナゴヤシ モリヤマク トウゴクサン シッチ ノ ボーリングコア シリョウ ノ AMS ¹⁴ C ネンダイ ト タイセキ ネンダイ

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Abstract

Two sediment columns of about 250 cm long were bored at Togokusan marsh, Moriyama, Nagoya, Aichi Prefecture, Japan. The object of collecting sediment columns was to study temporal development of wetland environment at Togokusan march area. To obtain the sedimentation age of the columns, 18 samples of plant residues and bulk soil materials were collected. Radiocarbon ages of 13 samples measured by using AMS 14C system at Nagoya University were calibrated to calendar dates. Calendar dates covered from 411 cal BC to cal AD 422 for the samples at the core-depths from 850 to 2289 mm. According to the careful examination of facies along the obtained sediment column, the lower sediments (850-2289 mm) did not deposit under wetland environment, but deposited under stream environment. This chronological study suggests that the Togokusan march started to be wetland environment at around early period of first millennium AD.

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