徳島平野と濃尾平野で得られた完新世浅海底堆積物のテフラと放射性炭素年代による編年(＜特集＞火山噴火史解明のための露頭データベース構築の検討(3))

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  • Chronology of the Holocene Shallow Marine Sediments under the Tokushima and Nobi Plains, Central Japan by Tephras and Radiocarbon Dates(＜Special Section＞Determination of the Construction of an Outcrop Database to Reveal Eruptive History (3))
  • 徳島平野と濃尾平野で得られた完新世浅海底堆積物のテフラと放射性炭素年代による編年
  • トクシマ ヘイヤ ト ノウビ ヘイヤ デ エラレタ カンシン セイセンカイテイ タイセキブツ ノ テフラ ト ホウシャセイ タンソ ネンダイ ニ ヨル ヘンネン

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Analysis of volcanic glass and radiocarbon dating were applied to shallow marine sediment of 6 cores obtained from the Tokushima and Nobi plains, central Japan. Six basal horizons of Kikai-Akahoya (K-Ah) ash and two ones of Amagi-Kawagodaira (Kg) ash were identified from these cores based on the contents of volcanic glass, morphology of glass shards and these colors. The known ages of these tephras, K-Ah: 7165-7303 cal BP and Kg: 3137-3160 cal BP, were compared with the radiocarbon ages measured around these horizons. Seven pairs of radiocarbon ages from plants and shells were consistent with the tephra eruption ages. However, other 1 pair was 500-1000 years older than the age of tephra because the age was obtained from organic sediment. Integrated chronology by tephras and radiocarbon dating will enable to determine us high-resolution interpretation of shallow marine sediments.

収録刊行物

  • 火山

    火山 60 (3), 299-308, 2015

    特定非営利活動法人 日本火山学会

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