<sup>14</sup>C ages for the ejecta from Kutcharo and Mashu calderas, eastern Hokkaido, Japan

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  • 北海道東部，屈斜路・摩周カルデラ噴出物の放射炭素年代値
  • ホッカイドウ トウブ クッシャロ マシュウ カルデラ フンシュツブツ ノ ホウシャ タンソ ネンダイチ
  • 14C ages for the ejecta from Kutcharo and Mashu calderas, eastern Hokkaido, Japan

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Abstract

    Eruption ages of the ejecta from Kutcharo and Mashu calderas were systematically determined by 14C dating. 16 charred samples were newly obtained from the Mashu and Nakashumbetsu Tephra Formations around the calderas and dated by AMS and β-counting methods. Examined units are Ma-d, Ma-e, Ma-f, Ma-j, Ma-k, Ma-l and Ml-a in the Mashu ejecta and 6 Nakashumbetsu tephra layers including Kutcharo Pumice Flow Deposit I (KpI), which is the youngest caldera-forming product from Kutcharo caldera. Results of the 14C dating range from 3,660 ±40 yBP to 36,080±1,300 yBP, and are consistent with the tephrostratigraphy. Calendar age for KpI was newly calculated at almost 40 ka and this age shows there was about 70,000 years recurrence interval between KpI and KpIV caldera-forming eruptions. Mashu caldera has appeared on the eastern part of Kutcharo caldera immediately after the KpI eruption, and calendar age for its main caldera-forming eruption were determined at ca. BC 5,600.

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