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Highly precise AMS radiocarbon dating of woods buried by the 10th century eruption of Baitoushan volcano(Proceedings of the 15^<th> Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2002)

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  • 白頭山火山の10世紀における巨大噴火の高精度 AMS^<14>C年代測定(第15回名古屋大学タンデトロン加速器質量分析計シンポジウム(平成14(2002)年度)報告)

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Abstract

The eruption age can be determined by radiocarbon dating of wood samples that had been blighted by the volcanic eruption. The wood samples were collected from the sediment layers of the pyroclastic flow or mudflow deposits that were produced by the 10th century eruption of Baitoushan in China. The ash is referred to as the B-Tm (Baitoushan-Tomakomai) tephra, which is often found at the archaeological excavation sites in northern Japan. However, the precise age of the eruption has not been determined yet. A sample with 102 annual rings and barks was divided year by year. 35 annual rings out of the divided ones were selected for ^<14>C dating. This amounts to a selection of annual rings of almost every 3 years. The ^<14>C ages were obtained by using AMS. The ^<14>C ages were calibrated to calendar year by wiggle matching. The calibrated age of the outermost annual ring was 936^<+8>_<-6> cal AD. The eruption age obtained in this study is consistent with the results by other researches.

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