A prompt report for the KS0412-3 core collected from Kashinokibaru Marsh in northern Kyushu, SW Japan(Summaries of Researches Using AMS)

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  • 北部九州の樫原湿原におけるボーリング・コア試料 (KS0412-3)の分析結果(速報)(タンデトロン加速器質量分析計業績報告2004(平成16)年度)

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The Kashinokibaru Marsh is located on western part of Sefuri Mountains in northern Kyushu, Japan. In order to reveal the origin of the marsh, we collected the three cores (KS-0412-1, 2 and 3) in December, 2004. This paper presents preliminary results (i.e., physical properties of sediments, pollen and phytolith assemblages and radiocarbon date) of the KS-0412-3 core. We obtained three radiocarbon dates for plant fragments. The sedimentation rate of the marsh deposits is estimated to be 4.1 mm/yr. This rate implies that the marsh deposits have been accumulated since approximately 1200 cal AD. The pollen and phytolith analyses indicate that rice field was buried by medium to coarse sand layer at 1400 cal AD, since then the marsh has been sustained. This result is consistent with insect and diatom assemblages in the 0304 core (Okuno et al., 2004).

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