北部九州,樫原湿原のボーリング・コアの層序と ^<14>C年代(タンデトロン加速器質量分析計業績報告2003(平成15)年度)

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  • Stratigraphy and ^<14>C ages of cored samples from Kashibaru Marsh in northern Kyushu, Japan(Summaries of Researches Using AMS)

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The Kashibaru Marsh is located on Sefuri Mountains in northern Kyushu, Japan. In order to reveal the origin of the marsh, we collected the cored samples from 100 cm to 425 cm below surface, using peat sampler. This paper presents here results of ^<14>C dating, deposit density and carbon and nitrogen contents of the drilling core. We picked up the peaty deposit from two horizons (222 cm and 442 cm below surface), and then separated two fractions (i.e. plant residue and total organic carbon). Totally we obtained four ^<14>C ages, and recognized systematic gap between two fractions. The calibrated age at 442 cm below surface is about 800 cal BP (cal AD 1150). This age shows that the marsh is probably caused by human activity.

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