Systematic Age Gap of Radiocarbon Dates between Organic Bulk Sediment Samples and Fossil Samples of Animal and Plant in Holocene Core Sediments and Their Causes

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  • 完新統コア中の有機質堆積物 (バルク) 試料と生物化石試料間に認められる放射性炭素年代値の系統的な差とその要因
  • カンシントウコア チュウ ノ ユウキシツ タイセキブツ(バルク)シリョウ ト セイブツ カセキ シリョウ カン ニ ミトメラレル ホウシャセイ タンソ ネンダイチ ノ ケイトウテキ ナ サ ト ソノ ヨウイン

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Abstract

 Rradiocarbon dates of organic bulk sediment samples, as well as animal and plant fossil samples, from Holocene coastal lowland sediments are compared to clarify characteristic differences between the dates of both samples and estimate the true age of sedimentation. The samples were collected from drilled cores obtained from two sites. An OSN-Br core was drilled at a river mouth in Kuji City, Iwate Prefecture, and consisted of marine sediments showing sea-level rise during the Holocene. Two KYD-Br cores were drilled at a small valley in Yamada Town, Iwate Prefecture, and consisted of peaty sediment and interbedded event deposits (e.g., tephra and tsunami deposits). Based on a comparison with the dates of samples collected from the same horizon or ages of tephras, radiocarbon dates of organic bulk sediment samples of the OSN-Br core showed a systematic age difference between the dates of animal and plant fossil samples and tephras. These organic bulk sediment samples were interpreted to include old carbon derived from the hinterland, particularly from Paleogene to Cretaceous sedimentary rocks. On the other hand, radiocarbon dates of organic bulk sediment samples of the KYD-Br cores agree with dates of in-situ plant fossil samples (seed and leaf) and are consistent with the age of tephras. Therefore, it can be assumed that the dates of organic bulk sediment samples represent the true age of sedimentation.

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