AMS ^<14>C chronology and the marine reservoir effect for human bones from the Ohtomo site(Proceedings of the 15^<th> Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2002)

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  • 佐賀県大友遺跡出土人骨のAMS^<14>C年代測定と海洋リザーバー効果(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

^<14>C ages for Japanese prehistoric samples from the Latest Jomon period to the early Yayoi period, have a calibration ambiguity for dates around 2400 BR. It is also necessary to correct for the marine reservoir effect on ^<14>C ages of human bone samples from people who consumed marine food as a protein source. The Ohtomo site in Saga Prefecture, northwest Kyushu, western Japan, is a cemetery site dating from the end of Latest Jomon period to the Kofun period. Human bones are found in dolmen burials (from the 4th century BC to the 1st century BC), jar burials (from the 1st century BC to the 1st century AD) and cist burials (from the 1st century AD to the 3rd century AD), and provide an archaeological chronology. In this study, we determined the ^<14>C ages of human bone samples and compare them with the archaeological chronology. The Ohtomo site faces the Japan Sea, consequently, people seem to utilize many marine food sources. To get information about marine food sources, we also tried diet analysis based on δ^<13>C and δ^<15>N in human bones. Diet analysis showed that these people obtained from 40% to 60% of their protein from marine food sources. Marine reservoir effects were calibrated using the data "400 years" and percentages of dependence to marine food resources from δ^<13>C and δ^<15>N, and 14C ages were corrected to calendar year by CALIB 4.3. The calibrated ^<14>C ages of the human bones were serially matched with the archaeological chronology.

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