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尾張地域の弥生時代・古墳時代の土器に付着した炭化物の放射性炭素年代(第16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15(2003)年度報告)

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Abstract

Chronology of the pottery groups excavated from a local area has been established by a typological analysis, by comparing shapes and surface decorations of pottery. However, the typological analysis can normally provide only the temporal sequence of pottery production. To assign numerical age to pottery samples, dating methods based on physics and chemistry should be applied to them. We have conducted radiocarbon (^<14>C) dating with accelerator mass spectrometry (AMS) directly on pottery samples. The sherd fragments excavated from archeological sites normally bear charred carbonaceous materials on their surfaces. Since ^<14>C dating with AMS requires only a few mg of carbon, charred materials can be directly dated, provided that a few mg of carbon can be extracted after the server chemical treatments to remove possible carbon contamination from them. In addition, it is obvious that the charred remains on the sherds are one of the suitable carbonaceous samples to be dated. Since the materials would be the residues of food or soot from fuels used at the time of cocking, ^<14>C ages of them should provide the age of pottery usage. We applied ^<14>C dating with AMS to 16 pottery samples that had been excavated from Tsukinawate, Kadomanuma, Asahi and Hachiouji sites in the Owari region as well Shimoyasuhara, Otomonishi, Onagano sites in the Hokuriku region, central Japan. ^<14>C ages obtained for them were calibrated to calendar ages by using the internationally recommended INTCAL98 data set and compared with the archeologically estimated chronology. We would like to report here a brief outline of our sample treatment procedures and summary of ^<14>C dates and calibrated ages so far obtained.

第16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15年(2003年度)報告 Proceedings of the 16th Symposium on Researches Using the Tandetron AMS System at Nagoya University in 2003 日時:平成16(2004)年1月22日(木)、23日(金) 会場:名古屋大学シンポジオン Date:January 22nd and 23rd,2004 Place:Nagoya University Symposion Hall

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