납동위원소비 분석을 활용한 인용사지 출토 청동기의 원료 산지 연구
Lead Isotope Analysis of Bronze Artefacts excavated from Inyongsaji Site
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초록
인용사지에서 출토된 청동기 5점으로부터 채취한 시료를 대상으로 원료의 기원과 이동을 확인하기 위해 성분분석 및 납동위원소비 분석을 실시하였다. 인용사지에서 출토된 청동기는 구리 및 주석의 이원계 합금으로 제작되어 납이 인위적으로 첨가되지 않음을 확인할 수 있었다. 또한 출토 청동기의 납동위원소비 분석 결과, Mabuchi(1985)의 분포도에 의해 한반도 남부 및 중국 남부 지역에 포함됨을 확인하였으며, 한반도 납동위원소 분포도에 도시하여 태백산분지인 Zone 2 및 옥천변성대에 해당하는 Zone 3에 위치함을 알 수 있었다. 대상 유물은 모두 납의 함량이 상당히 적은 주석청동으로, 이때의 납동위원소비는 구리 광석의 산지에서 기인하는 것으로 추정할 수 있다. 납동위원소비 분석은 납을 미량으로 포함한 모든 유물에 적용 가능하므로, 다양하게 해석할 수 있으며, 추가적인 데이터의 확보와 연구를 통해 산지 추정 연구의 신뢰성을 높일 수 있을 것이라 판단된다.
Abstract
Chemical and Pb isotope analysis were performed in order to determine the origin of bronze artefacts excavated from the Inyongsaji site in South Korea. The result of ICP-MS shows that they are tin bronzes in which lead was not intentionally added during production. Pb isotope data analyzed by TIMS are plotted in the southern region of Korea and China of the distribution map drawn by Mabuchi(1985). On the other hand, the identical isotope data are plotted in the Taebaek basin and the Olcheon metamorphic belt correspondent to zone2 and zone3 respectively. It is believed that the isotope data on the tin bronzes which have very low lead content can be used to trace the origin of copper ore rather than those of either lead or tin ore. Pb istope analysis allows diverse interpretation as it can be applied to any object containing trace amounts of lead. In addition, accumulation of isotope data as well as further studies will improve reliability of the provenance studies.
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