Metallurgical re-investigation of ancient Chinese coins in the collection of Tokyo Institute for Oriental Culture, now in Institute of Advanced Studies on Asia, University of Tokyo has been carried out by scanning electron microscopy and semi-quantitative X-ray analyses. Cross-sections of 132 objects, mostly from the Warring States Period, were studied and were classifies as metallic copper (Cu) and bronze (Cu-Sn) objects. Based on chemical compositions, Cu-objects were divided into 3 groups, such as almost Cu-metal, Cu with Pb + Arsenic (As), and Cu with Pb + As + antinomy (Sb). Likewise, bronze objects were divided into 4 groups, such as bronze with Pb, bronze with Pb + As, bronze with Pb + Sb, and bronze with Pb + As + Sb. Leaded bronze are separated in low (<3 wt.％) and high-Pb (up to 45 wt.％) groups. Sn ratio (Sn/[Cu+Sn]) in bronzes range from low (2％) to high (20％) Sn. Most of objects contain a few amounts of miner elements, such as iron (Fe), silver (Ag), cobalt (Co) and some Cu and/or Fe sulfides. There elements might be originated from metallic ores and low qualities of parent metals. Since As and Sb are characteristic elements in metallic objects of “the eastern Eurasian steppe”, it might be suggested such origin. Pb is a fusion agent to lowering of melting temperature of molten Cu and bronze. In comparison to the Pb contents in Anyang (Yinxu) Bronzes in the Academia Sinica collection (many are < 2wt％ Pb), Pb contents are extremely high in high-Pb bronze group. Such objects with various Sn-ratios with As and Sb might suggest recycling work of metal in ancient societies. Thus, chemical signature might not always be related to their origins of ore minerals in the objects.
雑誌名
東洋文化研究所紀要 = The memoirs of Institute for Advanced Studies on Asia
巻
177
ページ
176 - 92
発行年
2020-03-31
ISSN
05638089
書誌レコードID
AN00170926
著者版フラグ
publisher
出版者
東京大学東洋文化研究所
出版者別名
Institute for Advanced Studies on Asia, The University of Tokyo
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東方文化学院（東京研究所）旧蔵戦国貨幣の金相学的再検討
ioc177003.pdf
(58.25MB)
