畫紋帶神獸鏡の東傳 --型式と鉛同位體比からみた九子派の動態--

Abstract

In the Sichuan Basin, there were two groups of mirror workshops in the 2nd century, the Guanghan 廣漢 school and the Jiuzi 九子 school. The Guanghan school created the motif of divinities and animals (Shen-shou 神獸), animal heads (Shou-shou 獸首) and eight-phoenix (Ba-feng 八鳳) mirrors by order from Shang-fang 尙方of the Imperial Department, while Jiuzi school created the mirrors with figures of deities on three panels 三段式神仙鏡, which were distributed mainly in the local area. In the third quarter of the 2nd century, the Jiuzi school imitated the Shen-shou mirrors with ring-like nipples (環狀乳) of the Guanghan school, and after trial and error, created the contraposition styles(對置式) of Shen-shou mirrors. Since this type mirrors are mainly excavated from the middle reaches of the Changjiang River, it has been thought that Jiuzi's workshops were relocated from the Sichuan. But three specimens of Jiuzi's mirrors found to contain lead of anomalous isotope ratios called Mississippi Valley type (MVT) in isotope geology, and these mines are found in a border region between Sichuan and Yunnan Provinces. I propose that this type of Shen-shou mirrors were consistently made in the Sichuan and may have been transported to the eastern region.