論文の公開元へ滋賀県多賀町敏満寺遺跡石仏谷墓跡出土火葬骨のSr同位体分析
概要
Bone mineral components (bioapatite) are susceptible to soil contamination during burial, but bones heated at high temperatures (>600°C) could retain their original information due to increased crystallinity. Many cremated bones heated with high temperature were excavated from the Ishibotokedani Hakaato site in Binman-ji Temple in Taga, Shiga Prefecture. It is thought that the buried people are monks and ordinary people of Binman-ji Temple in the 12th and 15th centuries. The purpose of this study is to reveal the living area of the buried people by Sr isotopic analysis of the cremated bones from the Ishibotokedani Hakaato site, and to get information about the cultural history of the Middle Ages in Japan. Stream sediments and water from rivers (Uso, Inukami, and Seri Rivers) flowing in the surrounding area, soil from Ishibotokedani site were collected and measured of 87Sr/86Sr. The exchangeable (ex) fraction, which is obtained by extraction with 1M CH3COONH4, of the stream sediment showed a very close values (0.70926 to 0.71176) to those of stream water and cremated bone. The ex fraction of stream sediment and stream water of Uso River and Inukami River, where Koto Rhyolite is distributed, have 87Sr/86Sr values of 0.71135 to 0.71176, and stream water of Seri River, where limestone and basic volcanic rocks are distributed, has a low value of 0.71093. Furthermore, the cremated bones from the Ishibotokedani site showed 87Sr/86Sr of 0.70990 to 0.71037, agreement with 87Sr/86Sr values of the ex fraction of the Ishibotokedani soil and stream water of Seri River. These results suggest that the cremated bones from the Ishibotokedani site might belong to the people who lived around Binman-ji Temple or near Seri River.
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