誘導結合プラズマ発光分光分析（ＩＣＰ‐ＡＥＳ）による東北北部古代土器の胎土分析

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  • Chemical Analysis of Ancient Pottery from the Northern Tohoku Region in Japan by ICP-AES.
  • ユウドウ ケツゴウ プラズマ ハッコウ ブンコウ ブンセキ ICP AES ニ ヨル トウホク ホクブ コダイ ドキ ノ タイド ブンセキ

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ICP-AES was used to determine the major and trace element compositions of 158 pottery shards dating from the 8th to 11th centuries excavated from the northern Tohoku region and 52 Quaternary clay samples collected from the same region. The chemical composition of the pottery was similar to that of the Quaternary clay near ancient sites. Concentrations of Ca, K, and Na in the pottery and clay change systematically from the area near the Japan Sea to the area near the Pacific in the northern Tohoku region. The transition of concentrations of Ca, Na, and K was similar to that of Quaternary volcanic products of the Tohoku region. It is likely that the pottery was made with the clay, which was altered from Quaternary volcanic ash around ancient sites.<br>I developed three indicators: K/Na+Ca, Ca/Na+K, and Ti/Al+Fe+Mg. Ca, Na, and K are three of the main elements constituting feldspars. Ti, Fe, and Mg are the main elements constituting mafic minerals. Al is abundant in the clay. These indicators show that the element composition of the pottery and the Quaternary clay vary systematically from the region near the Japan Sea to the region near the Pacific. These indicators are useful for provenance studies of pottery from the northern Tohoku region.<br>The results of this study suggest that in the 8th to 11th centuries, potteries were produced around the sites and utilized there, and that there was no distribution of potteries in wide areas of the northern Tohoku region.

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