この文献の参照には次のURLをご利用ください : https://doi.org/10.15027/53946
広島大学埋蔵文化財調査研究紀要 14 号
2023-03-31 発行
東広島キャンパス出土弥生土器と西条盆地土壌の砂粒分析と同位体比からみた土器粘土産出地の一考察
Clay producing areas: Analysis of sand grains and isotope ratios in Yayoi pottery excavated from Higashi-Hiroshima campus and Saijo Basin soil
石丸 恵利子
申 基澈
米田 穣
Abstract
To assess the production and distribution of Yayoi pottery in the Saijo Basin, we conducted sand grain and isotope analyses of pottery and soil. The former was performed using the following materials: six pieces of Late Yayoi period pottery excavated from the Kagaminishitani (KN) site, four from the Yamanakaikeminami 2 (YM2) site, 10 soil samples from the Saijo Basin, four from the KN site, and three from the YM2 site.
The analyses revealed that the main composition of the Saijo Basin soil is quartz mineral and granite rock fragments, most contain mica, and NO.5 (HH-S-05) is prominent. Pottery from the KN site contains a lot of quartz and granite, and almost no tuff. The grain size composition of the clay of the Saijo group pottery (KN-P-05-07) is mainly composed of coarse- and medium-grained sand. Southern Bingo group pottery (KN-P-01-02) has a high ratio of ultra-fine sand. The soil from the KN site contains a lot of mica, but it contains almost no earthenware. The pottery from the YM2 site contains almost no mica or tuff, while the soil contains small amounts, which is different from earthenware. The characteristics are also different from the soil from KN.
Strontium (Sr)-Neodymium (Nd)-Lead (Pb) isotope analysis of two soil samples indicated that the isotope ratio of the Saijo Basin was different from that of the Takamatsu Plain and Mt. Hiei. If the isotope ratio of the soil, which has characteristics similar to those of YM2 pottery, matches, this will provide strong evidence of the production area. The pottery from KN also has different compositions between the Saijo and southern Bingo groups, so it is possible that the results of isotope analysis will prove that the production areas are different.
Increasing the number of samples and considering the results of isotope analysis are future tasks. The fact that we were able to determine the characteristics of the soil of the Saijo Basin and the rock and mineral composition and grain size of the excavated Yayoi pottery is a great achievement.
The analyses revealed that the main composition of the Saijo Basin soil is quartz mineral and granite rock fragments, most contain mica, and NO.5 (HH-S-05) is prominent. Pottery from the KN site contains a lot of quartz and granite, and almost no tuff. The grain size composition of the clay of the Saijo group pottery (KN-P-05-07) is mainly composed of coarse- and medium-grained sand. Southern Bingo group pottery (KN-P-01-02) has a high ratio of ultra-fine sand. The soil from the KN site contains a lot of mica, but it contains almost no earthenware. The pottery from the YM2 site contains almost no mica or tuff, while the soil contains small amounts, which is different from earthenware. The characteristics are also different from the soil from KN.
Strontium (Sr)-Neodymium (Nd)-Lead (Pb) isotope analysis of two soil samples indicated that the isotope ratio of the Saijo Basin was different from that of the Takamatsu Plain and Mt. Hiei. If the isotope ratio of the soil, which has characteristics similar to those of YM2 pottery, matches, this will provide strong evidence of the production area. The pottery from KN also has different compositions between the Saijo and southern Bingo groups, so it is possible that the results of isotope analysis will prove that the production areas are different.
Increasing the number of samples and considering the results of isotope analysis are future tasks. The fact that we were able to determine the characteristics of the soil of the Saijo Basin and the rock and mineral composition and grain size of the excavated Yayoi pottery is a great achievement.
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本研究は、総合地球環境学研究所の同位体環境学共同研究事業の支援により行った
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