中国四国地方で出土した銅鋺からみた国産銅鉛原材料の産出地と使用開始時期  [in Japanese] Locations of Origin of the Domestic Raw Materials for Leaded Copper and When They Started to Be Used as Seen from Bronze Bowls Excavated in Chugoku and Shikoku Regions  [in Japanese]

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Abstract

本稿では中国四国地方で出土した6~7世紀の銅鋺の考古学的知見とともに鉛同位体比,金属成分比の分析結果を報告し,あわせてその分析結果から派生する問題として国産銅鉛原材料の産出地と使用開始時期について言及した。すなわち,理化学的分析によってTK209 型式期の須恵器が共伴する無台丸底の銅鋺(津山市殿田1号墳,黒本谷古墳)に朝鮮半島産原材料,TK217 型式期の須恵器が共伴する無台平底の銅鋺(津山市荒神西古墳,竹原市横大道8号墳)に国産原材料の使用が推定され,形態的特徴と原材料との相関性とともに,国産原材料の使用開始時期が7世紀中葉に遡る可能性を示し,特に荒神西銅鋺,横大道銅鋺の鉛同位体比が古和同を含む和同開珎と近似する数値を示しており,近い値を示す長登,香春岳やその周辺の銅鉱山の開発が7世紀中葉に遡る可能性を論じた。さらに亀田修一による渡来人の関与による7世紀中葉以前に遡る国内銅生産を指摘する見解や馬淵久夫によるTK43型式期での出雲市後野産原材料使用を指摘する鉛同位体比分析結果などを踏まえると,国産原材料の使用開始時期が6世紀後葉に遡る可能性すらあることを示した。また銅鉛原材料産出地についても従来考えられてきた長登銅山周辺だけでなく香春岳や出雲市後野など,北部九州から中国山地東部にまで目を向けて探る必要性も説いた。いずれ本稿を端緒にした研究の深化を期待するものである。

This paper reports archeological findings of bronze bowls from the 6th to 7th centuries excavated in the Chugoku and Shikoku regions along with the results of lead isotope ratio and metallic composition ratio analyses, and comments on locations of origin of the domestic raw materials for leaded copper and when they started to be used.Specifically, physicochemical analysis points to raw materials originating in the Korean Peninsula in footless, rounded-bottom bronze bowls which co-occur with the type TK209 period of Sue pottery (Tsuyama City Tonoda Tumulus No.1 and Kuromotodani Tumulus) and domestic raw materials in footless, flat-bottom bronze bowls which co-occur with the type TK217 period of Sue pottery (Tsuyama City Kojinnishi Tumulus and Takehara City Yokodaido Tumulus No.8), indicating the correlation between the morphological characteristics and the raw materials and indicating the possibility that the start of domestic raw material use may go back to the mid-7th century. In particular, the lead isotope ratios of Kojinnishi bronze bowls and Yokodaido bronze bowls indicate values similar to Wadokaichin coins, including Kowado ("old Wado"), and this report discusses the possibility that the development of Naganobori, Kawaradake, and nearby copper mines, which show similar values, may go back to the mid-7th century.When such findings are taken along with Shuichi Kameda's opinion pointing out domestic copper production involving foreign settlers going back to before mid-7th century and Hisao Mabuchi's lead isotope ratio analysis results pointing out use of raw materials originating in Ushirono, Izumo City in the type TK43 period, this paper indicates that the start of domestic raw material use may even go back to the late 6th century. This paper also makes a case for the need to consider from northern Kyushu to eastern Chugoku Mountains when seeking locations of origin of the raw materials for leaded copper, including Kawaradake and Ushirono, Izumo City, in addition to the traditionally expected Naganobori copper mine area. I hope this paper intensifies further research on this topic.

Journal

  • 国立歴史民俗博物館研究報告 = Bulletin of the National Museum of Japanese History

    国立歴史民俗博物館研究報告 = Bulletin of the National Museum of Japanese History 213, 31-41, 2019-01

    国立歴史民俗博物館

Codes

  • NII Article ID (NAID)
    120006820390
  • NII NACSIS-CAT ID (NCID)
    AN00377607
  • Text Lang
    JPN
  • Article Type
    departmental bulletin paper
  • ISSN
    0286-7400
  • NDL Article ID
    029509318
  • NDL Call No.
    Z8-2017
  • Data Source
    NDL  IR 
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