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Studies to attain high accuracy in radiocarbon dating with AMS of sedimentary samples older than 30,000y.B.P.

Research Project

Project/Area Number 03640656
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Stratigraphy/Paleontology
Research InstitutionNagoya University

Principal Investigator

NAKAMURA Toshio  Nagoya University, Dating and Materials Research Center, associate professor, 年代測定資料研究センター, 助教授 (10135387)

Co-Investigator(Kenkyū-buntansha) SAKAMOTO Toru  Nagoya University, Graduate School of Human Informatics, professor, 人間情報学研究科, 教授 (80205773)
NAKAI Nobuyuki  Nagoya University, School of Science, honorary professor, 名誉教授 (40022529)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordsage measurement / radiocarbon dating / accelerator mass spectrometry / tandem accelerator / geochronology / tephrochronology / cross-dating / sample contamination / 年代測定比較検定 / 野尻湖層の編年 / タンデトロン / 木造川泥流堆積物 / 東京軽石流堆積物
Research Abstract

Radiocarbon (^<14>C) dating with accelerator mass spectrometry (AMS) has enabled us to measure ages of geological samples as old as 40 to 60 ky.B.P. with a reasonable accuracy. This study has been organized to test the reliability of ^<14>C dates of 40 to 60 ky.B.P. The samples are collected in geological and geographical fields, mainly selected from well-defined horizons, i.e., those horizons identified by tephrochronology.
With this investigation, the followings have been clarified, concerning the age dating of old samples with a Tandetron accelerator mass spectrometer:
(1)^<14>C dates are consistent with sedimentary horizons, for ages from 40 to 60 ky.B.P.
(2)For ^<14>C dates beyond 60ky.B.P., a saturation of ^<14>C dates comes up, and ^<14>C dates are no more consistent with sedimentary sequences. The appearance of the plateau in ^<14>C dates is expected from the observation that dead graphite, which is too old to contain ^<14>C, showed apparent ^<14>C dates of 60 to 70 ky.B.P (average value: 65,080 y.B.P.).
^<14>C dates are compared with those dates measured by some other dating methods in this investigation. The ^<14>C dates of charcoal collected from Tokyo pumice flow deposits are compared with a fission-track date of obsidian collected from Tokyo pumice deposits, and the ^<14>C dates of charcoal from the Ontake volcanic deposits with a K-Ar age of lava covering the deposits. The comparisons showed a good agreement. Details of the experiments are given elsewhere. Consistency tests among different dating methods are one of the important themes to be performed intensively.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] 中村 俊夫: "岐阜県八百津町の木曽川泥流堆積物から採取された埋没樹木の加速器^<14>c年代" 第四紀研究. 31. 29-36 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中村 俊夫: "東京軽石流堆積物中の炭化木片の加速器質量分析による放射性炭素年代" 地質学雑誌. 98. 905-908 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 左合 勉: "岐阜県小坂町濁河川流域に分布する御岳火山噴出物から産出した炭化木片の加速器^<14>C年代" 名古屋大学古川総合研究資料館報告. 8. 17-26 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 川上 紳一: "加速器質量分析計による長野県木曽郡王滝村滝越湖成層中の木片の^<14>C年代-御岳火山活動期についての一資料-" 火山. 37(5). 265-268 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 沢田 健: "加速器質量分析計を用いた^<14>C年代測定による野尻湖層の編年" 地球科学. 46. 133-142 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中村 俊夫: "加速器質量分析法による放射性炭素年代測定の正確度の向上についての検討" 富山県地学地理学研究論集. 10. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Nakamura,T.Fujii,K.Shikano, and Fieldwork Group of Kiso Valley Quaternary: "Radiocarbon ages by accelerator mass spectrometry of the buried wood trunks from Kisogawa volcanic mudflow deposits at Yaotsu-cho, Gifu prefecture" The Quaternary Research. 31. 29-36 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Nakamura, S.Oka and T.Sakamoto: "Radiocarbon ages of charred wood from Tokyo pumice flow deposit measured with a Tandetron accelerator mass spectrometer" Jour. Geol. Soc. Japan. 98. 905-908 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Sago, G.Ueno,T.Nakamura, A.Ikeda, and T.Sakamoto: "Radiocarbon dates by accelerator mass spectrometry of wood charcoal from the Ontake volcanic deposits distributed along the Nigorigo-gawa,Osaka-cho,Gifu pref." Bill. Nagoya Univ. Furukawa Museum. 8. 17-26 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] S.Kawakami, Y.Kanaori, T.Arakawea and T.Nakamura: "Accelerator mass-spectrometric Radiocarbon ages of wood materials from the Late Pleistocene Takigoshi lacustrine sediments-Data on the volcanic history of the Ontake volcano, central Japan-" Volcano. 37. 265-268 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Sawada, Y.Arita, T.Nakamura, M.Akiyama, T.Kamei and N.Nakai: "^<14>C dating of the Nojiri-ko Formation using accelerator mass spectrometry" Earth Science. 46. 133-142 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] T.Nakamura: "Studies to attain high accuracy in radiocarbon dating with accelerator mass spectrometry" Memoirs of Geological & Geographical Research,Toyama Prefecture. 10.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中村 俊夫: "岐阜県八百津町の木曽川泥流堆積物から採取された埋没樹木の加速器^<14>C年代" 第四紀研究. 31. 29-36 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 俊夫: "東京軽石流堆積物中の炭化木片の加速器質量分析による放射性炭素年代" 地質学雑誌. 98. 905-908 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 左合 勉: "岐阜県小坂町濁河川流域に分布する御岳火山噴出物から産出した炭化木片の加速器^<14>C年代" 名古屋大学古川総合研究資料館報告. 8. 17-26 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 川上 紳一: "加速器質量分析計による長野県木曽郡王滝村滝越湖成層中の木片の^<14>C年代ー御岳火山活動期についての一資料ー" 火山. 37(5). 265-268 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 沢田 健: "加速器質量分析計を用いた^<14>C年代測定による野尻湖層の編年" 地球科学. 46. 133-142 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 俊夫: "加速器質量分析法による放射性炭素年代測定の正確度の向上についての検討" 富山県地学地理学研究論集. 10. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 俊夫: "加速器法による4万年前より古い試料の ^<14>C年代測定についての検討." 堆積学研究会報. 34. 27-32 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 藤井 昭二: "安房トンネル平湯低速度帯から産出した材遺体の ^<14>C年代=アカンダナの活動歴." 第四紀研究. 30. 103-106 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Nakamura: "Measurements of Radiocarbon Concentrations by accelerator mass spectrometry in the bottom sediments from Lake Tilitso in Nepal,Himalayas." Mass Spectrometry(質量分析). 39. 301-313 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 中村 俊夫: "岐阜県八百津町の木曽川泥流堆積物から採取された埋没樹木の加速器 ^<14>C年代" 第四紀研究. 31. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 沢田 健: "加速器質量分析を用いた^<14>年代測定による野尻湖層の編年" 地球科学. 46. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 中村 俊夫: "東京軽石流堆積物中の焼けた木片の加速器質量分析計による放射性炭素年代測定" 地学雑誌.

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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