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A Study of the Correlation between and Chronology of Sites of human Habitation and Volcanic Ejecta in the Izu Islands

Research Project

Project/Area Number 63580199
Research Category

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

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionMeiji University

Principal Investigator

SUGIHARA Shigeo (1989)  三重大学, 教育学部, 教授 (60024494)

杉原 重夫  明治大学, 文学部, 教授 (90061978)

Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1988: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsIzu Islands / Hchijo-jima / Tephrochronology / Aira-Tanzawa-volcanic ash / Kikai-Akahoya volcanic ash / Caldera / Jomon period / Radiocarbondating / 姶良Tn火山灰 / 鬼界-アカホヤ火山灰 / カルデラ / 縄文時代 / 放射性炭素による年代測定 / 鬼界アカホヤ火山灰 / カルデラの形成 / 降下テフラ
Research Abstract

Buried under the volcanic ejecta of the Izu Islands there have been discovered a great many sites and relics dating from the Jomon period and later. A study of the tephrochronology of the Izu Islands was undertaken by investigating the correlation between and chronology of these remains and the ejecta. The results may be summarized as follows.
1)Following an examination of widespread tephra in the Izu Islands. the stratigraphic relationship between the ejecta and Kikai-Akahoya Volcanic ash(K-Ah) on Hachijo-Jima, Miyake-jima, et.al. was clarified, and Aira-Tanzawa volcanic ash (AT) was discovered at the Hachijo-jima.
2)On the basis of its stratigraphic relationship with the sites and relies discovered in ejecta on the Izu Islands. it was ascertained that Kikai-Akahoya volcanic ash represents a maker bed for the late Initial Jomon period.
3)Following an examination of the history of the formation of Higashi-yama on the basis of tephra stratigraphy, widespread tephra, earthenware types and radiocarbon dating, it was established that the caldera was formed at a time extremely close to the ejection of Aira-Tanzawa volcanic ash 21,000 to 22,000 years ago.
4)The rhyolite and daite volcanic ash thought to originate from Kozu-shima. Ni-Jima, Bayonnaise Rocks will in the future serve as an important marker bed in Izu Island. Tephra fall from the Izu Islands was discovered in the Izu Peninsula and in the Boso peninsula. This should prove to be of considerable assistance in studies on tephrochronology of these regions.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] Shigeo Sugihara and Shizuo Oda.: "A discovery of Kikai-Akahoya ash (K-Ah) on Hachijo-jima in the Izu Islands and its significance for the chronology of Jomon sites." Sundai Historical Review no.79, pp.35-46, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Atsuko Kanauchi・Yutaka Tahara・Jun Nakamura and Shigeo Sugihara.: "Stratigraphy and Pollen Analysis of the Boring Core at Lake Ippekiko(Numa-Ike), Ito City, Shizuoka Prefecture, Japan." The Quaternary Research, 28-1, pp.27-34, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Shigeo Sugihara and Shizuo Oda.: "The Widespread Tephras(AT and K-Ah) Sandwiched in the Pyroclastic Deposits from Hachijo-jima Volcano." Program and Abstracts, he Volcanological society of Japan, no.1, pp.98, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 杉原重夫,小田静夫: "伊豆諸島の八丈島・三宅島における鬼界-アカホヤ火山灰の発見とその意義" 駿台史学. 79. 1-12 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 杉原重夫,小田静夫: "八丈島東山(三原山)火山のテフラ層中の姶良Tn火山灰・鬼界-アカホヤ火山灰の発見とその意義" 日本火山学会講演予稿集. 1. 98 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 杉原重夫: 日本火山学会講演予稿集、1989年度春季大会. 2. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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