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Study of latest Cretaceous Radiolarian Assemblage and the faunal change in northern Japan

Research Project

Project/Area Number 62540592
Research Category

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

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

Principal Investigator

IWATA Keiji  Faculty of Science, Hokkaido University, 理学部, 助手 (60002226)

Co-Investigator(Kenkyū-buntansha) JOUR Fac.Sci  , (KATO,Yukihir)
WATANABE Yasushi  Geological Survey of Japan, Sapporo Branch, 研究員 (90358383)
NAKAMURA Koji  Faculty of Science, Hokkaido University, 理学部, 教授 (40000822)
EARTH Scienc  41, 教授
UOZUMI Satoru  Faculty of Science, Hokkaido University (20000763)
Project Period (FY) 1987 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1987: ¥800,000 (Direct Cost: ¥800,000)
KeywordsHakobuchi Group / Hidaka Supergroup / Yubetsu Group / Nemuro Group / Upper Cretaceous / Radiolarian Biostrtigraphy / 化石群集変遷 / 化石分帯 / 分帯
Research Abstract

The authors investigated especially the radiolarian biostratigraphy of the Hakobuchi Group of Nakatonbetsu region in the northern Hokkaido. As a result, two radiolarian zonations of the latest Cretaceous System - Protoxiphotractus perplexus zone (early - middle Campanian) and Chlathrocyclas gravis zone (late Campanian - early Maastrichtian) were established. The former zone corresponds to Amphipyndax enesseffi zone and the latter corresponds to Amphipyndax tylotus zone of the Upper Cretaceous in the Tropical Pacific Oceans and the southwestern Japan. The fanual difference between the Hakobuchi Group and the Hidaka Supergroup was distinguished. Namely, amphipyndax enesseffi and A. tylotus assemblage were found in the Hidaka Supergroup, but these assemblages were completely absent in the Hakobuchi Group. Faunal difference among the Hakobuchi Group, Hidaka Supergroup, and the Upper Cretaceous Systems in the southwestern Japan suggests differences of paleogeography and accumulation sites of sediments9 Abrupt decline of late Cretaceous radiolarians was detected in the Hakobuchi Group, but some genera of Cretaceous type persist into the early Paleocene epoch.

Report

(3 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Watanabe, Yasushi; Iwata, Keiji: "The Hidaka Supergroup in the Tomuraushi region, Hidaka Belt, Hokkaido, Japan" Earth Science. 41. 35-47 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Iwata, Keiji: "Radiolarian Biostratigraphy of the Hakobuchi Group in the Nakatonbetsu region ( preliminary report )" HSG Newsletter. 3. 1-8 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Iwata, Keiji: "Re-investigation of radiolarians of the Yoyosato Formation in the Yubetsu Group" HSG Newsletter. 3. 9-10 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Iwata, Keiji; Tajika, Jun: "Jurassic and Cretaceous radiolarians from the pre-Tertiary System in the Hidaka Belt, Maruseppu region, northeast Hokkaido" Journal of Faculty of Science, Hokkaido University. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Kato, Yukihiro; Iwata, Keiji: "Radiolarian biostratigraphic study of the pre-Tertiary System around the Kamikawa Basin, central Hokkaido, Japan" Journal of Faculty of Science, Hokkaido University. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 岩田圭示: HSGニュースレター. 3. 1-8 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 岩田圭示: HSGニュースレター. 3. 9-10 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] IWATA,Keiji and TAJIKA,Jun: Jour.Fac.Sci,Hokkaido University.

    • Related Report
      1988 Annual Research Report
  • [Publications] WATANABE,Yasushi: Earth Science. 41. 35-47 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 岩田 圭示: HSGニュースレター. 3. 1-8 (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] IWATA,Keiji: Jour.Fac Sci,Hokkaido University.

    • Related Report
      1987 Annual Research Report
  • [Publications] Kato,Yukihiro: Jour.Fac.Sci,Hokkaido University.

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2017-04-05  

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