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1996 Fiscal Year Final Research Report Summary

Organic reef frameworks and their geohistory in Paleo-Pacific Ocean

Research Project

Project/Area Number 07640617
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Stratigraphy/Paleontology
Research InstitutionMiyagi Universitry of Education

Principal Investigator

KAWAMURA Toshio  Miyagi Universitry of Education, Associate Professor, 教育学部, 助教授 (60186145)

Project Period (FY) 1995 – 1996
Keywordsorganic reefs / reef framework / Paleopacific Ocean / oceanic seamounts / reef mounds / reef-building organisms / Paleozoic / Mesozoic
Research Abstract

Carboniferous to Jurassic organic reefs of the Paleo-Pacific (Panthalassa) Ocean were investigated from the viewpoints of internal frameworks reflecting their reef morphology, biotic compositions, and community structure. Time and space distributions and features of Paleo-Pacific reefs were well understood after progressive interpretations of several causes, suggested both by non-biological factors of paleogeographic, paleoclimato-oceanographic and paleo-eustatic controls, and by biological backgrounds of mass-extinctions and evolution of reef ecosystems. The results are summarized as follows :
1)Ancient organic reefs and mounds tend to have been unevenly distributed in the Paleopacific paleogeography. These tendencies were certainly caused by the positions of moving continental blocks in low latitude region and by the dominance of warm ocean-currents and upwellings. Their recent maldistributions were resulted from a tectonic dislocating and traveling of separated oceanic plates.
2)Development of Paleo-Pacific reefs had rise and fall during Late Paleozoic to Mesozoic period. The long-term vicissitudes reflect the changes of ocean current systems and indeed several mass-extinctions and then recoveries.
3)Reefs on seamounts and isolated arc-islands tend to have smaller morphology, firmer framework, and higher bio-diversity than those on epicontinental shelves, influenced not only by their topographic and marine conditions, but also by ocean current systems and eustatic changes.
4)Comparing Paleopacific reefs with Tethyan reefs, more or less differences are present in each geologic period. The important cause of those differences was the location of moving continental blocks and changes of global ocean water circulation.
5)Several reefs of seamounts and arc-islands include unique or peculiar examples which may become a significant evidence for a reef evolution.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 川村寿郎: "古生代末期における冷水性炭酸塩の堆積相と生物相-スピッツベルゲン島上部ペルム系の例-." 地質学雑誌. 101. 878-888 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawamura,T.and Machiyama,H.: "A Late Permian coral reef complex,South Kitakami Terrane,Japan." Sedimentary Geology. 99. 135-150 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川村寿郎 ほか4名: "南部北上帯古生界標準層序と″早池峰構造帯″." 日本地質学会第103年学術大会見学旅行案内書. 59-97 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鈴木紀穀・高橋大樹・川村寿郎: "釜石地域の中部古生界から産出するシルル紀後期・デボン紀前期放散虫化石." 地質学雑誌. 102. 824-827 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 川村寿郎: "南部北上帯の石炭系-地質図の公表-." 加藤 誠教授退官記念論文集. 215-228 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawamura, T.: "Bio-and sedimentary facies of the Upper Permian cool-water shelf carbonates in Spitsbergen." Journal of Geological Society of Japan. 101. 878-888 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawamura, T., and Machiyama, H.: "A Late Permian coral reef complex, South Kitakami Terrane, Japan." Sedimentary Geology. 99. 135-150 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawamura, T., Iryu, Y., Kawamura, M., Machiyama, H., and Yoshida, K.: "Standard lithostratigraphic succession of the Paleozoic Systems in South Kitakami Terrane and the geologic significance of "Hayachine Tectonic Belt"." The 103rd Annual Meeting of Geological Society of Japan, Excursion Guidebook. 59-97 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suzuki, N., Takahashi, D., and Kawamura, T.: "Late Silurian and Early Devonian Polycytine (Radiolaria) from the Middle Paleozoic deposits in the Kamaishi area, northeast Japan." Journal of Geological Society of Japan. 102. 824-827 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kawamura, T.: "Local geologic maps for the Carboniferous stratigraphy of the South Kitakami Terrane, northeast Japan." Commemorative Volume of Professor M.Kato. 215-228 (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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