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2005 Fiscal Year Final Research Report Summary

High-resolution reconstruction of the paleoenvironmental changes since the Last Glacial by the analyses of highland moor deposits

Research Project

Project/Area Number 14380034
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 自然地理学
Research InstitutionMuseum of Nature and Human Activities, Hyogo

Principal Investigator

KATO Shigehiro  Museum of Nature and Human Activities, Hyogo, Division of Natural History, Chief researcher, 自然・環境評価研究部, 主任研究員 (50301809)

Co-Investigator(Kenkyū-buntansha) SATO Hiroshi  University of Hyogo, Institute of Natural and Environmental Sciences, Professor, 自然・環境評価研究部, 教授 (80254457)
HYODO Masayuki  Kobe University, Research Center for Inland Seas, Professor, 内海域環境教育研究センター, 教授 (60183919)
YAGI Tsuyoshi  Museum of Nature and Human Activities, Hyogo, Division of Natural History, Chief researcher, 自然・環境評価研究部, 主任研究員 (40311485)
HANDA Kumiko  Museum of Nature and Human Activities, Hyogo, Division of Natural History, Chief researcher, 自然・環境評価研究部, 主任研究員 (20311483)
Project Period (FY) 2002 – 2005
KeywordsMoor deposits / Last Glacial / Paleoenvironmental changes / Tephra correlation / AMS-^<14>C dating / Pollen analysis / Paleomagnetic secular variation / Oriented core sampling
Research Abstract

Five all-cored sediments were taken at the Ohnuma Moor in the northern part of Hyogo Prefecture, three of which were the oriented samples obtained by newly developed non-magnetic core samplers. Synthetic analyses of the core sediments were performed including petrologic analysis of tephra layers, AMS-^<14>C dating, pollen and diatom analyses, and physical measurements of lightness, grain size, loss on ignition, magnetic susceptibility, and paleomagnetic secular variation (PSV), to clarify the paleoenvironmental changes since the Last Glacial and the formative processes of the moor. More than 65-m thick deposits underlie the Ohnuma Moor. The upper part about 50-m thick is composed mainly of sand and gravels, while the finer sediments about 17-m thick, mainly of clay and peat, comprise the upper part containing six tephra layers of K-Ah, SUk, MsP, Sh, AT, and Nh. Based on the estimated eruption ages of K-Ah and AT and more than 30 AMS-^<14>C dates along with the results of diatom analysis, it is inferred that the Ohnuma Moor originated the depression formed by the large scale landslide at ca.41 ka cal.BP and has been developed as a mire between ca.32 and 29 ka cal.BP and after ca.13 ka cal.BP and as a wetland until ca.32 ka cal.BP and from ca.29 to 13 ka cal.BP. All measured physical properties show the cyclic changes with small amplitude for the time interval from 41 to 13 ka cal.BP without the air fall tephra horizons. The temporal changes are possible to reflect the global climatic changes named the Dansgaadrd-Oeschger Oscillations with Heinrich Events. The PSV can be reconstructed mainly for the period between 35 and 32 ka cal.BP, suggesting the effectiveness of the new sampling method. However, it is necessary to improve it because the core samples were disturbed especially at their uppermost and lowermost parts.

  • Research Products

    (6 results)

All 2006 2004

All Journal Article (6 results)

  • [Journal Article] 近畿地方北部の中部更新統・福知山層のテフラの対比2006

    • Author(s)
      加藤茂弘, 山下 透, 檀原 徹
    • Journal Title

      人と自然(兵庫県立人と自然の博物館和文紀要) 16

      Pages: 35-42

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 中国山地東部の大沼湿原堆積物に挟まれるテフラの対比と推定噴出年代2006

    • Author(s)
      加藤茂弘, 半田久美子ほか5名
    • Journal Title

      名古屋大学加速器質量分析計業績報告書 XVII

      Pages: 77-90

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Correlation of the tephra layers in the Middle Pleistocene Fukuchiyama Formation in the northern Kinki District, West Japan.2006

    • Author(s)
      Katoh, S., Yamashita, T., Danhara, T.
    • Journal Title

      Humans and Nature (Hito-to-Shizen)(Museum of Nature and Human Activities, Hyogo) 16

      Pages: 35-42

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Correlation and AMS-^<14>C dating of the late Pleistocene tephra layers in the Ohnuma Moor deposits in the eastern part of the Chugoku Mountains, Western Japan.2006

    • Author(s)
      Katoh, S., Handa, K., Hyodo, M., Sato, H., Nakamura, T., Yamashita, T., Danhara, T.
    • Journal Title

      Summaries of Researchers using AMS at Nagoya University(Center for Chronological Research, Nagoya University) XVII

      Pages: 77-90

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 大山テフラの岩石記載的特徴と大山最下部テフラ層中のテフラの対比2004

    • Author(s)
      加藤茂弘, 山下 透, 檀原 徹
    • Journal Title

      第四紀研究 43

      Pages: 435-445

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Correlation among the tephra layers in the Lowest Daisen Volcanic Ash Formation, Western Japan, on the basis of their petrographic properties.2004

    • Author(s)
      Katoh, S., Yamashita, T., Danhara, T.
    • Journal Title

      The Quaternary Research (Daiyonki Kenkyu) 43

      Pages: 435-445

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

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Published: 2007-12-13  

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