湖底堆積物から見た浜名湖の最近1,000年間の古環境変遷 Paleo-environmental Changes during the Last 1,000 Years from Lake Deposits at Lake Hamana, Central Japan

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The bore-hole samples were taken at three sites in Lake Hamana, a brackish lagoon, central Japan, to reconstruct paleo-environmental changes. The paleo-environmental changes during the last 1,000 years were presumed by lithofaces sequences and diatom assemblages from lake deposits, as follows. Zone I (AD 1000~1498): A lot of trace fosssils were found from sediments.Aulacoseira granulata, a freshwater diatom species, was dominated. Sea water hardly came into the lake basin, and salinity of the lake water was nearly fresh water. Zone II a (AD 1498~1550): The tsunami of the Meiou Earthquake in 1498 and the huge storm in 1499 made a small waterthrough between the lake and the sea, called Imakireguchi at the southern edge of the lake. The salinity of the lake had increased suddenly, and Thalassionema nitzschioides and Thalassiosira spp. , marine diatom species, were dominated. Zone III b(AD 1550~1700): Salinity of the lake water fell down because of the increase of Cyclotella caspia, a brackish diatom. The distinct white-gray laminated structure formed at lake sediments. Zone IV c (AD 1700~1850): Salinity of the lake water increased again and Thalassionema nitzschioides and Thalassiosira spp. were dominated. Zone V d (AD 1850~1970) was dominated again. The decrease of the salinity occurred again. Zone VI e (AD 1970~): The artificial construction of the water pass at Imakireguchi was done in 1954~1973. The salinity of the lake has been maintained at the higher level since then.

収録刊行物

  • Laguna : 汽水域研究

    Laguna : 汽水域研究 4, 69-76, 1997-03

    島根大学

各種コード

  • NII論文ID(NAID)
    110000994127
  • NII書誌ID(NCID)
    AN10439529
  • 本文言語コード
    JPN
  • 資料種別
    Departmental Bulletin Paper
  • 雑誌種別
    大学紀要
  • ISSN
    13403834
  • NDL 記事登録ID
    4215333
  • NDL 雑誌分類
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL 請求記号
    Z15-B42
  • データ提供元
    NDL  NII-ELS  IR 
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