京都市岩倉川の三畳紀放散虫年代と微小球体

DOI

書誌事項

タイトル別名
  • Radiolarian age of Triassic cherts and microspherules from the Iwakura River section, Kyoto City, Japan

抄録

The present authors conducted biostratigraphic research using fossil radiolarians on a continuous bedded chert sequence exposed on the riverbed of Iwakura River, Sakyo Ward, Kyoto City. The indicated geological ages of the chert sequence are as follows: (1) The lower to middle horizons: Anisian of the Middle Triassic, (2) the upper horizons: Anisian to Ladinian of the Middle Triassic, and (3) the uppermost horizon: Ladinian of the Middle Triassic to Carnian of the Late Triassic. Furthermore, glass and iron-rich microspherules were obtained from the chert beds. The chemical composition of the glass spherule is close to the spherules found in tephra deposits from the southern Payenia province of Argentina. However, further investigations are needed to clarify their origins.

収録刊行物

  • 化石

    化石 115 (0), 43-52, 2024-03-31

    日本古生物学会

詳細情報 詳細情報について

  • CRID
    1390862623771065088
  • DOI
    10.14825/kaseki.115.0_43
  • ISSN
    24242632
    00229202
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
  • 抄録ライセンスフラグ
    使用不可

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