富山県, 鮮新-更新統十二町層中部から見いだされた穂高-Kd39テフラと恵比須峠-福田テフラおよびその層位 The Hotaka-Kd39 Tephra and Ebisutoge-Fukuda Tephra from the Middle Part of the Junicho Formation, Toyama Prefecture, Central Japan, and Their Stratigraphic Position

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十二町層は富山県氷見市周辺に分布する鮮新-更新統の海成層である.同層中部において,火山灰層の分析と古地磁気の検討を行った結果,鮮新-更新統境界付近に位置する穂高-Kd39テフラと恵比須峠-福田テフラを見いだした.両テフラの発見により,これまで下部鮮新統とされてきた同層中部の堆積サイクルは,鮮新-更新統境界を含む可能性が高い.また,両テフラは同層中部の堆積サイクルIIIに位置し,酸素同位体ステージ63に対応する間氷期に堆積したと推定される.

The Junicho Formation consists of late Pliocene to early Pleistocene marine sediments that crop out near Himi City, northwest of Toyama Prefecture. The Junicho Formation was reported to include the Plio-Pleistocene boundary based on calcareous nannofossil biostratigraphy. Sedimentary cycles derived from glacioeustatic sea-level change were also reported from the middle part of the Junicho Formation. In order to date of the middle part of the Junicho Formation, the authors analyzed chemical components of volcanic glass in volcanic ash beds by energy dispersive X-ray spectrometry (EDS) to correlate with widespread volcanic ashes in central Japan. The authors also measured paleomagnetic directions of the sediments. The results showed that the volcanic ash beds in the Junicho Formation correlate with the Hotaka-Kd39 and Ebisutoge-Fukuda tephras which were previously reported from horizons of Plio-Pleistocene boundary in the Kazusa Group at the Boso Peninsula. Examination of the magnetostratigraphic relationship of the Hotaka-Kd39 and Ebisutoge-Fukuda tephras in the Junicho Formation proved that they were consistent with those in Boso Peninsula. Horizons of the Hotaka-Kd39 and Ebisutoge-Fukuda tephras belong to the sedimentary cycle III in the middle part of the Junicho Formation, and therefore the sedimentary cycles of the middle part of the Junicho Formation clearly include the Plio-Pleistocene boundary. In the Junicho Formation, the Hotaka-Kd39 and Ebisutoge-Fukuda tephra deposited during relative sealevel highstand that estimated Oxygen Isotope Stage 63.

収録刊行物

  • 第四紀研究

    第四紀研究 41(6), 429-442, 2002-12-01

    Japan Association for Quaternary Research

参考文献:  39件中 1-39件 を表示

被引用文献:  1件中 1-1件 を表示

各種コード

  • NII論文ID(NAID)
    10010427911
  • NII書誌ID(NCID)
    AN0034136X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04182642
  • NDL 記事登録ID
    6373025
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-67
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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