Stratigraphy of the Tetori Group and the Jinzu Group(new name)in Gifu and Toyama prefectures, central Japan

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  • Matsukawa Masaki
    Department of Environmental Sciences, Tokyo Gakugei University
  • Fukui Makiko
    Graduate School of Education, Earth and Environmental Sciences Course, Tokyo Gakugei Univ. present address: Attached Junior High School in Tokyo Gakugei Univ.
  • Ogawa Yutaka
    Graduate School of Education, Earth and Environmental Sciences Course, Tokyo Gakugei Univ. present address:Tokyo Custom
  • Tago Takeshi
    Graduate School of Education, Earth and Environmental Sciences Course, Tokyo Gakugei Univ. present address: Abashiri Daisan Junior High School
  • Koarai Kazuto
    Keio Shonan Fujisawa Junior and Senior High School
  • Ohira Hiroto
    Department of Geoscience, Shimane Univ.
  • Hayashi Keiichi
    Faculty of Science and Engineering, Konan Univ.

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Other Title
  • 手取層群の分布域東部（富山・岐阜県境）の層序の再検討と神通層群（新称）の提案
  • テドリソウグン ノ ブンプイキ トウブ(トヤマ ・ ギフ ケンザカイ)ノ ソウ ジョ ノ サイケントウ ト ジンズウソウグン(シンショウ)ノ テイアン

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Abstract

We re-examined upper Mesozoic deposits around the border between Gifu and Toyama prefectures, central Japan, to resolve controversy regarding their stratigraphy. The deposits are divided into the Tetori Group and the overlaying the Jinzu Group (new lithostratigraphic unit). The Tetori Group includes marine deposits bearing Jurassic ammonites, whereas the Jinzu Group consists of terrestrial deposits. The Tetori Group is divided into the Magawa Formation and the conformably overlying Arimine and its stratigraphic equivalent, the Kiritani Formtion. The Jinzu Group, from bottom to top, is divided into the Ioridanitoge, Inotani and Shiroiwagawa Formations. The geological map of the area is revised to show the distribution of these six formations. The Tetori Group is assigned an age of Callovian to early Kimmeridgian based on ammonites, and the Inotani Formation of Jinzu Group is assigned an age of Aptian to Albian based on zircon-fission track dating with best-fit peak ages of 102.6 (−6.1, +6.5) , 111.6 (−6.2, +6.6), 112.5 (−11.0, +11.7) and 121.0 (−12.1, +11.7) . The Jinzu Group in the Jinzu Section in the eastern part of its distribution, is suggested to be Aptian and Albian, but the Tetori Group in the Hakusan Section in the western part of its distribution is suggested to be Bathonian to Barremian. Therefore, the Jinzu and Tetori Groups were probably deposited at different times.

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