岐阜県美濃テレーン上麻生ユニットの礫岩に含まれるチャート岩体から産出したペルム紀放散虫化石

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  • 伊藤 剛
    中国科学院南京地質古生物研究所 現所属：産業技術総合研究所地質調査総合センター
  • 北川 祐介
    新潟大学大学院自然科学研究科 現所属：三菱マテリアルテクノ株式会社
  • 松岡 篤
    新潟大学理学部地質科学科

書誌事項

タイトル別名
  • Middle and Late Permian radiolarians from chert blocks within conglomerates of the Kamiaso Unit of the Mino terrane in Gifu Prefecture, central Japan
  • ギフケン ミノ テレーン ジョウ アソウ ユニット ノ レキガン ニ フクマレル チャートガンタイ カラ サンシュツ シタ ペルムキ ホウサンチュウ カセキ

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抄録

Middle and Late Permian (Capitanian and Changhsingian) radiolarians were obtained from chert blocks located within conglomerates of the Kamiaso Unit of the Mino terrane along Tsubogawa River, Gifu Prefecture, Central Japan. Previously, the Capitanian and Changhsingian cherts have not been reported from the sequences of the Akiyoshi terrane. Therefore, the collected chert blocks were not derived from the Akiyoshi terrane. The Capitanian and Changhsingian cherts have been recovered from the Permian sequences of Jurassic accretionary complexes in Southwest Japan; however, the characteristics of the Permian radiolarian fauna of the chert blocks are inconsistent with those from previously recovered Permian cherts. This indicates that the chert blocks were not derived from previously known units including Permian sequences. A previous study suggested that Triassic-Jurassic chert clasts within the chert breccias of the Kamiaso Unit were derived from the accreted Kamiaso Unit on the landward trench slope. As the Permian chert has not been identified in the coherent facies of the Kamiaso Unit, the Permian sequences must have been subducted during accretion. Our results suggest that the chert blocks were derived from the pre-accretion Kamiaso Unit located on the outer trench slope.

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  • 地質学雑誌

    地質学雑誌 122 (6), 249-259, 2016-06-15

    一般社団法人 日本地質学会

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