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Imbricate structure of the Permian Yoshii Group in the Otakeyama area, Okayama Prefecture, southwest Japan

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Abstract

The Yoshii Group of the Akiyoshi terrane is distributed over the Otakeyama area, Okayama Prefecture, southwest Japan. The Yoshii Group is composed of siliceous rocks and clastics, comprising chert-clastic sequences. The Yoshii Group is divided into four structural units (Units Ot 1, Ot 2, Ot 3, and Ot 4) in structurally ascending order. Lithological similarities and radiolarian age suggest that these units exhibit almost identical ocean plate stratigraphy. These units are structurally-repeated to form an imbricate structure. This structure was possibly formed by off-scrape accretion at a toe of an accretionary complex. Additionally, a review of previous studies indicates that an imbricate structure is common in the Akiyoshi terrane. The presence of an imbricate structure in the Akiyoshi terrane, Permian accretionary complex, indicates the possibility that a specific horizon of Permian pelagic sequences acted as a décollement zone.

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Authors and Affiliations

  1. State Key Laboratory of Geo-processes and Mineral Resources, China University of Geosciences, Wuhan, 430074, China

    Tsuyoshi Ito

  2. Department of Geology, Faculty of Science, Niigata University, Niigata, 950-2181, Japan

    Atsushi Matsuoka

Authors
  1. Tsuyoshi Ito
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  2. Atsushi Matsuoka
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Correspondence to Tsuyoshi Ito.

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Tsuyoshi Ito is currently a postdoctoral fellow of China University of Geosciences, Wuhan, China. He received his Ph.D. in Science from Niigata University, Japan and China University of Geosciences, Wuhan in 2013. His research interests include Permian paleoceanography and accretionary complex with radiolarian fossils.

Atsushi Matsuoka is a professor in the Department of Geology, Faculty of Science, Niigata University, Japan. He obtained his Ph.D. in Science from Osaka City University in 1986. His major research interests include paleoceanography with radiolarians and ammonoids. He also researches recent radiolarians. Prof. Matsuoka has published over 130 papers.

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Ito, T., Matsuoka, A. Imbricate structure of the Permian Yoshii Group in the Otakeyama area, Okayama Prefecture, southwest Japan. Front. Earth Sci. 9, 152–163 (2015). https://doi.org/10.1007/s11707-014-0443-x

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