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Structural Profile and Development of the Accretionary Complex in the Nankai Trough, Southwest Japan: Results of Submersible Studies

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Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin

Part of the book series: Modern Approaches in Solid Earth Sciences ((MASE,volume 8))

Abstract

We conducted seafloor geological mapping using the submersible “SHINKAI 6500” along the Shionomisaki submarine canyon, off Kii peninsula, Southwest Japan, in order to document the distribution of outcrop-scale structures and strain in the accretionary complex of the Nankai trough. We investigated outcrops in the seaward-most part (frontal thrust zone), the landward-most part (megasplay fault zone) and an intermediate part (imbricate thrust zone) of the accretionary complex. Turbiditic sediments in the frontal thrust zone have been deformed to form an open anticline. Minor normal faults striking parallel to the trough axis developed in the crest of the anticline. As sediments were transferred into the imbricate thrust zone, both hill-size open anticlines and outcrop-scale open to tight folds developed in the turbiditic sequence. We also observed brittle thrust faults spatially associated with tight folds and development of shear fabrics such as oblique cleavages and en-echelon mineral veins. An out-of-sequence thrust, known as the megasplay fault in this region, then developed in the frontal part of the landward-most ridge composed of thick turbidite sequences. Sandstones just above the megasplay fault are cemented by carbonates. Behind the cemented zone, bifurcations of the megasplay fault are distributed in the sandstone-rich strata dipping steeply to the south. Folds with wavelength of ∼200 m developed in mudstone-rich turbidites behind the bifurcating fault zone. The cementation strengthened the frontal part of the megasplay fault zone, which in turn, acted as an indenter for the inner part of the accretionary wedge. The cemented and hardened ridge must have local controls on strain localization and development of the accretionary complex.

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Acknowledgements

Our thanks go to the captain and crew of the R/V Yokosuka, and the commander and pilots of the “SHINKAI 6500” operation team. Our thanks also go to the Shipboard Science Parties of YK99-09, YK00-08, YK05-08 and YK06-02 cruises for their assistance and discussion. We appreciate the support of JAMSTEC during this study. We thank to Prof. Timothy Kusky (China University of Geosciences) and Dr. Andrea Festa (University of Torino) for their critical reviews and constructive comments.

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Authors and Affiliations

  1. Graduate School of Life and Environmental Sciences, University of Tsukuba, Ten-nodai 1-1-1, Tsukuba, Ibaraki, 305-8572, Japan

    Ryo Anma

  2. The University of Tsukuba, 1-127-2-C-740 Yokodai, Tsukubamirai, 300-2358, Japan (home)

    Yujiro Ogawa

  3. School of Ocean and Earth Science and Technology (SOEST), University of Hawaii at Manoa, Honolulu, HI, 96822, USA

    Gregory F. Moore

  4. Fukada Geological Institute, 2-13-12 Hon-Komagome, Bunkyo, Tokyo, 113-0021, Japan

    Kiichiro Kawamura

  5. Marine Geology, Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa-shi, Chiba, 277-8564, Japan

    Tomoyuki Sasaki

  6. Earth-Appraisal Co. Ltd., Chiyoda, Tokyo, 101-0063, Japan

    Shunsuke Kawakami

  7. Department of Geology, Miami University, 114 Shider Hall, Oxford, OH, 45056, USA

    Yildirim Dilek

  8. Japan Nuclear Energy Safety Organization, Toranomon 4-3-20, Tokyo, 105-0001, Japan

    Yoko Michiguchi

  9. INPEX Corporation, Akasaka Biz Tower 5-3-1 Akasaka, Minato-ku, Tokyo, 107-6332, Japan

    Ryota Endo

  10. Graduate School of Life and Environmental Sciences, University of Tsukuba, Ten-nodai 1-1-1, Ibaraki, 305-8572, Japan

    Shunji Akaiwa

  11. Marine Works Japan, Showa-machi 3175-25, Kanazawa, Yokohama, 236-0001, Japan

    Satoshi Hirano

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  1. Ryo Anma
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Correspondence to Ryo Anma .

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Editors and Affiliations

  1. Obari, Century Tsukuba-Miraidaira C-740, Yokodai 1-127-2, Tsukubamirai-shi, 300-2358, Japan

    Yujiro Ogawa

  2. Graduate School of Life &, Environmental Sciences, University of Tsukuba, Ten-nodai 1-1-1, Tsukuba, Ibaraki, 305-8572, Japan

    Ryo Anma

  3. Dept. Geology, Miami University, Shideler Hall 114, Oxford, 45056, Ohio, USA

    Yildirim Dilek

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Anma, R. et al. (2011). Structural Profile and Development of the Accretionary Complex in the Nankai Trough, Southwest Japan: Results of Submersible Studies. In: Ogawa, Y., Anma, R., Dilek, Y. (eds) Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin. Modern Approaches in Solid Earth Sciences, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-8885-7_8

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