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Volume 54 Supplement 11

Special Issue: Slip and Flow Processes in and below the Seismogenic Region

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P-T conditions of cataclastic deformation associated with underplating: An example from the Cretaceous Shimanto complex, Kii Peninsula, SW Japan

Earth, Planets and Space volume 54, pages 1133–1138 (2002)Cite this article

Abstract

P-T conditions of cataclastic deformation associated with underplating in subduction zone are estimated from fluid inclusions within the post-mélange veins in the Cretaceous Shimanto Belt, Kii Peninsula, SW Japan. Both cataclasite and post-mélange veins cut the mélange fabric and are distributed along the thrusts in duplex structure. The homogenization temperatures range from 200 (±10)°C to 270 (±42)°C corresponding to entrapment pressures over a wide range from 145 (±5) MPa to 304 (−20) MPa. Our results have important implications in evaluating the relationship between underplating processes by duplexing and coseismic deformation in accretionary complexes.

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Authors and Affiliations

  1. Kochi University, Akebonocho 2-5-1, Kochi, 780-8520, Japan

    Yoshitaka Hashimoto

  2. Waseda University, Nishiwaseda 1-6-1, Sinjuku-ku, Tokyo, 169-8050, Japan

    Mamoru Enjoji

  3. The Institute for Frontier Research of Earth Evolution, JAMSTEC, Yokosuka, 237-0061, Japan

    Arito Sakaguchi & Gaku Kimura

  4. University of Tokyo, Hongo 7-3-1, Tokyo, 113-0033, Japan

    Gaku Kimura

Authors
  1. Yoshitaka Hashimoto
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  2. Mamoru Enjoji
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  3. Arito Sakaguchi
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  4. Gaku Kimura
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Correspondence to Yoshitaka Hashimoto.

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Hashimoto, Y., Enjoji, M., Sakaguchi, A. et al. P-T conditions of cataclastic deformation associated with underplating: An example from the Cretaceous Shimanto complex, Kii Peninsula, SW Japan. Earth Planet Sp 54, 1133–1138 (2002). https://doi.org/10.1186/BF03353314

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  • DOI: https://doi.org/10.1186/BF03353314

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