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Volume 56 Supplement 12

Special Issue: Slip and Flow Processes in and below the Seismogenic Region (2)

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Occurrence of mylonite zones and pseudotachylyte veins around the base of the upper crust: An example from the southern Hidaka metamorphic belt, Samani area, Hokkaido, Japan

Earth, Planets and Space volume 56, pages 1217–1223 (2004)Cite this article

Abstract

Geological studies on exhumed pseudotachylyte-bearing mylonite zones in S-type tonalite were carried out in the southern Hidaka metamorphic belt, Hokkaido, Japan. Mylonitization is characterized by (1) development of composite planar fabrics, (2) grain size reduction, and (3) change in modal composition an increase in mica content and a decrease in quartz content from protolith to mylonite. Mylonite zones are heterogeneously concentrated in the host rocks. At microscopic scales, shear deformation is concentrated heterogeneously in finegrained layers along C-surfaces. Most of the pseudotachylyte layers are subparallel to the C-surface, and tend to overprint thick mylonite zones. The heterogeneous development of mylonite zones, which may be activated as layers of co-seismic slip, should be incorporated into numerical modeling of seismogenic zones.

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Authors and Affiliations

  1. Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo, 113-0033, Japan

    Koji Shimada & Hidemi Tanaka

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

    Tsuyoshi Toyoshima

  3. Japan Oil Development Co. Ltd., Shinkawa, Tokyo, 114-0033, Japan

    Tomohiro Obara

  4. Horonobe Underground Research Center, Japan Nuclear Cycle, Development Institute, Horonobe, Hokkaido, 098-3297, Japan

    Tadafumi Niizato

Authors
  1. Koji Shimada
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  2. Hidemi Tanaka
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  3. Tsuyoshi Toyoshima
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  4. Tomohiro Obara
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  5. Tadafumi Niizato
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Correspondence to Koji Shimada.

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Shimada, K., Tanaka, H., Toyoshima, T. et al. Occurrence of mylonite zones and pseudotachylyte veins around the base of the upper crust: An example from the southern Hidaka metamorphic belt, Samani area, Hokkaido, Japan. Earth Planet Sp 56, 1217–1223 (2004). https://doi.org/10.1186/BF03353343

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  • DOI: https://doi.org/10.1186/BF03353343

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