Development of composite planar fabric in mylonites along the Median Tectonic Line, southwest Japan

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    Mylonites along the Median Tectonic Line, southwest Jaspan commonly contain shear bands comprising S(-C)-Ss fabrics. This paper stresses the lithologic control on the orientation, dimension and development of shear bands by comparing the microstructure of the shear bands in different rock types. The generation of the composite planar fabric can be classified into four different strain partitioning models: S only type without any slip surface (model A); S-C type (model B); S-Ss type with Ss-slip precedence (model C), and S-Ss type with S-slip precedence (model D). Model C is proposed in this paper and is similar to the model for the generation of Riedel shears in brittle shear zones. An unstable slip between porphyroclasts and the matrix during ductile flow can easily initiate shear bands. Formation of a composite planar fabric is initiated according to model A, followed by model C in conditions of increasing strain, and then model D when the angle between S and the shear zone boundary becomes small enough to produce S-slip. -from Author

    Original languageEnglish
    Pages (from-to)92-102
    Number of pages11
    JournalIsland Arc
    Volume1
    Issue number1
    Publication statusPublished - 1992

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    tectonics
    shear band
    shear zone
    fabric
    strain partitioning
    microstructure
    matrix
    rock

    ASJC Scopus subject areas

    • Earth and Planetary Sciences (miscellaneous)

    Cite this

    Development of composite planar fabric in mylonites along the Median Tectonic Line, southwest Japan. / Takagi, Hideo.

    In: Island Arc, Vol. 1, No. 1, 1992, p. 92-102.

    Research output: Contribution to journalArticle

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    abstract = "Mylonites along the Median Tectonic Line, southwest Jaspan commonly contain shear bands comprising S(-C)-Ss fabrics. This paper stresses the lithologic control on the orientation, dimension and development of shear bands by comparing the microstructure of the shear bands in different rock types. The generation of the composite planar fabric can be classified into four different strain partitioning models: S only type without any slip surface (model A); S-C type (model B); S-Ss type with Ss-slip precedence (model C), and S-Ss type with S-slip precedence (model D). Model C is proposed in this paper and is similar to the model for the generation of Riedel shears in brittle shear zones. An unstable slip between porphyroclasts and the matrix during ductile flow can easily initiate shear bands. Formation of a composite planar fabric is initiated according to model A, followed by model C in conditions of increasing strain, and then model D when the angle between S and the shear zone boundary becomes small enough to produce S-slip. -from Author",
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