南部北上帯母体‐長坂地域の脆性せん断帯  兵士沢せん断帯の例

書誌事項

タイトル別名
  • A cataclastic shear zone in the Motai-Nagasaka area, Southern Kitakami Belt -An example of the Tsuwamono-zawa shear zone.
  • ナンブ キタカミタイ モタイ ナガサカ チイキ ノ ゼイセイセンダンタイ ツワモノザワ センダンタイ ノ レイ

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抄録

A NNE-trending, sinistral cataclastic shear zone-the Tsuwamono-zawa shear zone-was described in the Motai-Nagasaka area in the southwestern part of the Southern Kitakami Belt. The Tsuwamono-zawa shear zone bounds the Motai Metamorphic Rocks and the basement amphibolites of the Southern Kitakami Belt along the type route of the shear zone, where the transition of deformation structures across a 50-m-wide cataclastic shear zone was described in detail. The grain-size distribution of the cataclasite from the amphibolites along the above shear zone obeys a power-law equation with the fractal dimension Dd of 1.8. The Tsuwamono-zawa shear zone, which cuts a limb of a Valanginian fold and has been intruded by Early Cretaceous granite, must have been active in Early Cretaceous time almost concurrently with the Hizume-Kesennuma Fault. The southwestern part of the Southern Kitakami Belt must have also been subjected to the Early Cretaceous sinistral shear movement that formed the Hizume-Kesennuma Fault.

収録刊行物

  • 地質学雑誌

    地質学雑誌 106 (10), 659-669, 2000

    一般社団法人 日本地質学会

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