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Relationship between the deformation textures and the AMS fabric of accretionary complex : An example from the Shimamoto Belt, Kochi, Japan.

Research Project

Project/Area Number 16540417
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionKyoto University

Principal Investigator

TSUTSUMI Akito  Kyoto University, Graduate School of Science, Assistant Professor, 大学院理学研究科, 助手 (90324607)

Co-Investigator(Kenkyū-buntansha) ISHIKAWA Naoto  Kyoto University, Graduate School of Human and Environmental Studies, Associate Professor, 大学院人間・環境学研究科, 助教授 (30202964)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsAMS / Anisotropy of magnetic susceptibility / Shimanto belt / accretionary complex / 変形実験
Research Abstract

AMS (Anisotropy of magnetic susceptibility) fabric has attracted much attention recently for a method of deformation analysis of sedimentary rocks from the accretionary complexes. In this study, AMS fabrics were measured in the Shimanto area from the northern cretaceous units and the southern Tertiary units in Shikoku, and the strain of the sedimentary complexes was examined by the AMS data.
The AMS-fabrics of the coherent sandstone and mudstone in the Susaki formation at Ryu-misaki located in the east end of Yokonami peninsula were measures as a representative example for AMS-fabric of non-deformed rocks. Results showed that the characteristic AMS ellipsoids of undeformed sedimentary fabric have oblate component with minimum AMS axes oriented perpendicular to the bedding plane. In the Muroto formation, slaty cleavages are developed in the coherent mudstone as a distinct deformation fabric. The measured AMS ellipsoid in this area have oblate shapes. The minimum AMS axes are slightly shi … More fted to the poles of the slaty cleavage plane from the poles of the bedding plane. This AMS-fabric may be affected by the deformation correlated with the development of cleavage planes. Strain analysis was tried at every point where orientations of cleavage planes and bedding planes were measured. As for strain markers for the analysis, 11 to 15 AMS ellipsoids were obtained at every point. In the analysis, one of the principal directions of the strain ellipsoid was assumed to be the direction to the poles of the slaty cleavage planes. The calculated strain ellipsoids have oblate shape suggesting that the deformation associated with the deformation of AMS ellipsoid was uni-axial shortening. This result is consistent with the result of strain analysis previously reported for different slate areas.
Uni-axial compression experiments of synthetic granular samples showed that the degree of the preferred orientation of grains increased due to grain rotation and this caused increase of the degree of AMS fabric. Less

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (7 results)

All 2007 2006 2005 2004

All Journal Article (7 results)

  • [Journal Article] 蛇紋岩の摩擦と断層の性質について2007

    • Author(s)
      堤 昭人
    • Journal Title

      粘土科学 46・1

      Pages: 24-27

    • NAID

      110006204929

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 京都大学の摩擦・変形・透水試験機2006

    • Author(s)
      嶋本利彦, 堤 昭人 他
    • Journal Title

      構造地質 49

      Pages: 49-71

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 岩石の破壊電磁気現象に関する実験的研究2006

    • Author(s)
      堤 昭人, 白井信正
    • Journal Title

      構造地質 49

      Pages: 77-81

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 変形・透水試験機設計入門2005

    • Author(s)
      堤 昭人, 嶋本利彦
    • Journal Title

      日本地質学会第112年大会見学旅行案内書

      Pages: 153-160

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Deformation structure of the Shimanto accretionary complex and its AMS fabric2004

    • Author(s)
      Yoshida, T., Tsutsumi, A., Ishikawa, N.
    • Journal Title

      Proceedings of the international symposium on Methane Hydrates and Fluid Flow in Upper Accretionary Prisms (PrismFluid 2004)

      Pages: 125-128

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Porosity and permeability structures of the Shimanto accretionary prism, Kochi prefecture, southwest Japan2004

    • Author(s)
      Nishino, S., Tsutsumi, A.
    • Journal Title

      Proceedings of the international symposium on Methane Hydrates and Fluid Flow in Upper Accretionary Prisms (PrismFluid 2004)

      Pages: 8-13

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Frictional properties of rocks at high slip-rate range : effects of normal stress2004

    • Author(s)
      Tsutsumi, A.
    • Journal Title

      Proceedings of the 1st Workshop on IODP physical property measurement

      Pages: 22-23

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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