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Study of crustal-scale bending structures in island arcs

Research Project

Project/Area Number 16540416
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

KANO Ken-ichi  Shizuoka University, Faculty of Science, Professor, 理学部, 教授 (30090517)

Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2006: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordsaccretionary prism / bending structure / Mino Belt / Shimanto Belt / Itoigawa-Shizuoka Tectonic Line / crust of island arc / メガキンク
Research Abstract

1. I examined the bending structures developed in the Jurassic Mino accretionary complex. The main research strata are the Kanayama unit along the Maze and Nagara Rivers, the Funabuseyama unit along the Ibi and Neo Rivers, the Samondake unit in the northern Gujo area and the Kamiasou unit in the Yoro Mountains. The following results are clarified in this study.
The melanges of the Kanayama and Funabuseyama units are mainly of tectonic origin due to subduction of oceanic plate. Extracting effects by the later deformation events, which include the crustal-scale bending, we can estimate the convergent direction of plate during the late Jurassic and the earliest Cretaceous on the basis of melange fabric analysis that shows sinistral oblique subduction.
The Samondake unit have a various scale bending structures due to the stratal rotation about subvertical axis. The NW-SE trending active Hachiman fault is situated on the hinge area of regional scale bending structure, suggesting that the faul … More t was produced in association with the formation of bending structure, and is re-activated during the Quaternary.
The overall N-S trending giant bend in the Kamiasou unit in the Yoro Mountains, that directed almost perpendicular to the trend of Southwest Japan arc, are due to the westward-plunging folds with half-wavelength of > 10km. The origin of this giant bend is still unknown, and further studies on this problem are required.
2. Illite crystallinity (IC) of argillaceous rocks of the accretionary units in the Mino area has been studied to evaluate the physical condition during and after the accretion. The IC values range in higher to middle grade diagenesis except for the Samondake unit which shows middle to lower grade diagenesis. This result suggests that the paleo-geothermal structure of the accretionary complex in the Mino Belt is very monotonous and is not rearranged by the later deformation events which include out-of-sequence thrusting and giant-scale bending are not significant. For the next step to study physical conditions, we successfully analyzed fluid inclusions in quartz veins in the Shimanto Belt of the Akaishi Mountains. This method will be applied in near future to the analysis of melange formation of the Mino accretionary complex and to the faulting conditions along the Itoigawa-Shizuoka Tectonic Line (ISTL).
3. The relationships between the northward bend of the basement rocks in the Akaishi Mountains and the ISTL fault system have been re-evaluated in this study. The precise fabric analyses of ductile deformation structures along the ISTL have revealed that the initial stage of faulting was mainly left-lateral strike slip under the condition of greenschist facies metamorphism. The geophysical researches including seismic reflection study suggest that the bended basement of the Akaishi Mountains and the pre-existing ISTL fault zone thrust onto the Quaternary sediments of the Kofu Basin along the very-low angle active fault system which were formed to the east of the older ISTL. Less

Report

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

    (11 results)

All 2007 2006 2004

All Journal Article (9 results) Book (2 results)

  • [Journal Article] Deformation process and kinematics of melange in the Early Cretaceous accretionary complex of the Mino-Tamba Belt, eastern southwest Japan2007

    • Author(s)
      Akiko Fukui
    • Journal Title

      Tectonics Vol.26,TC2006.doi:10.1029

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Deformation process and kinematics of melange in the Early Cretaceous accretionary complex of the Mino-Tamba Belt, eastern southwest Japan.2007

    • Author(s)
      Fukui, A., Kano, K.
    • Journal Title

      Tectonics, doi : 10,1029/2006TC001945

      Pages: 14-14

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] (eds.), Chubu area.2006

    • Author(s)
      Niitsuma, N. et al.
    • Journal Title

      Geology of Japan, No. 4, Asakura-shoten Co. Ltd., Tokyo

      Pages: 564-564

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 赤石山地四万十帯,上部白亜系犬居メランジュ形成時・形成後の温度圧力条件 : 流体包有物による検討2004

    • Author(s)
      杉山祐規子
    • Journal Title

      静岡大学地球科学研究報告 31

      Pages: 5-12

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 糸魚川・静岡構造線活断層系,下円井断層に伴う粉砕起源のシュードタキライト2004

    • Author(s)
      狩野謙一
    • Journal Title

      地質学雑誌 110・12

      Pages: 779-790

    • NAID

      110003024627

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] P-T conditions of the Upper Cretaceous Inui melange in the Shimanto Belt of the Akaishi Mountains, eastern Southwest Japan : constraints from fluid inclusions.2004

    • Author(s)
      Sugiyama, Y., Kano, K., Satish-Kumar, M.
    • Journal Title

      Geoscience Reports of Shizuoka University 31

      Pages: 5-12

    • NAID

      110007614918

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Pseudotachylytes of crushing origin from the Shimotsuburai fault of the Itoigawa-Shizuoka Tectonic Line active fault system, central Japan.2004

    • Author(s)
      Kano, K., Lin, A.,, Fukui, A., Tanaka, H.
    • Journal Title

      Journal of the Geological Society of Japan 110

      Pages: 779-790

    • NAID

      110003024627

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 糸魚川-静岡構造線活断層系,下円井断層に伴う粉砕起源のシュードタキライト2004

    • Author(s)
      狩野謙一
    • Journal Title

      地質学雑誌 110-12

      Pages: 779-790

    • NAID

      110003024627

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 赤石山地四万十帯犬居メランジュ形成時・形成後の温度圧力条件:流体包有物による検討2004

    • Author(s)
      杉山裕規子
    • Journal Title

      静岡大学地球科学研究報告 31号

      Pages: 5-12

    • Related Report
      2004 Annual Research Report
  • [Book] 日本地方地質誌4「中部地方」2006

    • Author(s)
      新妻信明
    • Total Pages
      564
    • Publisher
      朝倉書店
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Book] 日本地方地質誌4 中部地方2006

    • Author(s)
      新妻 信明
    • Total Pages
      564
    • Publisher
      朝倉書店
    • Related Report
      2005 Annual Research Report

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

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