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Reconstruction of geologic history of Indus suture zone of Ladakh, Indian Himalayas, by high resolution fossil and radiometric ages

Research Project

Project/Area Number 16403008
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Geology
Research InstitutionGifu University

Principal Investigator

KOJIMA Satoru  Gifu Univ., Fac. of Eng., Professor, 工学部, 教授 (20170243)

Co-Investigator(Kenkyū-buntansha) OHTANI Tomoyuki  Gifu Univ., Fac. of Eng., Associate Professor, 工学部, 助教授 (20356645)
ITAYA Tetsumaru  Okayama Univ. of Sci., Open Res. Center, Professor, 自然科学研究所, 教授 (60148682)
EHIRO Masayuki  Tohoku Univ., Museum, Professor, 総合学術博物館, 教授 (10124554)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥9,200,000 (Direct Cost: ¥9,200,000)
Fiscal Year 2006: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2004: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsHimalayan orogen / Indus suture zone / Ladakh / biostratigraphy / radiochronology / structural petrology / continent-continent collision
Research Abstract

Main results of this project are summarized as follows.
1. Late Triassic to Early Cretaceous radiolarians are found from chert clasts in the Hemis Conglomerate (syn-collisional Molasse sequence) along the Indus suture zone. Since the chert is considered to have been part of the ocean-plate cover sediments, these fossil evidence shows the pre-Late Triassic opening of the Ceno-Tethys (pre-Late Triassic rifting of Karakoram block from the northern margin of Gondwana) in Ladakh Himalayas.
2. Shelf-facies marine formations along the Shyok suture zone are subdivided into the Middle Jurassic (Callovian) ammonoids-bearing Soltak Formation and Middle Cretaceous Shyok Formation with Albian Orbitolina. These fossils strongly indicate that the ocean along the Shyok suture was closed in the post-Middle Cretaceous time.
3. Plutonic rocks of the Ladakh arc which were formed by the subduction of oceanic plate of Ceno-Tethys are calc-alkaline on the basis of their mineralogy and geochemistry, and have K-Ar ages of 50-51 Ma. Granite and diorite with calc-alkaline signature and 64-66 K-Ar ages are also distributed on the northern margin of the arc. These lines of evidence clearly show that the arc magmatism had continued at least for sixteen million years during 50-66 Ma before the collision between Eurasia and India.
4. Mylonites along the Karakoram fault have vertical lineation and extensional deformation structures together with the right-lateral strike-slip shear indicators designating same sense as the present-day activity. These structures show a long and complicated deformation history more than fifteen million years until now. Aspect ratios of dynamically recrystallized quartz grains suggest that the width of shear zone has narrowed with the decreasing temperature of the fault zone.

Report

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

    (10 results)

All 2007 2006 2005

All Journal Article (10 results)

  • [Journal Article] Discovery of Jurassic ammonoids from the Shyok suture zone to the northeast of Chang La Pass, Ladakh, northwest India and its tectonic significance2007

    • Author(s)
      Ehiro, M., Kojima, S., Sato, T., Ahmad, T., Ohtani, T.
    • Journal Title

      Island Arc 16

      Pages: 124-132

    • NAID

      10026605377

    • 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] Discovery of Jurassic ammonoids from the Shyok suture zone to the northeast of Chang La Pass, Ladakh, northwest India and its tectonic significance2007

    • Author(s)
      Ehiro M., Kojima S., Sato T., Ahmad T., Ohtani T.
    • Journal Title

      Island Arc vol.16

      Pages: 124-132

    • NAID

      10026605377

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] On Orbitolina (Foraminiferida) from the Shyok suture zone, Ladakh, NW India2006

    • Author(s)
      Matsumaru, K., Ehiro, M., Kojima, S.
    • Journal Title

      Jour. Palaeontol. Soc. India 51

      Pages: 43-49

    • 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] On Orbitolina (Foraminiferida) from the Shyok suture zone, Ladakh, NW India2006

    • Author(s)
      Matsumaru K., Ehiro M., Kojima S.
    • Journal Title

      Jour. Palaeontol. Soc. India vol.51

      Pages: 43-49

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 北インドラダックヒマラヤの地質:インダス累層下部の礫岩中のチャート礫から得られた放散虫2006

    • Author(s)
      小嶋 智
    • Journal Title

      地球惑星科学関連学会2006年合同大会予稿集 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 北インドラダックヒマラヤの地質:カラコルム断層に発達するマイロナイトの変形構造2006

    • Author(s)
      大谷具幸
    • Journal Title

      地球惑星科学関連学会2006年合同大会予稿集 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 北インドラダックヒマラヤの地質:ラダック山地チャン峠東方のシュヨク縫合帯の地質と年代2006

    • Author(s)
      永広昌之
    • Journal Title

      地球惑星科学関連学会2006年合同大会予稿集 (CD-ROM)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 北インドラダックヒマラヤの地質:インダス縫合帯から得られた放散虫2005

    • Author(s)
      小嶋 智, Talat Ahmad, 永広昌之, 大谷具幸
    • Journal Title

      地球惑星科学関連学会2005年合同大会予稿集 CD-ROM

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 北インドラダックヒマラヤの地質:シュヨク縫合帯からジュラ紀アンモノイドの発見とその意義2005

    • Author(s)
      永広昌之, 小嶋 智, Talat Ahmad, 大谷具幸
    • Journal Title

      地球惑星科学関連学会2005年合同大会予稿集 CD-ROM

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 北インドラダックヒマラヤの地質:カラコルム断層マイロナイト帯の変形構造2005

    • Author(s)
      大谷具幸, 小嶋 智, 永広昌之, Talat Ahmad
    • Journal Title

      地球惑星科学関連学会2005年合同大会予稿集 CD-ROM

    • Related Report
      2004 Annual Research Report

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

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