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2007 Fiscal Year Final Research Report Summary

Magnetostratigraphic study on post-Miocene transitions in the uplift-erosion processes, climate and biota in Nepal Himalaya

Research Project

Project/Area Number 17540427
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

GAUTAM Pitambar  Hokkaido University, Faculty of Science, Assoc. Prof. (60374203)

Co-Investigator(Kenkyū-buntansha) SAKAI Tetsuya  Shimane Univ., Interdisc. Fac. Sci. & Eng., Assoc. Prof. (90303809)
Project Period (FY) 2005 – 2007
KeywordsNepal / Siwalik group / Miocene / Magnetostratigraphy / Kathmandu Valley / Tectonics / Magnetic susceptiblity / Sedimentology
Research Abstract

New magnetic and sedimentological data from Nepalese Subhimalayan and Kathmandu Valley sediments obtained in this project provide following valuable geoscientific/environmental information:
1. Magnetic polarity data for 8 up to 5km thick Siwalik sediment sections, including Tinau Khola North studied anew, over 600 km length of the Sub Himalaya firmly bracket the sediment deposition age from >16 to 1 myr ago. Sediment accumulation rate ranged from 25 to 65 cm/kyr with two peaks during 10.9-9.7 and 5.2-3.6 myr ago; the former likey to be a combined response of multiple causal phenomena such as uplift of Higher Himalayan Crystallines, elevated mountain erosion/denudation, and effects marked by initiation of flood-flow dominated meandering system in the foreland basin, basin subsidence, etc. triggered by advent of summer monsoon. A consistent W-E to NW-SE magnetic lineation in fine-grained sediments records weak deformation induced by mild N-S or NNE-SSW directed compression and serves as a … More paleostress proxy.
2. In Kathmandu Valley, reversal stratigraphy in Lukundol section reveals sediment deposition during 1.1-0.7 myr ago and gives evidence for massive deposition of gravel at ca. 0.96 myr ago coinciding with uplift of Mahabharat range that now forms the southern valley wall. New data from the basin's north bracket the age of Gokarna Formation at Dhapasi to ca. 45-34 kyr ago supported by Laschamp reversal event near the base of Dhapasi section. Laser granulometry of fine-grained prodelta deposits-indicators of calm subaqueous deposition suggests bi- to trimodal distribution for the silt to silty sand deposits indicative of a mixed sediment provenance or post-depositional sediment mixing.
3. Magnetic susceptibility serves as a practical tool for mapping the Lesser Himalayan formations, rapid lithological correlation of the adjacent sections and deciphering the cyclic deposition in Kathmandu basin, and also quantification of paleo- and present- day environmental pollution (e.g. due to vehicular traffic). Less

  • Research Products

    (20 results)

All 2009 2008 2007 2006 2005

All Journal Article (10 results) (of which Peer Reviewed: 5 results) Presentation (10 results)

  • [Journal Article] Assessment of traffic-induced environmental pollution : Magnetic properties and heavy metal chemistry of dusts on streets and leaves from Kathmandu, Nepal2009

    • Author(s)
      Gautam P.
    • Journal Title

      Journal of Nepal Geological Society 39(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Magnetism and granulometry of Pleistocene sediments of Dhapasi section, Kathmandu Valley (Nepal) : implications for depositional age and past environment2009

    • Author(s)
      Gautam P.
    • Journal Title

      Bulletin of Dept. Geology, Tribhuvan University 12(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Assessment of traffic-induced environmental pollution: Magnetic properties and heavy metal chemistry of dusts on streets and leaves from Kathmandu, Nepal.2009

    • Author(s)
      Gautam P.
    • Journal Title

      Journal of Nepal Geological Society 39 (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Magnetism and granulometry of Pleistocene sediments of Dhapasi section, Kathmandu Valley (Nepal): implications for depositional age and past environment.2009

    • Author(s)
      Gautam P.
    • Journal Title

      Bulletin of Dept. Geology, Tribhuvan University 12 (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Magnetic fabric of Siwalik sediments (Nepal) : implications to time-space evolution of stress field2008

    • Author(s)
      Gautam P.
    • Journal Title

      Journal of Nepal Geological Society 38

      Pages: 39-48

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Magnetic fabric of Siwalik sediments (Nepal): implications to time-space evolution of stress field.2008

    • Author(s)
      Gautam P.
    • Journal Title

      Journal of Nepal Geological Society 38

      Pages: 39-48

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] The lacustrine section at Lukundol, Kathmandu basin, Nepal : Dating andmagnetic fabric aspects2007

    • Author(s)
      Goddu S. R.
    • Journal Title

      Journal of Asian Earth Sciences 30(1)

      Pages: 73-81

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] The lacustrine section at Lukundol, Kathmandu basin, Nepal: Dating and magnetic fabric aspects.2007

    • Author(s)
      Goddu S. R.
    • Journal Title

      Journal of Asian Earth Sciences 30(1)

      Pages: 73-81

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Integration of Magnetism and heavy metal chemistry of soils to quantify the environmental pollution in Kathmandu, Nepal2005

    • Author(s)
      Gautam P.
    • Journal Title

      The Island Arc 14 (4)

      Pages: 424-434

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Integration of magnetism and heavy metal chemistry of soils to quantify the environmental pollution in Kathmandu, Nepal.2005

    • Author(s)
      Gautam P.
    • Journal Title

      The Island Arc 14(4)

      Pages: 424-434

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] On the use of magnetic susceptibility for characterization of rocks (Himalaya) and soils (Hokkaido)2009

    • Author(s)
      Gautam P.
    • Organizer
      FY2008 Presentation Meeting of Museum Researchers
    • Place of Presentation
      Sapporo, Japan
    • Year and Date
      2009-02-19
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] On the use of magnetic susceptibility for characterization of rocks (Himalaya) and soils (Hokkaido).2009

    • Author(s)
      Gautam, P.
    • Organizer
      FY2008 Presentation Meeting of Museum Researchers
    • Place of Presentation
      Sapporo
    • Year and Date
      2009-02-19
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Rockmagnetic characteristics of the Kathmandu Valley sediments : Potential for correlation and paleoenvironmental reconstruction2007

    • Author(s)
      Gautam P.
    • Organizer
      Japan Geosciences Union Annual Congress 2007
    • Place of Presentation
      Chiba City, Japan
    • Year and Date
      2007-05-21
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Rockmagnetic characteristics of the Kathmandu Valley sediments: Potential for correlation and paleoenvironmental reconstruction.2007

    • Author(s)
      Gautam, P.
    • Organizer
      Japan geosciences Union Annual Congress 2007
    • Place of Presentation
      Chiba City, Japan
    • Year and Date
      2007-05-21
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Geological and magnetostratigraphic aspects of the Siwaliks and pre-Siwaliks (including the Gondwanas) in the southern margin of the Nepal Himalaya2007

    • Author(s)
      Gautam P.
    • Organizer
      International Symposium of the Hokkaido University Museum : Gondowana Research
    • Place of Presentation
      Sapporo, Japan
    • Year and Date
      2007-05-10
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Geological and magnetostratigraphic aspects of the Siwaliks and pre-Siwaliks (including the Gondwanas) in the southern margin of the Nepal Himalaya.2007

    • Author(s)
      Gautam, P.
    • Organizer
      International Symposium of the Hokkaido University Museum: Gondowana Research
    • Place of Presentation
      Sapporo, Japan
    • Year and Date
      2007-05-10
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Magnetostratigraphic and magnetic fabric records in the Himalayan foreland basin sediments (c. 16-1 Ma)of Nepal2006

    • Author(s)
      Gautam P.
    • Organizer
      International Workshop on Paleo, Rock and Environmental Magnetism
    • Place of Presentation
      Kochi Core Center, Kochi University, Nankoku City
    • Year and Date
      2006-12-20
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Magnetostratigraphic and magnetic fabric records in the Himalayan foreland basin sediments (c. 16-1 Ma) of Nepal.2006

    • Author(s)
      Gautam, P.
    • Organizer
      International Workshop on Paleo, Rock and Environmental Magnetism
    • Place of Presentation
      Kochi Core Center, Kochi University, Nankoku City.
    • Year and Date
      2006-12-20
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Magnetic fabric in the Siwalik foreland basin in Nepal and its implications to the time-space evolution of the stress field2006

    • Author(s)
      Gautam P.
    • Organizer
      International Workshop on Seismology, Seismotectonics and Seismic Hazard in the Himalayan region
    • Place of Presentation
      Kathmandu, Nepal
    • Year and Date
      2006-11-28
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Magnetic fabric in the Siwalik foreland basin in Nepal and its implications to the time-space evolution of the stress field.2006

    • Author(s)
      Gautam, P.
    • Organizer
      International Workshop on Seismology, Seismotectonics and Seismic Hazard in the Himalayan region
    • Place of Presentation
      Kathmandu, Nepal.
    • Year and Date
      2006-11-28
    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2010-06-09   Modified: 2021-04-07  

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