Thermobaric structure of Himalayan UHP metamorphic belt induced by zircon inclusion method

2009 Fiscal Year Final Research Report

• Project/Area Number: 19540477
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Geology
• Research Institution: Meisei University
• Principal Investigator: KANEKO Yoshiyuki Meisei University, 理工学部, 准教授 (50397080)
• Project Period (FY): 2007 – 2009
• Keywords: ジルコン / ヒマラヤ / 超高圧変成岩 / 顕微ラマン

Research Abstract

Coesite relics were discovered as inclusions in Cpx in eclogite and as inclusions in zircon in felsic and pelitic gneisses from Higher Himalayan Crystalline rocks in upper Kaghan valley, north-west Himalayas. The metamorphic peak conditions of the ultrahigh-pressure (UHP) eclogites are estimated to be 28.6±0.4 kbar and 757-786℃. The Himalayan UHP metamorphic rocks crops out a very thin layer (<100m) sandwiched between overlying and underlying medium to high-pressure metamorphosed units. This imply that the very thin UHP layer moved up from the mantle depth (95-120km) to the mid-crustal level (30-40km), then stopped and thermally altered the surrounding the Higher Himalayan Crystalline rocks.

Research Products

• [Journal Article] Blueschists, eclogite, and subduction zone tectonics : Insights from a review of Late Miocene blueschists and eclogites, and related young high-pressure metamorphic rocks. (2010)
  • Author(s): Ota, T. Kaneko, Y.
  • Journal Title: Gondwana Research 18 Pages: 167-188
  • Peer Reviewed
• [Journal Article] On-going orogeny in the outer-arc of Timor-Tanimber region, eastern Indonesia. (2007)
  • Author(s): Kaneko, Y., Maruyama, S., Kadarsman, A., Ota, T., Ishikawa, M., Tujimori, J., Ishikawa, A., Okamoto, A.
  • Journal Title: Gondwana Research. 11 Pages: 218-233
  • Peer Reviewed
• [Journal Article] Multiple generations of forearc mafic-ultramafic rocks in the Timor-Tanimbar ophiolite, eastern Indonesia. (2007)
  • Author(s): Ishikawa, A., Kaneko, Y., Kadarusman, A., Ota, T.
  • Journal Title: Gondwana Research 11 Pages: 200-217
  • Peer Reviewed
• [Journal Article] Thermobaric structure of the Himalayan Metamorphic Belt in Kaghan Valley, Pakistan. (2007)
  • Author(s): Rehman H.U., Yamamoto, H., Kaneko Y., Kausar A.B., Murata, M., Ozawa, H.
  • Journal Title: Journal of Asian Earth Sciences 29 Pages: 390-406
  • Peer Reviewed
• [Presentation] Ongoing collision-type orogeny in Timor-Tanimbar island chain, eastern Indonesia. (2010)
  • Author(s): Kaneko Y.
  • Organizer: 2010 Western Pacific Geophysical Meeting
  • Place of Presentation: Taipei, Taiwan(招待講演)
  • Year and Date: 2010-06-24