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Process of magma channel formation in the upper mantle

Research Project

Project/Area Number 12640462
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

NIIDA Kiyoaki  Hokkaido Univ., Graduate School of Sci., Asso. Prof., 大学院・理学研究科, 助教授 (30111149)

Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥2,800,000 (Direct Cost: ¥2,800,000)
Keywordsupper mantle peridotite / magma channel / basaltic primary magma / dunite / chromitite / harzburgite / Iherzolite / ophiolite / スピネル
Research Abstract

Traces of channels formed by high temperature magma channeling through the upper mantle can be recognized in peridotites derived from the upper mantle. Dunite dykes in orogenic Iherzolites and discordant dunite-chromitite associations in ophiolitic peridotites are representative samples of magma channels formed in the upper mantle.
Mode of occurrence of channels, structures and textures of rocks, and the constituent minerals ware examined on the channel samples from the Iwanai-dake peridotite and the Horoman peridotite complexes in Hokkaido, together with those from the Fethiye ophiolite of SW Turkey and the Malakand ophiolite of Northern Pakistan. The sampling were performed as a systematic one across the magma channels to detect the effect of the channeling magma/peridotite wall interactions. The major constituent minerals such as olivine, orthopyroxene, clinopyroxene, and spinel, were analyzed by EPMA for major elements and also by LA-ICPMS for trace elements to detect the melt components and to characterize the type of the channeled magmas.
The dunite-chromitite channels from the Iwanai-dake peridotite complex are characterized by minerals with extremely high Mg# and Cr# signatures, suggesting a high-Mg andesite or a baninite magma for the magma type of the channel formation. The dunite enveloping the chromitite layer can be explained as replasive dunite formed by a melt/wall peridotite interaction during the magma channeling in the wall harzburgite. A number of dunite dykes were found as magma channel swarm in the host harzburgite and Iherzolite in the Horoman peridotite complex. Several kinds of magma types such as MORB-type basalt and a more refractory basalt were detected for magmas channeled in the Horoman peridotites.

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 富士原 敏也: "伊豆・小笠原弧,孀婦岩構造線周辺の潜航調査"JAMSTECしんかい研究. 18. 71-82 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 新井田 清信: "大町海山の蛇紋岩-伊豆・小笠原弧の基盤リソスフェアの性質-"JAMSTECしんかい研究. 19. 77-86 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 新井田 清信: "北海道中軸帯南部の東西地質断面「穂別-岩知志-幌尻岳」"穂別町立博物館研究報告. 17. 1-10 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Fujiwara, T., et al.: "Submersible study around the Sofugan Tectonic Line, Izu-Bonin Arc."JAMSTEC Journal of Deep Sea Research. 18. 71-82 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Niida, K., et al.: "Serpentinites from Ohmachi Seamount : Origin of basement lithosphere of the Izu-Ogasawara Arc."JAMSTEC Journal of Deep Sea Research. 19. 77-86 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Niida, K.: "Geological cross-section 'Hobetsu-Iwachishi-Poroshiridake' across the southern-axial zone of Hokkaido"Bulletin of the Hobetsu Museum. 17. 1-11 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 新井田 清信: "大町海山の蛇紋岩-伊豆・小笠原弧の基盤リソスフェアの性質-"JAMSTEC しんかい研究. 19. 77-86 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Ueda, H., Kawamura, M.and Niida, K: "Accretion and tectonic erosion processes revealed by the mode of occurrence and geochemistry of greenstones in the Cretaceous accretionary complexes of the Idonnappu Zone, southern central Hokkaido, Japan"The Island Arc. 9. 237-257 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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