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2004 Fiscal Year Final Research Report Summary

Leading research of supercritical metamorphic fluids

Research Project

Project/Area Number 14340158
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

HIROI Yoshikuni  Chiba Univ., Science, Professor, 理学部, 教授 (40019427)

Co-Investigator(Kenkyū-buntansha) INOUE Atsuyiki  Chiba Univ., Science, Professor, 理学部, 教授 (30150072)
KANAGAWA Kyuichi  Chiba Univ., Science, Professor, 理学部, 教授 (40185898)
TSUKUI Masashi  Chiba Univ., Science, Assoc.Professor, 理学部, 助教授 (50192191)
FURUKAWA Noboru  Chiba Univ., Science, Research Associat, 理学部, 助手 (40251194)
Project Period (FY) 2002 – 2004
Keywordsregional metamorphic rocks / high temperature / transportation media / corundum / quartz / Al_2SiO_5 minerals / partial melting / diffusivity
Research Abstract

High-temperature and/or high-pressure regional metamorphic rocks have been regarded as the rocks most close to chemical equilibrium. During the research of this program, however, we have successfully discovered theoretically unexpected features not only in high-temperature (granulite-facies) regional metamorphic rocks from Sri Lanka and East Antarctica but also in high-pressure (elcogite-facies) regional metamorphic rocks from China. They are the formation of corundum (Al_2O_3) after pre-existing Al_2SiO_5 minerals (sillimanite in the high-temperature case and kyanite in the high-pressure case, respectively) in the vicinity of quartz (SiO_2) with intervening thin films of feldspar (less than c. 0.1 mm in thickness). The supercritical fluids are the most effective media of transportation of heat and material and, therefore, would prevent such reactions to form corundum after Al_2SiO_5 minerals in the presence of quartz, because the corundum+quartz assemblage is unstable compared with Al_2SiO_5s minerals in the crust and upper mantle. If, however, partial melting takes place in the rocks by the infiltration of H_2O-rich supercritical fluids along fructures, a chance to form corundum after Al_2SiO_5 minerals would happen, because both SiO_2 and Al_2O_3 do not diffuse rapidly in silicate melts formed around quartz. Thus rocks are separated into two portions, SiO_2-saturated and SiO_2-undersaturated.
We performed experiments of partial melting of high-temperature coarse-grained pelitic rocks in the presence of H_2O-rich supercritical fluids to confirm the inferred formation of steep compositional gradients in the melts surrounding relict quartz grains. Thus, the role of H_2O-rich supercritical fluids during regional metamorphism has been revealed to be distinctly different under the subsolidus and "above-solidus" conditions.
In addition, the duration of high-temperature conditions is estimated by the diffusion models of SiO_2 in melts.

  • Research Products

    (12 results)

All 2005 2004

All Journal Article (12 results)

  • [Journal Article] Determination of defect structures in kaolin minerals by high-resolution transmission electron microscopy(HRTEM)2005

    • Author(s)
      Kogure, T., Inoue, A.
    • Journal Title

      American Mineralogist 90巻

      Pages: 85-89

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Determination of defect structures in kaolin minerals by high-resolution transmission electron microscopy (HRTEM)2005

    • Author(s)
      Kogure, T., Inoue, A.
    • Journal Title

      American Mineralogist 90

      Pages: 85-89

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] ザクロ石のインクルージョンおよび組成累帯構造に基づく阿武隈変成岩の温度-圧力径路2004

    • Author(s)
      廣井美邦
    • Journal Title

      地学雑誌 113巻

      Pages: 703-714

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Illite-smectite mixed-layer minerals in felsic volcaniclastic rocks from drill cores, Kakkonda, Japan2004

    • Author(s)
      Inoue, A., Meunier, A., Beaufort, D.
    • Journal Title

      Clays and Clay Minerals 52巻

      Pages: 66-84

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 高塩濃度,高アルカリ環境における粘土鉱物の生成と変化-放射性廃棄物地層処分環境におけるベントナイト緩衝材の変質に関連して-2004

    • Author(s)
      井上厚行
    • Journal Title

      粘土科学 43巻

      Pages: 145-161

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Development of shape- and lattice-preferred orientations of amphibole grains during initial cataclastic deformation and subsequent deformation by dissolution-precipitation creep in amphibolites from the Ryoke metamorphic belt, SW Japan2004

    • Author(s)
      Imon, R., Okudaira, T., Kanagawa, K.
    • Journal Title

      Journal of Structural Geology 26巻

      Pages: 793-805

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 石灰質ナンノ化石Florisphaera profundaとDiscoaster属の結晶方位解析-微小藻類が作る炭酸カルシウム殻の結晶構造とその意味-2004

    • Author(s)
      亀尾浩司, 古川登
    • Journal Title

      化石 76巻

      Pages: 23-31

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] P-T path of Abukuma metamorphic rocks inferred from inclusions and compositional zoning of garnet2004

    • Author(s)
      Hiroi, Y.
    • Journal Title

      Journal of Geography 113

      Pages: 703-714

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Illite-smectite mixed-layer minerals in felsic volcaniclastic rocks from drill cores, Kakkonda, Japan2004

    • Author(s)
      Inoue, A., Meunier, A., Beaufort, D.
    • Journal Title

      Clays and Clay Minerals 52

      Pages: 66-84

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Formation and transformation of clay Minerals under saline, alkaline conditions-A review in special reference to reactions of bentonite and cement pore fluids in high-level radioactive waste repository2004

    • Author(s)
      Inoue, A.
    • Journal Title

      Journal of the clay science society of Japan 43

      Pages: 145-161

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Development of shape-and lattice-preferred orientation sof amphibole grains during initial cataclastic deformation and subsequent deformation by dissolution-precipitation creep in amphibolites from the Ryoke metamorphic belt, SW Japan2004

    • Author(s)
      Imon, R., Okudaira, T., Kanagawa, K.
    • Journal Title

      Journal of Structural Geology 26

      Pages: 793-805

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Analysis of crystallographic directions of calcareous microfossils produced by the past tiny phytoplankton-crystalline nature of some calcareous nannofossil species, Florisphaera profunda and discoasters, and its meaning2004

    • Author(s)
      Kameo, K., Furukawa, N.
    • Journal Title

      Fossil 76

      Pages: 23-31

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2006-07-11  

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