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Alteration and weartering processes in the early terrestrial crust

Research Project

Project/Area Number 08454152
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 InstitutionThe University of Tokyo

Principal Investigator

TAGAI Tokuhei  Univ.of Tokyo, Graduate School of Sci., Assoc.Prof., 大学院・理学系研究科, 助教授 (40011738)

Co-Investigator(Kenkyū-buntansha) NAKASHIMA Satoru  Univ.of Tokyo, Graduate School of Sci., Assoc.Prof., 大学院・理学系研究科, 助教授 (80237255)
MURAKAMI Takashi  Univ.of Tokyo, Graduate School of Sci., Assoc.Prof., 大学院・理学系研究科, 助教授 (00253295)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥800,000 (Direct Cost: ¥800,000)
KeywordsPlagioclase / Archean / Alteration / Weathering / Microtexture / Pyroxene / Olivine
Research Abstract

The materials of the terrestrial crust have contineously been weathered and altered by water since its formation. These phenomena are the most characteristic features of material evolution on the earth in the present solar system. However, the process of the weathering/alteration can not easily be traced because of the following volcanic, tectonic activities on the earth. We can see some products of the proteozoic alteration/weathering activities in the archean anorthosite complex in Superior Province, Canada. In order to simulate the proteozoic environment, we carried out the dissolution experiments on the single crystals of olivine, pyroxene and plagioclase, where the oriented thin specimens were used. Changing the experimental conditions (temperature, ph, time and orientation), the dissolution rate was measured and the surface of the reacted crystal was precisely observed. It can be concluded that the microtextures such as twinning or cleavage contribute very much on the dissolution rate and that the anisotropy of the crystal structure plays essential roll on the dissolution process.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (29 results)

All Other

All Publications (29 results)

  • [Publications] T.Hoshi: "TEM investigation of potassium-calcium feldspar inclusions in Boggild plagioclase" Am.Min.82. 1073-1078 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Tagai: "Diffraction characteristics of calcic plagioclases from eucrites,lunar highland and archean anorthosites." Europ.Jour.Min.10. 125-132 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Tagai: "Preparation of porous apatite ceramics with straight through-channels." J.Mater.Sci.(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Kogure: "Direct identification of biotite/vermiculite layers in hydrobiotite using high-resolution TEM" Min.J. 18. 131-137 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Murakami: "Mobility of uranium during weathering." Am.Min.82. 888-899 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Sato: "Iron nodules scavenging uranium from groundwater." Env.Sci.and Tech.31. 2854-2858 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Hoshi, T.Tagai and M.Suzuki: "Investigations on Boggild intergrowth of intermediate plagioclase by high resolution transmission electron microscopy." Zeits.Krist.211. 879-883 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Suzuki, T.Tagai, T.Hoshi and K.Tsukimura: "Dissolution process and rate in feldspar : Effects of crystallographic orientation." Min.J.18. 43-53 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Murakami, T., Isobe, H., Sato, T., Ohnuki, T.: "Weathering of chlorite in a quartz-chlorite schist : I.Mineralogical and chemical changes." Clays and Clay Minerals. 44. 244-256 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Murakami, T., Isobe, H., Ohnuki, T., Sato, T., Yanase, N., Kiyoshige, J.: "Mechanism of saleeite formation at the Koongarra secondary ore deposit." Mat.Res.Soc.Symp.Proc.412. 809-816 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sato, T., Murakami, T., Watanabe, T.: "Change in layr chrge of smectites and smectite layrs in illite/smectite during diagenetic alteration." Clays and Clay Minerals. 44. 460-469 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Kogure, T., Murakami, T.: "Direct identification of biotite/vermiculite layrs in hydrobiotite using high-resolution TEM." Mineralogical Journal. 18. 131-137 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ohnuki, T., Kozai, N., Isobe, H., Murakami, T., Yamamoto, S., Aoki, Y., Naramoto, H.: "Studies on sorption mechanism of europium by apatite using Rutherford backscattering spectroscopy and resonant uncleara reaction analysis." J.Nucl.Sci.Technol.34. 58-62 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Murakami, T., Ohnuki, T., Isobe, H., Sato, T.: "Mobility of uranium during weathering." American Mineralogist. 82. 888-899 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Sto, T., Murakami, T., Yanase, N., Isobe, H., Payne, T.E., Airey, P.L.: "Iron nodules scavenging uranium from groundwater." Enviromental Science and Technology. 31. 2854-2858 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Tagai, T.Hoshi and T.Yamada: "Development of the porous apatitic materials." Journ.Min.Soc.Japan.26. 59-62 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Hoshi and T.Tagai: "TEM investigation of potassium-calcium feldspar inclusions in Boggild plagioclase." Am.Min.82. 1073-1078 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Tagai, T.Hoshi and M.Suzuki: "Diffraction characteristics of calcic plagioclases from eucrites, lunar highland and archean anorthosites." Europ.Jour.Min.10. 125-132 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Hoshi: "TEM investigation of potassium-calcium feldspar inclusions in Boggild plagioclase." Am.Min.82. 1073-1078 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Tagai: "Diffraction characteristics of calcic plagioclases from eucrites,lunar highland and archean anorthosites." Europ.Jour.Min. 10. 125-132 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Tagai: "Preparation of porous apatite ceramics with straight through-channels." J.Mater.Sci.(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Murakami: "Mobility of uranium during weathering." Am.Min.82. 888-899 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Sato: "Iron nodules scavenging uranium from groundwater." Env.Sci.and Tech.31. 2854-2858 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Hoshi: "Investigations on Boggild intergrowth of intermediate plagioclase by high resolution transmission electron microscopy." Zeits.Krist.211. 879-883 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Tagai: "Development of the porous apatitic materials(in press)" Journ.Min.Soc.Japan. 25-4. (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.Suzuki: "Dissolution process and rate in feldspar:Effects of crystallographic orientation." Min.J.18-2. 43-53 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Murakami: "Weathering of chlorite in a guartz-chlorite schist:I.Mineralogical and chemical changes." Clay and Clay minerals. 44. 244-256 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Murakami: "Mechanism of saleeite formation at the Koongara secondary ore deposit." Mat.Res.Soc.Symp.Proc.412. 809-816 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Kogure: "Direct identification of biotite/vermiculite layers in hydrobiotite using highresolution TEM." Min.J.18. 131-137 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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