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Diffusion in sulfide minerals and its application to ore deposits

Research Project

Project/Area Number 61540596
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 鉱物学(含岩石・鉱床学)
Research InstitutionKumamoto University

Principal Investigator

OZAKI Masaharu (1987-1988)  Department of Geology, Kumamoto University, 理学部, 助教授 (50040118)

水田 敏夫 (1986)  熊本大, 理学部, 助手 (80094051)

Co-Investigator(Kenkyū-buntansha) MIZUTA Toshio  Department of Geology, Kumamoto University, 理学部, 助手 (80094051)
尾崎 正陽  熊本大学, 理学部, 助教授 (50040118)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1987: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1986: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordssulfide mineral / sphalerite / diffusion / tracer / transition element / 硫黄分圧 / bementite / Mn-clinopyroxene / tephroite / トレーサー / 炭酸塩鉱物 / 珪酸塩鉱物 / 角閃石 / 単斜輝石 / 苦灰質岩 / 分配 / 鉱床 / 鉄 / 亜鉛 / ラジオアイソトープ
Research Abstract

DIFFUSION IN SULFIDE MINERALS AND ITS APPLICATION TO ONEDEPOSITS
Diffusion coefficients for transition elements in natural sphalerite were determined experimentally as a function of temperature and aS_2 using radioacive ^<54>Mn, ^<59>Fe, ^<60>Co, ^<63>Ni and ^<65>Zn. The tracer was deposited on a polished surface of natural sphalerite as a 1 1 drop of aqueous chloride solution. The doped sphalerite was then heated in sealed silica tubes together with an iron and/or synthesized pyrrhotite and/or pyrite aS2 buller, The tracer distribution was determined by measuring and emissions of powder sampled from successive 4 - 8 m thick layers of the sphalerite chip. Results of diffusivity measurements are as follows.
1.Logarithms of diffusion rates for ^<59>Fe(D_<Fe> cm^2s^<-1>) normal to the cleavage (110) under Fe-FeS aS_2 buffer are -11.0 0.3 at 800゜C and -11.7 0.2 at 700゜C. Log(D_<Co>) are -10.7 0.2 and -11.5 0.3, respecively. Log(D_Zn_< cm^2s^<-1>) normal to the cleavage (110) under Fe-FeS aS_<2> buffer are -10.9 0.2 at 800゜C and -11.8 0.3 at 700゜C. Log(D<_Ni>) are -10.9 0.3 and -12.0 0.3, respectively.
2. The dependence of ^<59>Fe diffusivity on aS_2 is clearly observed in the 800゜C and 700゜C experiments. ^<59>Fe diffusion rates are lower at higher aS_2 conditions (aS_2=10^<-2.9>, Fe_<1-x^S-S_<liq>. buffer; D_<Fe>=10^<-11.0 0.3> at 800゜C) and higher at lower aS_<2>(aS_<2> = 10^<-9.0>, Fe-FeS buffer; D<_Fe> = 10^<-11.3 0.2> at 800゜C).
3. Diffusion rates for ^<60>Co parallel to the (110) plane of sphalerite at 800゜C approximately twice that normal to (110). Sphalerites from metamorphosed Besshi-type deposits in Japan have different element abundances but are characterized by a distinct lack of compositional zoning. It is suggested that sphalerites were homogenized by diffusion processes during regional metamorphism. Calculated annealing times are 16 m.y. at 350゜C and 240 m.y. at 300゜C, assuming 1 millimeter mean displacement of zinc atoms in sphalerite.

Report

(3 results)
  • 1988 Final Research Report Summary
  • 1987 Annual Research Report
  • 1986 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] MIZUTA,Toshio.: Econ.Geol.83. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] MIZUTA,Toshio.: Econ.Geol.83. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] MIZUTA,Toshio.: Mining Geol.38. (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 尾崎正陽: 鉱物学雑誌. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 尾崎正陽・合原憲一: 鉱物学雑誌. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] MIZUTA, Tshio.: "Cation diffusion in sphalerite I: Interdiffusion rate of zinc and iron in natural sphalerite." Econ. Geol.83. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] MIZUTA, Tshio.: "Cation diffusion in sphalerite II: Estimation of exsolution speed of chalcopyrite and pyrrhotite in sphalerite." Econ. Geol.83. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] MIZUTA, Tshio.: "Compositional homogenization of sphalerite by post-depositional diffusion processes in ores from some metamorphosed Besshi-type ore deposits in Japan." Mining Geol.38. (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] OZAKI, Masaharu.: "Study of the thermal transitions of bementite." Jour. Min. Soc. Japan. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] OZAKI, Masaharu; GOHARA, Kanichi.: "Study on chlorite/smectite intersratified minerals from the Hacchobaru geothermal area." Jour. Min. Soc. Japan. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] MIZUTA, Toshio: Econ. Geol.83. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] MIZUTA, Toshio: Econ. Geol.83. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] MIZUTA, Toshio: Mining Geol.38. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] Mizuta,T.: Econ.Geol.82. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] Mizuta,T.: Econ.Geol.82. (1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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