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Genetical research on alkali rocks acoompanied with skarn

Research Project

Project/Area Number 05453007
Research Category

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

Allocation TypeSingle-year Grants
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionOkayama University

Principal Investigator

KUSACHI Isao  Okayama University, Faculty of Education, Assistant Professor, 教育学部, 助教授 (10032773)

Co-Investigator(Kenkyū-buntansha) HENMI Chiyoko  Okayama University, Faculty of Science, Assistant Professor, 理学部, 助教授 (80124791)
MATSUDA Toshihiko  Okayama University, Faculty of Science, Assistant Professor, 理学部, 助教授 (10033359)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1994: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1993: ¥6,700,000 (Direct Cost: ¥6,700,000)
KeywordsAlkali rock / Quartz monzonite / Skarn / Crystalline limestone / Gehlenite / Spurrite / Diffusion / 石灰岩 / イオン半径
Research Abstract

The present study aims at clayfing the genesis of alkali rocks accompanied with skarns, which are formed as high-temperature metasomatic products at Fuka, Okayama Prefecture and Kushiro, Hiroshima Prefecture.
1. Occurrence of alkali rocks : In the two districts, many quartz monzonite dikes occur in limestones. Skam minerals are primarity formed on both side of the dikes, and show a zonal arrangement : (quartz monzonite) - (gehlenite zone) - (spurrte zone) - (crystaline limestone). The alkali rocks occur along the boundary between quartz monzonite and gehlenite zone, and are always accompained with granet and vesuvianite sub-zones.
2. Transfer of elements during the skarn formation : The elements are supplied from quartz monzonite. The distance of movement of each elment is related to its ionic radii. The small ions as Si move up to 20 meters, and the lager ions as Na moveless. It is clear that the elements are moved by the diffusion mechanism.
3. Chemical features of alkali rocks : The Al_2O_3 contents are almost the same as those of quartz monzonite. Gains (+) and losses (-) during the change in alkali rocks from quartz monzonite, assuming constant aluminum (g/100cm^3) , are as follows ; SiO_2 : -36--60, Na_2O : -2, K_2O : -5, FeO^* : -3.9-20.5, MgO : 3-17, CaO : 9-30g/100cm^3, La : -3.5-2.2, Ce : 5.1--2.0, Pr : -0.4-0.2.Nd : -0.5-0.5, Ba : 87, Li : 33, Sr : 69, V : 66, Zn : 81, Zr : 28mg/100cm^3 mg/100cm^3.
4. Formation of alkali rocks : Much silica, 52g/100cm^3 on an average, leached from Quartz monzonite, and reacted to the gehlenite zone. As a consequence, quartz monzonite magma was deficient in silica. It is very likely that the alkali rocks was formed by desilication of quartz monzonite.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Kusachi,I. and Henmi,C.: "Nifontovite and olshanskyite from Fuka,Okayama Prefecture, Japan." Mineralogical.Magazine.58. 279-284 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kusachi,I.,Henmi,C. and Kobayashi,S.: "Chemicalcomposition of bakerite from Fuka,Okayama Prefecture, Japan." Mineralogical.Joumal.17. 111-117 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Henmi,C.,Kusachi,I. and Henmi,K.: "Morimotoite,Ca_3TiFe^<2+>Si_3O_<12>,anew titanian garnet fromFuka,OkayamaPrefecture, Japan." Mineralogical.Magazine.59. 115-120 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 草地功、逸見千代子: "スカルンに伴うアルカリ岩の成因的研究(発表予定)" 岩石鉱物鉱床学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kusachi, I.and Henmi.C.: "Nifontovie and olshanskyite from Fuka, Okayama Prefecture, Japan." Mineralogical.Magazine.58. 279-284 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kusachi, I., Henmi, C.and Kobayashi, S.: "Chemical composition of bakerite from Fuka, Okayama Prefecture, Japan." Mineralogical.Journal.17. 111-117 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Henmi.C., Kusachi, I.and Henmi, K.: "Morimotoite, Ca_3TiFe^<2+>Si_3O_<12>, a new titanian gamet from Fuka, Okayama Prefecture, Japan." Mineralogical.Magazine.59. 115-120 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kusachi, I., Henmi.C.: "Cenetical resarch on alkali rocks accompanied with skarn (plan) ." The Japanese Association of Mineralogists, Petrologists and Economic Geologists.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Kusachi,I.and Henmi,C.: "Nifontovite and olshanskyite from Fuka,Okayama Prefecture,Japan." Mineralogical.Magazine.58. 279-284 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Kusachi,I.and Henmi,C.and Kobayashi,S.: "Chemical composition of bakerite from Fuka,Okayama Prefecture,Japan." Mineralogical.Joumal.17. 111-117 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Henmi,C.,Kusachi,I.and Henmi,K.: "Morimotoite,Ca_3TiFe^<2+>Si_3O_<12>,a new titanian garnet from Fuka,Okayama Prefecture,Japan." Mineralogical.Magazine.59. 115-120 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] 草地 功,逸見 千代子: "スカルンに伴うアルカリ岩の成因的研究(発表予定)" 岩石鉱物鉱床学会誌.

    • Related Report
      1994 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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