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1994 Fiscal Year Final Research Report Summary

OXIDATION AND DEHYDROGENATION PROCESSES FOR AMPHIBOLES

Research Project

Project/Area Number 04640743
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 InstitutionKYUSHU UNIVERSITY

Principal Investigator

ISHIDA Kiyotaka  GRADUATE SCHOOL OF SOCIAL AND CULTURAL STUDIES,KYUSHU UNIVERSITY,ASSOCIATE PROFESSOR, 大学院・比較社会文化研究科, 助教授 (60108602)

Co-Investigator(Kenkyū-buntansha) ISHIDA Kiyotaka  
Project Period (FY) 1992 – 1994
KeywordsAmphibole / Oxidation / Dehydogenation / Mossbauer spectra / Infrared spectra / X-ray diffraction pattern(XRD) / Intracrystalline equilibrium
Research Abstract

The oxidation and dehydrogenation processes for amphibole-group minerals were investigated using the Mossbauer, infrared and XRD methods.The series of amphiboles studied were : (1) Fe-Mg-Mn amphiboles of holmquistite, anthophyllite, cummingtonite-grunerite, tirodite-dannemorite, (2) Ca-amphiboles of tremolite-ferroactinolite, hornblende-ferropargasite, (3) Na-Ca amphiboles of manganoan richterite, and (4) alkali amphiboles of magnesioarfvedsonite and the glaucophane-riebeckite series. Although there are many series in the amphibole-group minerals, the oxidation and dehydrogenation processes occur in similar ways :
(1) At temperatures ranging from 350゚C to 650゚C,Fe^<2+> ion in the M1 and M3 sites are oxidized, yielding Fe^<3+> one electron. A proton from the (OH)^- is liberated, and combines with the electron, forming a hydrogen atom.
(2) In Fe^<2+>-poor amphiboles, some Fe^<2+> ions in the M2 and M4 sites migrate to the M1 and M3 sites, and then are oxidized in a similar way. Residing Fe^<2+> in the M2 and M4 sites are also oxidized by the breaking of the (Mg・Mg・Mg/Fe^<3+>)-(OH)to(Mg・Mg・Mg/Fe^<3+>)-0, liberating an electron or decomposing the amphibole structure.
(3) When some Fe^<2+> still remain (in the case of ferro-actinolite), this iron is oxidized by the breaking down of the amphibole structure at higher temperatures, leaving oxide minerals and quartz.

  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 石田清隆: "Infrared spectra of natural and hydrothermally-treated Fe-Mg-Mn amphidoles" 九州大学教養部地学研究報告. 30. 1-19 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田清隆: "Chemical composition,Mossbauer and infrared spectra of calcic amphiboles" 九州大学教養部地学研究報告. 30. 21-37 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田清隆: "Cation site-occupancies and infrared spectra for Na-Ca and alkali amphiboles in manganese ore deposits from Japan and India" 九州大学比較社会文化、紀要. 1. 87-96 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田清隆: "Chemical compositions coexisting amphiboles,clinopyroxenes and pyroxenoids in manganese ore deposits from Japan and India" 九州大学比較社会文化、紀要. 2(予定). (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田清隆・進野 勇・赤坂正秀: "Cation disordering in heat-treated anthophyllites through oxidation and dehydrogenation" 予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田清隆: "Infrared,Mossbauer and XRD studies of heat-treated Ca amphiboles" 予定.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KIYOTAKA ISHIDA: "INFRARED SPECTRA OF NATURAL AND HYDROTHERMALLY-TREATED FE-MG-MN AMPHIBOLES" REP.EARTH SCI.COLL.GEN.EDUC., KYUSHU UNIV.NO.30. 1-19 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] KIYOTAKA ISHIDA: "CHEMICAL AOMPOSITION,M*SSBAUER AND INFRARED SPECTRA OF CALCIC AMPHIBOLES" REP.EARTH SCI.COLL.GEN.EDUC., KYUSHU UNIV.NO.30. 21-37 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] KIYOTAKA ISHIDA: "CATION SITE-OCCUPANCIES AND INFRARED SPECTRA FOR NA-CA AND ALKALI AMPHIBOLES IN MANGANESE ORE DEPOSITS FROM JAPAN AND INDIA" BULL.GRAD.SCHOOL SOC.CUL.STUD., KYUSHU UNIV.1. 87-96 (1995)

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

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Published: 1999-03-09  

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