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Behavior of trace elements concentrated at grain-boundaries during partial melting of Peridotites

Research Project

Project/Area Number 63460053
Research Category

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

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

Principal Investigator

SUZUKI Kazuhiro  Nagoya University, School of Science, Associate Professor, 理学部, 助教授 (90111624)

Co-Investigator(Kenkyū-buntansha) ENAMI Masaki  Nagoya University, School of Science, Assistant Professor, 理学部, 助手 (20168793)
SUWA Kanenori  Nagoya University, School of Science, Professor, 理学部, 教授 (70022564)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥8,200,000 (Direct Cost: ¥8,200,000)
KeywordsGrain-boundary / Magma / Partial melting / Trace element / Peridotite / Basalt / Incompatible element / 希土類元素 / チタナイト
Research Abstract

The distribution of the incompatible elements in mantle peridotites was examined by means of electron microprobe analysis, water leaching and in situ partial melting to explain the contents of potash and other incompatible elements in basaltic magmas. The mineral chemistry can hardly account for the chemistry of the parental peridotites. The enrichment of incompatible elements along grainboundaries is confirmed by the EPMA step analysis across boundaries of the constituent minerals. The boundary enrichment is demonstrated also by the EPMA analysis of the surfaces of the constituents before and after acid washing. AIKbeta emission spectrum of the surfaces suggests that atoms on mineral surfaces are less tightly bonded with surrounding atoms than those in minerals. ahd hence they are leached out easily. To estimate the amount of incompatible elements stored on the surfaces, elements were leached out through repeated washing of samples with deionized water at 20, 75 and 160゚C and the leac … More hing solutions were analyzed with an ion chromatographic analyzer. The accumulated amount of leached elements tends to become almost constant at each temperature, but increases with increase in temperature. The potash leached out from 1g sample at 160゚C amounts to 63.3-255mug, about 40-80 % of the whole-rock abundance. Thus, we find that most of the unaccountable elements in peridotites is stored on the grain-boundaries. The grain-boundary enrichment of potash and other incompatible elements should be particularly important in partial melting of peridotites. To examine this, chips of peridotites were heated at 1100-1370゚C in a gas-mixing furnace. Glass veins, 3-30 mum in width, are formed along grain-boundaries of the constituents at every temperatures. Glass makes up 4-8 vol.
% at 1300゚C, and shows a basaltic composition. This result leads us to a conclusion that the abundance of incompatible elements in the melt at the small degree of melting is governed mainly by the grain-boundaries, because the grain-boundaries can melt first. The present study demonstrates that basaltic magmas can be generated from kaersutite- and/or phlogopite-free mantle peridotites. Less

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 飯山敏道: "変成過程における物質移動実験および理論的研究" [地球内部に於ける物質移動と変化]・岩鉱特別号. 4号. 199-208 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] OHTANI,Eiji: "Structural change of albite(NaAlSi_3O_8)melt quenched at high pressure:density and AlKβ X-ray emission." Jour.Min.Pet.Econ.Geol.(Ganko Gakkisi). 11. 385-390 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SUZUKI,Kazuhiro: "Partial melting at grain-boundaries of constituent minerals in some mantle peridotites." Structural development of the Japanese islamds[Origin of continental crust(granitic layer)],DELP Publication. 28号. 126-128 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SUZUKI Kazuhiro: "Possible effects of grain-boundary REE on the REE distribution in derivative melts at partial melting" Geochem.J.(in submitted).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] ENAMI Masaki: "Quartz pseudomorphs after coesite in eclogites from Shandong province,east China" Am.Mineral.(in press). 75. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Iiyama, J.T. ( Suzuki, K., Akaogi, M., Nishiyama, T., Fujimoto, K. and Kato, Y.): "Material transfer during metamorphic process: Experimental approaches." Dynamic processes of material transport and transformation in the earth's interior, No. 4, 199-208, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Ohtani, E. ( and Suzuki, K ): "Structural change of albite (NaAlSi308) melt quenched at high pressure: density and AlKbeta X-ray emission." Min. Pet. Econ. Geol. (Gannko Gakkaisi), Vol. 11, 385-390, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Suzuki, K. ( Mouri, K. & Mizuhara, K ): "Partial melting at grain-boundaries of constituent minerals in some mantle peridotites." Structural development of the Japanese islands [Origin of continental crust (granitic layer)], DELP Publication, No. 28, 126-128, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Suzuki, K. ( Adachi, M. & Yamamoto, K ): "Possible effects of grain-boundary REE on the REE distribution in derivative melts at partial melting." Geochem. J.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Enami, M. ( and Zang, K ): "Quartz pseudomorphs after coesite in eclogites from Shandong province, east China." Am. Mineral., Vol. 75.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 飯山敏道: "変成過程における物質移動実験および理論的研究" 〔地球内部に於ける物質移動と変化〕・岩鉱特別号.4号. 199-208 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] OHTANI,Eiji: "Structural change of albite(NaAlSi_3O_8)melt quenched at high pressure:density and AlKβ X-ray emission." Jour.Min.Pet.Econ.Geol.(Ganko Gakkisi). 11. 385-390 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] SUZUKI,Kazuhiro: "Partial melting at grain-boundaries of constituent minerals in some mantle peridotites." Stuctural development of the Japanese islamds〔Origin of continental crust(granitic layer)〕,DELP Publication. 28号. 126-128 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] SUZUKI,Kazuhiro: "Possible effects of grain-boundary REE on the REE distribution in derivative melts at partial melting" Geochem.

    • Related Report
      1989 Annual Research Report
  • [Publications] ENAMI,Masaki: "Quartz preudomorphs after coesite in eclogites from Shandong province,east China" Am.Mineral.75. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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