変成岩岩石学的手法による岩石の部分融解の研究 Investigation into Partial Melting of Rocks by Means of Metamorphic Petrology

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Recent discussions on partial melting in high-grade metamorphic rocks are briefly reviewed. Garnets in high-grade pelitic rocks commonly contain euhedral calcic plagioclase inclusions. In addition, they display compositional growth zoning for phosphorus as well as major elements (Fe, Mn, Mg and Ca) and other minor elements (<I>e.g</I>., Y), though modified to various degrees by volume diffusion. The phosphorus zonation is defined by a low-P core with a distinct high-P rim, and correlates with the presence or absence of euhedral calcic plagioclase inclusions. Apatite, xenotime and other phosphate minerals as well as K-feldspar are present in the rock matrix and as inclusions in the garnet rim, whereas these minerals are usually absent in the garnet core. This suggests phosphate undersaturation during the growth of the core. All these features are satisfactorily explained by the following partial melting reaction.<BR>Biotite + sillimanite + sodic plagioclase + K-feldspar + quartz + phosphates (+H<SUB>2</SUB>O) <BR>=granitic melt +garnet core+calcic plagioclase+rutile (or ilmenite).<BR>The garnet rim and the rock matrix may have formed from the granitic melt upon cooling.<BR>These data would be a new indicator for previous partial melting of pelitic gneisses and granulites.

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  • 地學雜誌  

    地學雜誌 106(5), 707-713, 1997-10-25 

    Tokyo Geographical Society

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各種コード

  • NII論文ID(NAID)
    10002236685
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    4322565
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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