Calcium distribution in alkali feldspar of a quartz syenite from Cape Ashizuri, Shikoku, southwest Japan

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著者

    • NAKANO Satoshi
    • Department of Natural Science, Faculty of Education, Shiga University
    • AKAI Junji
    • Department of Earth Sciences, Faculty of Science, Niigata University

抄録

Alkali feldspar grains in a quartz syenite from Cape Ashizuri, southwest Japan, consist of two parts: clear and turbid. The rims of grains are turbid and show lamellar textures of microperthites. Both clear and turbid parts are scattered irregularly inside grains. The clear parts are optically featureless and cryptoperthitic. The inner turbid parts are mosaic and lamellar microperthites. In some sections, only lamellar microperthites are developed throughout a grain. Calcium distribution maps were obtained for feldspar grains showing the above textures. The rims are always poor in calcium (nearly 0 mol% An). The inner clear parts are generally rich in calcium (5 mol% An at the maximum) around the composition of about Or<SUB>33</SUB>Ab<SUB>64</SUB>An<SUB>3</SUB>, but in some cases poor in calcium (-0.1mol% An). The sodium-rich phase of the microperthite of the inner turbid parts are variable in calcium content from 7 to nearly 0 mol% An. On the other hand, the potassium-rich phase of the microperthite is always poor in calcium both in the rims and inside the grains. The total calcium distribution patterns suggest a possible calcium transfer from the inside to the outside of grains under hydrother-mal conditions with microperthite formation.

収録刊行物

  • Mineralogical journal

    Mineralogical journal 19(2), 75-86, 1997-04-01

    Japan Association of Mineralogical Sciences

参考文献:  21件中 1-21件 を表示

被引用文献:  2件中 1-2件 を表示

各種コード

  • NII論文ID(NAID)
    10008772893
  • NII書誌ID(NCID)
    AA00739590
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    05442540
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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