花崗岩に伴われる閃長岩の2.3のタイプ(I)

DOI

書誌事項

タイトル別名
  • On some types of syenite in granitic rocks (I)

説明

Some types of syenite are found in granitic rocks in southwestern Japan. They are devided into four types, A, B, B', and C, according to the combination of principal minerals. Type A is potash-syenite, bearing hornblende or biotite as principal minerals. Type B is composed mainly of pyroxene, hornblende, andradite, and albite with often relict of potash-feldspar, while principal minerals in B are epidote, albite and potash-feldspar. Type C is characterized by epidote, chlorite, albite and/or potash-feldspar.<br> By field occurence and textural relation, the genesis of these syenites can be attributed to the metasomatic acition of alkali-emanation, eliminated as volatile vapor from the deeper granitic magmas. So, Type C might be produced either in shallower regions or in lower temperatures in deuteric stage, than A and B. Type A and C can be found in normal granitic rocks, but the source of emanation in B might be more alkaline magma which represent the more advanced stage of granitic evolution, as thought in replacement pegmatite. The relationship in four rock types is shown in Figure 8.

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詳細情報 詳細情報について

  • CRID
    1390001206216657408
  • NII論文ID
    130003883799
  • DOI
    10.2465/ganko1941.42.309
  • ISSN
    18830765
    00214825
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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