縁海周辺のいくつかの中新世から第四紀にかけての火成岩類の地球科学--西南日本,島根県東部および隠岐島前からの例〔英文〕 Geochemistry of Some Miocene to Quaternary Igneous Rocks Bordering an Ensialic Marginal Basin - An Example from Eastern Shimane Prefecture and Oki Dozen Island, Southwest Japan

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Major element oxide analyses of Miocene to Quaternary igneous rocks from eastern Shimane Prefecture and Oki Dozen Island show that although arc-related volcanism is dominant in this area, alkaline and tholeiitic rocks are also widespread.13; The oldest samples (Dolerites and Omori Formation) are a suite of tholeiitic to mildly calc-alkaline eruptives and intrusives, the latter mutually related by low-pressure fractional crystallization. Younger rocks of the Matsue Formation are alkaline to transitional basalts, some containing conspicuous biotite, with accordingly high K_2O/Na_2O, Volcanic rocks of Oki Dozen Island are an alkali basalt-trachyte suite, related by low-pressure fractionation. The lowermost Pliocene Wakurayama Andesite is succeeded by alkaline to transitional basalts sampled from south of Yasugi City and from Daikon Jima Island.13; The oldest tholeiitic rocks coincide with opening of the Japan Sea, and their chemistry is comparable with that from the initial magmatic stages of other ensialic marginal basins. Younger rocks have source regions variably contaminated either by fluids derived from the downgoing oceanic crust beneath the area, or result from hybridisation of magma with the overlying mantle wedge.

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  • 島根大学理学部紀要

    島根大学理学部紀要 (20), p115-133, 1986-12

    島根大学理学部

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各種コード

  • NII論文ID(NAID)
    110000993434
  • NII書誌ID(NCID)
    AN00108106
  • 本文言語コード
    JPN
  • 資料種別
    Departmental Bulletin Paper
  • 雑誌種別
    大学紀要
  • ISSN
    03879925
  • NDL 記事登録ID
    3140143
  • NDL 刊行物分類
    ME41(火山・岩石)
  • NDL 雑誌分類
    ZM2(科学技術--科学技術一般--大学・研究所・学会紀要)
  • NDL 請求記号
    Z14-380
  • データ提供元
    CJP引用  NDL  NII-ELS  IR 
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