北海道, 神居古潭構造帯北部, 音威子府西方域に分布する蛇紋岩メランジェと蛇紋石鉱物 The serpentinite melange and serpentine minerals in the western Otoineppu area of the northern Kamuikotan tectonic belt, Hokkaido

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著者

    • 大場 点 OBA Tomoru
    • 千葉大学理学部地学教室 Department of Geology and Petrology, Faculty of Science, Chiba University

抄録

Serpentinite melange in the western Otoineppu area, northern Kamuikotan tectonic belt, which is mostly surrounded by the Early Cretaceous Sorachi Group Greenstones, contains many metamorphosed tectonic blocks. The blocks are 1) basic meta-volcanic rocks with well preserved original texture, 2) epidote amphibolite with well-zoned epidote, and 3) very weakly metamorphosed hornblende gabbro. The chemical compositions of relic clinopyroxene in the Upper Sorachi Greenstones and in the hornblende gabbro blocks suggest an orogenic belt origin whereas the chemistry of the Lower Sorachi Greenstones is similar to that of abyssal tholeiites.<br>     Judging from bulk chemistry, the serpentinite has derived mostly from harzburgite. Antigorite is the only serpentine mineral recognized in the serpentinites of the study area. Three types of serpentinite are discriminated; type A with fine grained antigorite with mesh structure occures, type B with coarse grained flake-shaped antigorite, and type C with coarse grained sutured antigorite.<br>     Texturally type A serpentinite is transposed to type B and then to type C. Antigorite with mesh structure contains higher H<sub>2</sub>O than serpentinite of type B and C. Type C serpentinite is rich in Al<sub>2</sub>O<sub>3</sub> and poor in MgO. The three types of serpentinites and mixed-type serpentinite have been separately mapped.

収録刊行物

  • 岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology  

    岩鉱 : 岩石鉱物鉱床学会誌 : journal of mineralogy, petrology and economic geology 90(7), 234-246, 1995-07-05 

    Japan Association of Mineralogical Sciences

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各種コード

  • NII論文ID(NAID)
    10002029352
  • NII書誌ID(NCID)
    AN10047992
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09149783
  • NDL 記事登録ID
    3624145
  • NDL 刊行物分類
    ME51;ME41
  • NDL 雑誌分類
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL 請求記号
    Z15-71
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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