高知市豊田産チャート中の燐酸塩鉱物

DOI

書誌事項

タイトル別名
  • Phosphate minerals in chert from Toyoda, Kochi, City, Japan. .

抄録

Wavellite, variscite, planerite and cacoxenite were found in chert from Toyoda, Kochi City, as the first occurrence of aluminum phosphate assemblage in sedimentary rocks in Japan. They were formed on walls of fractures therein under a near surface condition. The phosphate ion came from nearby fluorapatite seam after the decomposition by sulphuric acid generated from pyrite in the intercalated slate after oxidation.<br> The chemical analyses of wavellite, variscite, planerite and cacoxenite indicate wavellite to be a high fluorine material, variscite to be a nearly ideal one, planerite to be a copper-bearing one, and cacoxenite to be a highly aluminian material, respectively. The X-ray powder studies on variscite and fluorapatite specify the former to be Messbach-type and the latter to be very close to end member. Under such a near surface condition, different geochemical behaviours of Al from Fell leads to the formation of aluminum phosphates without any essential Fe3+.

収録刊行物

  • 岩鉱

    岩鉱 83 (4), 141-149, 1988

    一般社団法人　日本鉱物科学会

詳細情報 詳細情報について

  • CRID
    1390282681211914752
  • NII論文ID
    130003728562
  • DOI
    10.2465/ganko.83.141
  • ISSN
    18813275
    09149783
  • 本文言語コード
    en
  • 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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