Phosphate minerals in chert from Toyoda, Kochi, City, Japan. .

DOI

Bibliographic Information

Other Title
  • 高知市豊田産チャート中の燐酸塩鉱物

Abstract

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+.

Journal

Details 詳細情報について

  • CRID
    1390282681211914752
  • NII Article ID
    130003728562
  • DOI
    10.2465/ganko.83.141
  • ISSN
    18813275
    09149783
  • Text Lang
    en
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

Report a problem

Back to top