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Laterization Process of Ultramafic Rocks in Siruka, Solomon Islands

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type:Technical Report

Silica and magnesia in the bed rock and the saprolitic zones have been removed and only the residual elements (iron, chromium, aluminium, manganese, cobalt and nickel) remain in the limonitic zone. These elements are relatively concentrated by the removal of the soluble elements. However, nickel becomes unstable and is leached towards the lower part of the profile and concentrated at the saprolitic zone. Nickel is combined with silica and magnesia, as lizardite or mixed gels (garnierite nickel ore) at the weathering front. Significant supergene nickel enrichment occurring in the decomposed zone, indicating that water had percolated downward to a very low water table at depth during the wearhering process. Cobalt and manganese are concentrated in the limonitic part of the profiles (~3-6m depth) of which are poorly protected against erosion and mechanical transportation. The behavior of nickel is contradictory to that of cobalt and manganese and its relative mobility is a little higher than them. It is leached out of contradictory to that of cobalt and manganese and its relative mobility is a little higher than them. It is leached out of the limonitic concretions, where it id first concentrated with Co and Mn, and largely migrates to the bottom part of the profiles. The structure and mineralogy of the weathering profile indicate environmental conditions likely to have been dominated by alternating wet and dry periods.

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詳細情報

  • CRID
    1050282810883976832
  • ISSN
    1884-6300
  • Web Site
    http://hdl.handle.net/2324/19004
  • 本文言語コード
    en
  • 資料種別
    departmental bulletin paper
  • データソース種別
    • IRDB
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