Synnyrites-New Complex Alumina-Potassic Raw Material

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  • PANINA Liya
    Institute of Mineralogy & Petrography, Siberian Branch of Russian Science Academy, Universitetsky pr.
  • SHARYGIN Victor
    Institute of Mineralogy & Petrography, Siberian Branch of Russian Science Academy, Universitetsky pr.
  • PROSHENKIN Igor
    Institute of Mineralogy & Petrography, Siberian Branch of Russian Science Academy, Universitetsky pr.

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Other Title
  • シニーライト―新しいアルミナーカリ原料
  • シニーライト アタラシイ アルミナ カリ ゲンリョウ エイブン

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Abstract

The paper is devoted to synnyrites-a high alumina-potassic (17-21% K2O, 22-24% Al2O3) silicate raw material, the main resources of which are concentrated in Siberia and territorially confined to the Baikal-Amur railway. Synnyrites consist of K-feldspar (65-75 vol.%), kalsilite (15-25%), nepheline (up to 10%) and ferromagnesian minerals (biotite, sometimes, garnet and pyroxene, 1-5%). Kalsilite and K-feldspar are in maximum potassic. Nepheline contains up to 25-35mol.% of kalsilite mineral; mica is to magnesian (100MgO/MgO+FeO>25 mol.%) low-titanian biotite. Garnet corresponds to lowalumina melanite. Pyroxene is a member of isomorphic series of diopside-hedenbergite-aegirine. Salic minerals are mainly present as symplectic intergrowths (dactilotypic, poikilitic, pseudoleucite texture), seldom as individual idiomorphic grains.<BR>Large synnyritiferous plutons were formed in Paleozoic and Mesozoic ages during tectono-magmatic activity of older consolidated blocks of the Earth's crust within Baikal-Stanovoy rifting system where potassic alkaline-basaltoid magmatism is widespread. The plutons are large layered ethmoliths. They are made up of two differentiated series : lower melano-, mesocratic series composed of mica pyroxenites, shonkinites, pulaskites and upper leucocratic series represented by nepheline and pseudoleucite syenites, synnyrites. Synnyrites are mainly concentrated in apical and upper of the layered plutons. From the bottom to the top, of the plutons the amounts of K2O, AL2O3 and SiO2 increase and the ferromangnesian mineral contents decrease in the rocks.<BR>The formation of synnyrite-bearing plutons is the result of slow crystallization of an initial alkaline-basaltoid melt at a substantial depth and widely manifested processes of intrachamber differentiation and fractionation. It is supposed that synnyrites were formed due to segregation of leucite in the top of magmatic chamber and further transformation of leucite into kalsilite and K-feldspar.<BR>A few methods of using and processing synnyrites are suggested : 1) after mechanical enrichment, the ore may be used as chlorine-free low-concentrated potassic fertilizer for a long time ; 2) low-fer-riferous K-feldspar and kalsilite concentrates, potassic alum may be obtained from synnyrites by mechanical enrichment, flotation or acidic decomposition; 3) highconcentrated chlorine-free potassic fertilizers, alumina, fine dispersed silica and others may be produced from synnyrites by deep chemical processing with virtually no wastes.

Journal

  • Shigen-Chishitsu

    Shigen-Chishitsu 45 (252), 223-233, 1995

    The Society of Resource Geology

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