長野県野母半島沖海底堆積物および古第三系侍石層中の海緑石

概要

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Two kinds of glauconite grains, one (G-A) in the recent marine sediment off the coast of Nomo Peninsula and the other (G-B) in the Paleogene Saburaishi formation, have been investigated by means of x-ray diffraction method, differential thermal analysis and chemical analysis. Both glauconite grains have been found to consist essentially of randomly interstratified mica and montmorillonite; these minerals are glauconite sensu lato. G-A contains from 45 to 85 per cent montmorillonite layers and its fine grain part is rather rich in montmorillonite layers. G-B also contains 20 per cent montmorillonite layers. Chemical formulae of the glauconites are as follows : G-A-2 (50 per cent montmorillonite layers ) (K_<0.41>Na_<0.17>1/2Ca_<0.02>)_<0.60>(Fe^<3+>_<0.93>Al_<0.59>Mg_<0.58>Fe^<2+>_<0.07>)_<2.17>(Si_<3.55>Al_<0.45>)_<4.00>O_<10>(OH)_2 G-B(20 per cent montmorillonite layers) (K_<0.59>Na_<027>1/2Ca_<0.02>)_<0.33>(Al_<0.86>Fe^<3+>_<0.76>Mg_<0.30>Fe^<2+>_<0.08>)_<2.00>(Si_<3.50>Al_<0.50>)_<4.00>O_<10>(OH)_2 In relation to the degree of crystallinity, proportion of montmorillonite layers, microscopic texture and sssociated minerals, the genesis of glauconite has been discussed.
日本粘土学会の論文
1971-06-05