花崗岩及び流紋岩の変質作用により生成されたハロイサイトの形状と成因について

概要

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In this study, the shapes of tubular halloysite crystals formed in granitic and rhyolitic rocks by weathering and hydrothermal activities were observed in detail under the transmission electron microscope. Halloysite specimens of weathering origin were collected from remarkably altered parts surrounding core stone and altered granitic and rhyolitic gravels in sediments. The hydrothermal halloysite specimens were collected from hydrothermal clay deposits in granitic and rhyolitic rocks. The difference of shapes (the width and length of crystals) of tubular halloysite was paied special attention. The mean value of width and length of tubular halloysite crystals in a specimen was measured, and slso the value of its standard deviations was caluculated. The result shows that the width of halloysite crystal is clearly different between hydrothermal and weathering products, though the difference of its length is not recognized between botll genesis. The mean values of width and its satndard deviatian of hydrothermal halloysite are distinctly smaller than them in weathering products. This result indicats that it is possible to distinctly know the genesis of tubular halloysite formed in altered granitic and rhyolitic rocks based on the mean value of width of halloysite crystals.
日本粘土学会の論文
1984-05-31