島根県飯石郡三刀屋町付近のセリサイト鉱床中の雲母粘土鉱物

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Many sericite deposits occurreing in granitic rocks are found in Mitoya-cho, Iishi-gun, Shimane Prefecture. These sericite deposits characterized by pale-green or white mica clay mineral are found along the nearly vertical fissures which strike N15-20°E and N50=70°W. The sericite ores mainly consist of mica clay mineral, calcite and quartz accompanied with a small amount of kaolinite, chlorite, smectite and occasionaly pyrite. The polytypes of mica clay mineral are 2M_1, 1M and 1Md, and those crystals consist of thin hexagonal plate, lath-shaped particle and irregulary plate respectively. Mica clay minerals are iron and/or magnesium rich dioctahedral species (phengite analogue). The strikes of ores consisting of the mica clay minerals of 2M_1 Polytype trend northwest, while those of 1M and/or 1Md trend northeast. Since calcite in the sericite deposits seems to be genetically related with the mica clay mineral, filling temperatures in calcite were studied. The range of value of filling temperature is 200-300℃. The modes of occurrence and mineralogical characteristics of mica clay mineral in the sericite deposits are closely similar to those of mica clay mineral in the clay veins generally found in granitic rocks in Chugoku province. Mica clay minerals in the veins were formed by the hydrothermal solution (Kitagawa & Kakitani, 1978, 1981). These results may be suggested that mica clay minerals in the sericite deposits were formed by the hydrothermal solution, whose temperature is 200-300℃, subsequent to the post granitic activity. Mica clay minerals in the sericite ores which strike northwest were generally formed at higher temperature than those in the sericite ores which strike northeast.
日本粘土学会の論文
1982-06-25

島根県飯石郡三刀屋町付近のセリサイト鉱床中の雲母粘土鉱物

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