広島県賀茂郡八本松町の花崗岩中にある白色粘土細脈
1978 年 18 巻 2 号 p. 31-39
詳細
1978 年 18 巻 2 号 p. 31-39
The constituent minerals of the white clay vein (ca. 6m in the vertical direction) and those in its surrounding granitic rock of the Hachihonmatsu district, Hiroshima Prefecture have been examined by the technics of X-ray powder diffraction, DTA, chemical analysis, electron-microscopic observation and measurement of abrasion pH etc., and the origin of the clay vein and the constituent minerals have been also discussed in this paper.
The clay vein mainly consists of halloysite, kaolinite and a small amount of quartz, while the clay minerals of weathered plagioclase in granitic rock surrounding the clay vein are of halloysite only. There are some morphological differences between the halloysite of the clay vein and that of weathered plagioclase, observed under the electron-microscop, and also the results of DTA, chemical analysis and abrasion pH show some differences between them.
It seems that the kaolin minerals in the clay vein are of hydrothermal origin and remaine unchanged through weathering.
