岩質と陸水の水質との関係 –岩石の溶出実験による解析– [in Japanese] Relation between land-water quality and its surrounding geology: Analysis from leaching experiments of rocks [in Japanese]
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Experriments of cation leaching (Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, and Mg<sup>2+</sup>) from rocks to CO<sub>2</sub> saturated water were carried out to clarify the relation between water quality and surrounding rocks. Rock samples use were: 15 granite, 5 rhyolite, 15 andesite, 6 granodiorite, 13 basalt, 6 tuff, 3 mudstone, 6 sandstone, 19 feldspar, and 7 mica samples. On the trilinear diagram, results of granite, rhylite, and basalt agreed with water quality in respective rock areas. The rocks, therefore, affect the quality of water nearby. Alkali feldsper in granite and rhyolite, and plagioclase in olivine basalt readily dissolved in the CO<sub>2</sub> saturated water. The quality of ground and stream water depends on the ratio of cations leached into water from those feldspars.
Chikyukagaku 22(2), 139-147, 1988
The Geochemical Society of Japan