水-岩石相互作用の生成物としてのアルリカ性鉱泉水

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This paper describes the chemistry of alkaline spring waters from the Abukuma mountain area, Fukushima Prefecture. The waters are formed by reaction of rainwater with felsic rocks under a limited CO_2 supply. The data are plotted on a log (aCa^2+/a^2H+)-log asio_2 diagram (Fig. 1). Most of samples are located in a small area on the diagram. The waters having a pH higher than 9 are shown to be saturated with respect to calcite, thus suggesting that the alkaline waters represent an equilibrium product of water-felsic rock interaction. Assuming that the waters are in equilibrium with kaolinite-Ca-montmorillonite assemblage, the equilibrium constant for reaction (1) (see text) is estimated to be -11 as pK. However the chemistry of these waters cannot be fully explained by the system kaolinite-Ca-montmorillonite-aqueous solution. An additional Ca mineral, possibly Ca-zeolite, should be included in the system.
日本地球化学会の論文
1982-11-30