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Geochemical Study of Mineral Springs in the Southeastern Part of Hyogo Prefecture, Southwest Japan

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  • Chemistry

Abstract

Journal of Geosciences,Osaka City University Vol. 25, Art. 1, p. 1-17 March, 1982 Geochem'ical' .Study. of Mineral Spri:ngs in' the Southeastern ~art of Hyogo Prefecture, Southwest Japan Harue MASUDA and Michiji TSURUMAKI (with 5 tables and 11 figures) , Abstract The purpose of this paper is to elucidate the relationship between the spatial dlstribution of water and/or gas chemistry of mineral springs and the subsurface geological sltuation in the south- eastern part of Hyogo Prefecture, Southwest Japan. First, the distribution of springs and the spatial water chemistry were investigated. The water chemistry can be classified as follows: a) Na-Ca-chloride type waters (Yashiro Town and its surroundings); 2) Na-(Ca)ーbicarbonate田chloridetype waters (Inagawa Town and its surroundings); and 3) Na-chloride type waters (Arima in Kobe City and Takarazuka City). Thc high chloride water in this area has a constant Br/Cl ratio of about 2.0 X 10- 3• The ratio ofHB02/Cl ofmineral springs in the Inagawa area (6 x 10-2) is higher than the others (1.6 x 10-2), with the difference probahly attributable to interaction with the host rock. Second, the bubble gas constituents accompanying mineral spring water were investigated. CO2 type gas is abundant in this area; NγCH4 type gas is found fiowing out only accompanying Na-Ca-Cl type water. The content of He might reflect fissure characteristics ~ the low He content of bubbles ascending with mineral waters around Inagawa Town, may be explained by the presence of many fissures that al10w the easy movement of fluids . • 1. Introduction The southeastern part of Hyogo Prefecture abounds in mineral springs. In this area, hot springs :flow out in Arima. These hot springs are famous for high temperatures (up to 900C), high salt content (up to 40 gjkg of chloride ion), and strong radioactivity. In view of these characteristics, much research into the ArInla hot springs has been carried out. But, heretofore, very few geoche

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