Wody magnezowe Polski na tle geochemii magnezu

Zenobiusz Płochniewski, Halina Ważny




The purpose of this work was to present geochemical properties of magnesium and of its occurrence in magnesium waters of Poland, i.e. in mineral waters, in which it makes more than 20% of e.p.m. of all cations. Data on the distribution of these waters are taken from several thousand chemical analyses of mineral waters in Poland. Fig. 2. presents the location of points in which waters, characterized by a mineralization greater than 1 g/l, contain magnesium in the amounts higher than 20% of e.p.m. The examinations have demonstrated that the magnesium content in ground waters of Poland widely ranges, maximum values so far ascertained being 51,6 g/l (Fig. 3). In an amount greater than 20 g/l magnesium occurs only in some strongly concentrated water solutions (with their total mineralization greater than 200 g/l). In the case of a lower mineralization the frequency of waters with Mg2+ content greater than 20% of e.p.m. is lower. No distinct correlation has been ascertained to occur between the ratio rCa2+/rMg2+ and the total mineralhation. An increase in magnesium content is simultaneous with the increase in calcium content, but quantitative relations of these chemical elements are not distinct (Fig. 5). Maximum content of magnesium is in waters of Permian formations, within the Fore-Sudetic monocline area. These are chloride waters characterized by a high total mineralization (frequently 200-400 g/l). Here the percentage of cations varies. Most frequently there are found here waters characterized by the following cation composition: Na+ > Ca2+ > Mg2+. Beside, there occur also waters, in which cations make the following series: Na+ > Mg2+ > Ca2+; Ma2+ > Ca2+ > Na+; Mg2+ > Ca2+; Mg2+ > Na+ > Ca2+. Outside the Fore-Sudetic monocline, considerable amounts of magnesium in ground waters of Poland have been found in several deep bore holes within the central and northern areas of the country (up to 20 g/l Mg2+). The present-day knowledge of the magnesium content in ground waters of Poland demonstrates that the most favourable conditions for concentration of this chemical element are in the Permian carbonate formations, particularly at the horizon of Main Dolomite (Stassfurt). The evaluation of the facts here considered and their logical relation with the geochemical tendencies of magnesium allows us to assume that the highly concentrated water solutions found to occur in the Permian formations within the Fore-Sudetic monocline are, partly art least, a relict of the Permian water basin. The problem concerns here mainly waters, which occur in the hydrodynamically isolated strata.

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