Podobieństwo głębokich wód mineralnych w południkowym przekroju przez Polskę

Cyryl Kolago, Zenobiusz Płochniewski



Chemical diversity of mineral waters from natural outflows and shallow drillings is widely known to decrease along with depth. Waters encountered at large depths in individual points are as a rule characterized by more and more similar chemical composition but depths at which the latter phenomenon is recorded may be varying from one region to another.
Highly condensed and almost fully saturated waters are subjected to physico-mechanical regularities in markedly higher degree than clearly undersaturated ones from shallower zones. The influence of rock medium in deep- seated zones (except for those of halogenic complexes) on development of water composition appears much smaller than in the case of that typical of shallow zones. Hydrochemical sections through the area of southern Poland, presented by us in 1971 (Kwart. Geol., vol. 15, no. 2, 1971, pp. 465-472), showed similarity in type of waters from deep-seated zones. Here this question is analysed with reference to another hydrochemical section through the area of Poland.
In comparisons of the above mentioned hydrochemical sections through the Carpathians and their foreland (Carpathian Foredeep we were dealing with the case of occurrence of top surface of mineral waters at shallow depths. The section presented here from the area or Carpathian foreland to the Baltic Sea. displays high variability in depth of occurrence of top surface or the waters. Mineralization over 2 g/I is found almost at terrain surface in the Vistula River delta and at about 1.000 m depths in the Lublin-Radom region. However the diversity or sections and hydrochemical gradients is not found to hear any clear influence on the recorded uniformity in com position of waters at large depths.
In analysing typical processes of increase in water mineralization along with depth, the question of eventual presence of zones of large-amplitude hydrogeochemical inversion, known from various parts of the world (but. up to the present, not from area of our country), is left aside.
The enclosed figures show relations between total mineralization and contents of ions Cl- and J- as well as hydrochemical profiles evidencing a trend to uniformization of water chemistry along with depth in individual areas.

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