Hidrológiai Közlöny 1933 (13. évfolyam)

Gedeon Tihamér: Szulfátos vizek képződése

Formation of sulfate containing waters 103 Formation Formation warmUi of warmth: 1

1 an equivalent weight: CaS04 336.9 168.4 Kcal KsSOi 334.2 167.1 „ Na

2S04 328

J 164.0 „ MgS04 322.8 161.4 „ A1

2(S04)

3 879.7 146.6 „ FeS04 93.2 46.6 „ Fe

2(S04)

3 224.9 37.5 „ Fe(OH)

3 191.2 63.7 „ As we see gypsum has the highest formation warmth value. Thus the formed sulfuric acid gets first combined with the present calcium. Then K2SO4 and NaeSCU, etc. is formed until the whole amount of free acid is bound. The free acid dissolves namely the minerals of the mother roc'k and naturally decomposes the most irresistent parts. To begin with the example at Őrsöd, there the blue clay contains more K2O than Na

20; the formed bitter water, however, consists considerably less K and much Na. This can be explained by the fact the K occurs mostly in the form of muscovite which is not offended by sulfuric acid. Muscovite namely can be found unvaried within the weathered yellow „KisceH" clay.

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2 In case the mother rock contains more S than wanted to transform the alkali metals to sulfate salts, bitter water is formed. The same results may be found if the mother rock contains Mg minerals (as in the Őrsöd example biotite, chlorite) which may be decomposed easier than the present Na minerals. In case neither of the above mentioned mineral constituents would be present, the hydrosilicates of aluminium will be offended and alum waters will be formed. A striking example is the alum water occurrence at Gánt. The pyrite containing blue clay which covers the bauxite layers is formed of bauxites accumulated during the Middle Eocenic by washing down off higher levels.

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3 This matter contains almost no K, Na, Mg minerals at all and the sulfuric acid formed of the pyrite could only dissolve Al. On calculating from the data of rock analysis how much sulfuric acid is wanted to the solution of the oxydes of Ca, K, Na, Mg, " Chemiker Kalender, 1933. III. 320. 1

2 See foot-note 6. pages 106 and 113. " Gedeon T.: Földtani Közi., LXIL 1932.