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A systematic deviation from Na-K-Ca geothermometer below 75°C and above 10?4 atm Pco2

Authors:	Tomá? Pa?es

Institution:	Geological Survey, Prague, Malostranské nám. 19, 118 21 Praha 1, Czechoslovakia

Abstract:	If the temperature of ground water is below 75°C and the partial pressure of CO₂ in the aquifer is above 10^?4 atm, a chemical steady-state between water and felsic rocks (rather than chemical equilibrium) may be maintained. The temperature of water in the aquifer may be estimated using a modified form of the Na-K-Ca geothermometer from, $I = ?1.36 ?0.253 log P_{co_{2}}$ . where the departure of the steady-state from equilibrium, $I$ , is a function of $P_{co_{2}}$ : $I = ?1.36 ?0.253 log P_{co_{2}}$ .

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