Other
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2749g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 12, pp.2749-2765
Other
53
Scientific paper
Relative Na, K, Mg, and Ca contents of thermal waters in full equilibrium with a thermodynamically stable mineral system derived through isochemical recrystallisation of an average crustal rock are, at a given temperature and salinity, uniquely fixed. Together with the compositions of waters resulting from isochemical rock dissolution, they provide valuable references for the assessment of the degree of attainment of fluid-rock equilibrium. In geothermal systems, the pair K-Na reaches its equilibrium contents as governed by L kn = log ( c K / c Na ) = 1.75 - (1390/ T ) most slowly ( c 1 in mg/kg, T in K). The quotient c 2 K / c Mg adjusts much faster and to low temperatures (<100°C) according to L km = log ( c 2 K / c Mg ) = 14.0 - (4410/ T ). The system K-Ca is sensitive to variations in f co 2 with L kc = log ( c 2 K / c Ca ) = log f co 2 + 3.0. These subsystems are combined to obtain graphical techniques for the evaluation of deep temperatures and CO 2 -partial pressures by use of Na, K, Mg and Ca contents of geothermal water discharges.
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