Geothermal Solute Equilibria, Derivation Of Na-K-Mg-Ca Geoindicators

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Journal Article: Geothermal Solute Equilibria, Derivation Of Na-K-Mg-Ca Geoindicators

Abstract
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 most slowly (c1 in mg/kg, T in K). The quotient adjusts much faster and to low temperatures (<100°C) according to . The system K-Ca is sensitive to variations in fco2 with These subsystems are combined to obtain graphical techniques for the evaluation of deep temperatures and CO2-partial pressures by use of Na, K, Mg and Ca contents of geothermal water discharges.

Author 
Werner F. Giggenbach








Published Journal 
Geochimica et Cosmochimica Acta, 1988





DOI 
10.1016/0016-7037(88)90143-3

Online 
Internet link for Geothermal Solute Equilibria, Derivation Of Na-K-Mg-Ca Geoindicators

Citation

Werner F. Giggenbach. 1988. Geothermal Solute Equilibria, Derivation Of Na-K-Mg-Ca Geoindicators. Geochimica et Cosmochimica Acta. 52(12):2749–2765.