Istituto di Geoscienze e Georisorse     
Guidi M., Marini L., Scandiffio G., Cioni R. Chemical geothermometry in hydrothermal aqueous solutions: the influence of ion complexing. In: Geothermics, vol. 19 (5) pp. 415 - 441. Elsevier, 1990.
The molal concentrations of free ions and complex species of sodium, potassium, calcium, magnesium, sulfate and fluoride in hydrothermal aqueous solutions have been calculated at various temperatures (in the 150-300C range) and total chloride molalities, assuming the existence of equilibrium with the mineral paragenesis made up of low-albite, microcline, illite, chlorite, a Ca-Al-silicate, chalcedony, anhydrite, fluorite and calcite. Preliminary results suggest that the computer-calculated compositons match satisfactorily the compositions of real reservoir waters from some known geothermal system with different chloride contents. The computer-generated compositions have therefore been used to investigate the effect of complexing on chemical geothermometers. There is little effect of complexing on the Na/K geothermometer, while it is remarkably strong on the K2/Mg, Ca1/2/Na and Ca1/2/K geothermometer functions in low chloride environments; the influence of ion association is also important on the SO4/F2 geothermometer but at high chloride contents. Where the compatibility of sulfate and fluoride ions is questionable, specifc geothermometric functions can be derived taking into account chloride, sulfate and fluoride contents; their use is proposed to get rid of the derivations caused by ion association
URL: http://https://www.journals.elsevier.com/geothermics
Subject hydrothermal aqueous solutions
chemical geothermometers
reservoir temperature
geothermometric functions

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