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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.
 
 
Abstract
(English)
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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