Chemical geothermometry in hydrothermal aqueous solutions: the influence of ion complexing
Identifieur interne : 000426 ( Main/Exploration ); précédent : 000425; suivant : 000427Chemical geothermometry in hydrothermal aqueous solutions: the influence of ion complexing
Auteurs : M. Guidi [Italie] ; L. Marini [Italie] ; G. Scandiffio [Italie] ; R. Cionit [Italie]Source :
- Geothermics [ 0375-6505 ] ; 1990.
Descripteurs français
- Wicri :
- topic : Magnésium.
English descriptors
- KwdEn :
- Acta, Activity ratio, Activity ratios, Anhydrite, Aqueous complexes, Aqueous solution, Aqueous solutions, Aqueous species, Arnorsson, Calcite, Calcium complexes, Cation, Chalcedony, Chemical composition, Chemical geothermometry, Chemical model, Chloride, Chloride concentration, Chloride concentrations, Chloride content, Chloride contents, Chloride molalities, Chlorite, Complex species, Complexing, Concentration ratio, Concentration ratios, Dominant species, Elli, Fluoride, Fluoride ions, Fluorite, Fournier, Free calcium, Free ions, Free potassium, Geothermal, Geothermal reservoirs, Geothermal systems, Geothermal waters, Geothermometer, Geothermometry, Giggenbach, Guidi, Hydrothermal, Hydrothermal minerals, Ion, Latera, Magnesium, Microcline, Mineral assemblage, Molal ratio, Molality, Other hand, Partial pressure, Potassium contents, Present discussion, Silica, Sulfate, Sulfate complexes, Temperature curve, Temperature range, Thermodynamic data, Total chloride molality, Total concentration ratio, Total concentration ratios.
- Teeft :
- Acta, Activity ratio, Activity ratios, Anhydrite, Aqueous complexes, Aqueous solution, Aqueous solutions, Aqueous species, Arnorsson, Calcite, Calcium complexes, Cation, Chalcedony, Chemical composition, Chemical geothermometry, Chemical model, Chloride, Chloride concentration, Chloride concentrations, Chloride content, Chloride contents, Chloride molalities, Chlorite, Complex species, Complexing, Concentration ratio, Concentration ratios, Dominant species, Elli, Fluoride, Fluoride ions, Fluorite, Fournier, Free calcium, Free ions, Free potassium, Geothermal, Geothermal reservoirs, Geothermal systems, Geothermal waters, Geothermometer, Geothermometry, Giggenbach, Guidi, Hydrothermal, Hydrothermal minerals, Ion, Latera, Magnesium, Microcline, Mineral assemblage, Molal ratio, Molality, Other hand, Partial pressure, Potassium contents, Present discussion, Silica, Sulfate, Sulfate complexes, Temperature curve, Temperature range, Thermodynamic data, Total chloride molality, Total concentration ratio, Total concentration ratios.
Abstract
Abstract: 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 150–300°C 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 compositions match satisfactorily the compositions of real reservoir waters from some known geothermal systems with different chloride contents. The computer-generated compositions have therefore been used to investigate the effect of ion complexing on chemical geothcrmometers. There is little effect of complexing on the Na/K geothermometer, while it is remarkably strong on the K2/Mg, Ca 1 2/Na and Ca 1 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, specific geothermometric functions can he derived taking into account chloride, sulfate and fluoride contents; their use is proposed to get rid of the deviations caused by ion association.
Url:
DOI: 10.1016/0375-6505(90)90056-H
Affiliations:
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Le document en format XML
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<term>Activity ratios</term>
<term>Anhydrite</term>
<term>Aqueous complexes</term>
<term>Aqueous solution</term>
<term>Aqueous solutions</term>
<term>Aqueous species</term>
<term>Arnorsson</term>
<term>Calcite</term>
<term>Calcium complexes</term>
<term>Cation</term>
<term>Chalcedony</term>
<term>Chemical composition</term>
<term>Chemical geothermometry</term>
<term>Chemical model</term>
<term>Chloride</term>
<term>Chloride concentration</term>
<term>Chloride concentrations</term>
<term>Chloride content</term>
<term>Chloride contents</term>
<term>Chloride molalities</term>
<term>Chlorite</term>
<term>Complex species</term>
<term>Complexing</term>
<term>Concentration ratio</term>
<term>Concentration ratios</term>
<term>Dominant species</term>
<term>Elli</term>
<term>Fluoride</term>
<term>Fluoride ions</term>
<term>Fluorite</term>
<term>Fournier</term>
<term>Free calcium</term>
<term>Free ions</term>
<term>Free potassium</term>
<term>Geothermal</term>
<term>Geothermal reservoirs</term>
<term>Geothermal systems</term>
<term>Geothermal waters</term>
<term>Geothermometer</term>
<term>Geothermometry</term>
<term>Giggenbach</term>
<term>Guidi</term>
<term>Hydrothermal</term>
<term>Hydrothermal minerals</term>
<term>Ion</term>
<term>Latera</term>
<term>Magnesium</term>
<term>Microcline</term>
<term>Mineral assemblage</term>
<term>Molal ratio</term>
<term>Molality</term>
<term>Other hand</term>
<term>Partial pressure</term>
<term>Potassium contents</term>
<term>Present discussion</term>
<term>Silica</term>
<term>Sulfate</term>
<term>Sulfate complexes</term>
<term>Temperature curve</term>
<term>Temperature range</term>
<term>Thermodynamic data</term>
<term>Total chloride molality</term>
<term>Total concentration ratio</term>
<term>Total concentration ratios</term>
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<term>Activity ratio</term>
<term>Activity ratios</term>
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<term>Aqueous complexes</term>
<term>Aqueous solution</term>
<term>Aqueous solutions</term>
<term>Aqueous species</term>
<term>Arnorsson</term>
<term>Calcite</term>
<term>Calcium complexes</term>
<term>Cation</term>
<term>Chalcedony</term>
<term>Chemical composition</term>
<term>Chemical geothermometry</term>
<term>Chemical model</term>
<term>Chloride</term>
<term>Chloride concentration</term>
<term>Chloride concentrations</term>
<term>Chloride content</term>
<term>Chloride contents</term>
<term>Chloride molalities</term>
<term>Chlorite</term>
<term>Complex species</term>
<term>Complexing</term>
<term>Concentration ratio</term>
<term>Concentration ratios</term>
<term>Dominant species</term>
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<term>Fluoride</term>
<term>Fluoride ions</term>
<term>Fluorite</term>
<term>Fournier</term>
<term>Free calcium</term>
<term>Free ions</term>
<term>Free potassium</term>
<term>Geothermal</term>
<term>Geothermal reservoirs</term>
<term>Geothermal systems</term>
<term>Geothermal waters</term>
<term>Geothermometer</term>
<term>Geothermometry</term>
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<term>Guidi</term>
<term>Hydrothermal</term>
<term>Hydrothermal minerals</term>
<term>Ion</term>
<term>Latera</term>
<term>Magnesium</term>
<term>Microcline</term>
<term>Mineral assemblage</term>
<term>Molal ratio</term>
<term>Molality</term>
<term>Other hand</term>
<term>Partial pressure</term>
<term>Potassium contents</term>
<term>Present discussion</term>
<term>Silica</term>
<term>Sulfate</term>
<term>Sulfate complexes</term>
<term>Temperature curve</term>
<term>Temperature range</term>
<term>Thermodynamic data</term>
<term>Total chloride molality</term>
<term>Total concentration ratio</term>
<term>Total concentration ratios</term>
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<front><div type="abstract" xml:lang="en">Abstract: 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 150–300°C 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 compositions match satisfactorily the compositions of real reservoir waters from some known geothermal systems with different chloride contents. The computer-generated compositions have therefore been used to investigate the effect of ion complexing on chemical geothcrmometers. There is little effect of complexing on the Na/K geothermometer, while it is remarkably strong on the K2/Mg, Ca 1 2/Na and Ca 1 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, specific geothermometric functions can he derived taking into account chloride, sulfate and fluoride contents; their use is proposed to get rid of the deviations caused by ion association.</div>
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