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Table 2

Summary of the groundwater mass balance results in the SGA (Jafari 2003)

Reaction (coefficients × 104)Altered mineral and product (moles/L × 104)
Halite dissolution 
 20.25NaCl = 20.25Na+ + 20.25Cl 20.25 Halite 
Gypsum dissolution 
 6.85CaSO4 = 6.85Ca2+ + 6.85SO42− 6.85 Gypsum 
Weathering of biotite to kaolinite 
 2.61KMg3AlSi3O10(OH)2 + 18.27CO2 + 9.135H2O = 1.31Al2Si2O5(OH)4 + 7.83 Mg2+ + 2.61 K+ + 5.22SiO2 + 18.27HCO3 2.61 Biotite; 1.31 Kaolinite 
Weathering of plagioclase to kaolinite 
 0.1Na0.8Ca0.2Al1.4Si2.6O8 + 0.12CO2 + 0.2H2O = 0.07Al2Si2O5(OH)4 + 0.08Na+ + 0.02Ca2+ + 0.12SiO2 + 0.12HCO3 0.1 Plagioclase; 0.07 Kaolinite 
Calcite dissolution 
 12.55CaCO3 + 12.55CO2 + 12.551H2O = 12.551Ca2+ + 25.1HCO3 12.55 Calcite 
Reaction (coefficients × 104)Altered mineral and product (moles/L × 104)
Halite dissolution 
 20.25NaCl = 20.25Na+ + 20.25Cl 20.25 Halite 
Gypsum dissolution 
 6.85CaSO4 = 6.85Ca2+ + 6.85SO42− 6.85 Gypsum 
Weathering of biotite to kaolinite 
 2.61KMg3AlSi3O10(OH)2 + 18.27CO2 + 9.135H2O = 1.31Al2Si2O5(OH)4 + 7.83 Mg2+ + 2.61 K+ + 5.22SiO2 + 18.27HCO3 2.61 Biotite; 1.31 Kaolinite 
Weathering of plagioclase to kaolinite 
 0.1Na0.8Ca0.2Al1.4Si2.6O8 + 0.12CO2 + 0.2H2O = 0.07Al2Si2O5(OH)4 + 0.08Na+ + 0.02Ca2+ + 0.12SiO2 + 0.12HCO3 0.1 Plagioclase; 0.07 Kaolinite 
Calcite dissolution 
 12.55CaCO3 + 12.55CO2 + 12.551H2O = 12.551Ca2+ + 25.1HCO3 12.55 Calcite 
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