Ionic ratio | Range | Comment | Interpretation |
SO4/Cl | 0.00 - 0.36 | High | Additional sources of SO4 from weathering of sulfates |
Na/Cl | 0.01 - 1.32 | High | Na-adsorption during freshening and a little silicate weathering |
Mg/Cl | 0 - 1.29 | High | Cation-exchange and silicate weathering of sandstones. |
Na/HCO3 | 0.02 - 3.38 | High | Substantial weathering of Na-feldspar or other Na-silicates |
Ca/HCO3 | 0.00 - 11.1 | High | Calc-carbonate dissolution or Calc-silicate weathering |
Ca/SO4 | 0.00 - 75.2 | High | Gypsum dissolution present |
Ca/Mg | 0.00 - 144.67 | High | Cation-exchange of weathering of silicate rocks. |
Ca + Mg/Na + K | 0.00 - 10.25 | High | Carbonate weathering |
HCO3/∑Anions | 0.04 - 0.91 | High | Weathering reactions and input of dissolved species in recharge area |
NO3/∑Anions | 0.00 - 0.39 | High | Anthropogenic contribution |
SO4/∑Anions | 0.00 - 0.09 | Low | No oxidation of sulphides. |
Mg/Ca | 0.00 - 2.44 | Low | Weathering of Silicate rocks |
Na/Na + Cl | 0.01 - 0.57 | High | Sodium source other than halite-albite, ion exchange |
Mg/Ca + Mg | 0.00 - 0.71 | High | Dolomite dissolution, calcite precipitation or saltwater |
Ca/Ca + SO4 | 0.00 - 1.00 | High | Calcium source other than gypsum |
Ca + Mg/SO4 | 0.00 - 195.26 | High |
|
Na + K − Cl/Na + K ? Cl + Ca | −4.39 - 112.22 | High | Plagioclase weathering unlikely |
Cl/∑Anions | 0.08 - 0.93 | High | Seawater or brine or evaporates |