It depends on the aquifer lithology from wich the water derived. Generally, the high SiO2 and F contents are always associated with water derived from Igneous (Granitic) aquifer. If the water passed through sedimentary sequence containing clay layers (before entring the Igneous aquifer), it may be subjected to cation exchange and acquire NaHCO3 type Formation of NaHCO3 type of water ? - ResearchGate. Available from: https://www.researchgate.net/post/Formation_of_NaHCO3_type_of_water [accessed Oct 28, 2016].
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