In a previous contribution the major ion chemistry from cold springs discharging from Nordeste Volcanic Complex (São Miguel, Azores) was described. From the data discussion provided in the present paper two master geochemical processes explain water composition: (1) sea salt input, due to seawater spraying, and (2) silicate hydrolysis. This latter processes explains the alkali metals enrichment observed in a large number of samples besides values expected considering only mixing with sea salts.