Boron origins mixing and processes using B isotopes

The high HCO3 concentrations and the good correlation between HCO3 and Sr concentrations (R2 = 0.73) suggest that TIC10 the calcareous formations (Estiva, Gramame and Maria Farinha) can imprint the chemical signature of the Boa Viagem aquifer. In addition, the low strontium isotopic signature of the T-Q1 group can be explained by the carbonate dissolution of the Boa Viagem sediments, where the CaCO3 contents increase towards the seashore (Alheiros et al., 1995), or the carbonated formations, by release of strontium presenting an isotopic signature close to that of the sea during the last Pleistocene and Holocene transgressions.