In the Cabo aquifer B signatures

5.3. Aquifer freshening and related processes
5.4. Infiltration through paleochannels and local processes
The major role played by the palaeochannels and the present-day Capibaribe River channel for the deep Beberibe aquifer recharge has been evidenced by boron isotopes. Indeed, three groundwater samples from the Beberibe aquifer located in the immediate vicinity of the Capibaribe River present high fractionated values for boron isotopes that can only result from infiltration of relatively salty water with B interacting with clays, iron oxides, and organic matter.