Argentina 8 groundwater-surface water interaction 8 hydrogeochemistry 6 stable isotope 6 Aquifers 4 Cordoba [Argentina] 4 Geochemical modeling 4 Groundwater 4 Groundwater resources 4 Hydrochemistry 4 Isotopes 4 Numerical models 4 Pampas 4 Stable isotopes 4 Surface waters 4 groundwater 4 groundwater flow 4 mixing 4 surface water 4 unconfined aquifer 4 Activity results 2 Aji Basin 2 Amorphous silica 2 Anoxic sediments 2 Bacillariophyta 2 Biogenic silica 2 Biogeochemical cycle 2 Biogeochemistry 2 Biomineralization 2 Bottom sediments 2