Abstract
The distribution of radioactive and radiogenic isotopes such as 36Cl and 4He provides important information about the residence time (or “age”) and flow velocity of groundwater in sedimentary basins, but the relationship between the distribution of an isotope and the basin hydrology is not always clear. We use reactive transport modeling to investigate the controls on isotope distribution and groundwater residence time in hypothetical and real flow regimes. Our results show that by moving beyond the simple “piston flow” concept, we can use isotope distributions to constrain internally consistent descriptions of deep groundwater flow regimes within sedimentary basins.
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