Abstract
Chlorine 36 has many advantages as a dating tool for very old groundwater. These advantages include a suitable half‐life (3.01 × 105 years), simple geochemistry, conservative behavior in groundwater, and a general absence of subsurface sources at levels comparable to the atmospheric input. Recent advances in tandem accelerator mass spectrometry have permitted the analysis of 36Cl at the low abundance expected following residence in the subsurface for 106 years or more. In order to test the suitability of 36Cl for dating very old groundwater, the 36Cl/Cl ratios of 26 groundwater samples from the Great Artesian Basin of Australia have been measured. Groundwater ages calculated from the 36Cl data compare favorably with ages computed independently from hydrodynamic simulations.
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