Improving noble gas based paleoclimate reconstruction and groundwater dating using 20Ne/22Ne ratios

The interpretation of noble gas concentrations in groundwater with respect to recharge temperature and fractionated excess gas leads to different results on paleo-climatic conditions and on residence times depending on the choice of the gas partitioning model. Two fractionation models for the gas excess are in use, one assuming partial re-equilibration of groundwater supersaturated by excess air (PR-model, Stute et al., 1995), the other assuming closed-system equilibration of groundwater with entrapped air (CE-model, Aeschbach-Hertig et al., 2000). In the example of the Continental Terminal aquifers in Niger, PR- and CE- model are both consistent with the data on elemental noble gas concentrations (Ne, Ar, Kr, and Xe). Only by including the isotope ratio Ne-20/Ne-22 it can be demonstrated that the PR-model has to be rejected and the CE-model should be applied to the data. In dating applications He-3 of atmospheric origin (He-3(atm)) required to calculate H-3-He-3 water ages is commonly estimated from the Ne excess presuming that gas excess is unfractionated air (UA-model). Including in addition to the Ne concentration the Ne-20/Ne-22 ratio and the concentration of Ar enables a rigorous distinction between PR-, CE- and UA-model and a reliable determination of He-3(atm) and of H-3-He-3 water ages. Copyright (C) 2002 Elsevier Science Ltd.