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

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

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PEETERS, Frank, Urs BEYERLE, Werner AESCHBACH-HERTIG, Johannes HOLOCHER, Matthias S. BRENNWALD, Rolf KIPFER, 2002. Improving noble gas based paleoclimate reconstruction and groundwater dating using 20Ne/22Ne ratios. In: Geochimica et Cosmochimica Acta. 67(4), pp. 587-600. ISSN 0016-7037

@article{Peeters2002Impro-7803, title={Improving noble gas based paleoclimate reconstruction and groundwater dating using 20Ne/22Ne ratios}, year={2002}, doi={10.1016/S0016-7037(02)00969-9}, number={4}, volume={67}, issn={0016-7037}, journal={Geochimica et Cosmochimica Acta}, pages={587--600}, author={Peeters, Frank and Beyerle, Urs and Aeschbach-Hertig, Werner and Holocher, Johannes and Brennwald, Matthias S. and Kipfer, Rolf} }

2011-03-24T17:37:39Z Kipfer, Rolf Holocher, Johannes Brennwald, Matthias S. Improving noble gas based paleoclimate reconstruction and groundwater dating using 20Ne/22Ne ratios Kipfer, Rolf Aeschbach-Hertig, Werner 2002 Beyerle, Urs Brennwald, Matthias S. Holocher, Johannes deposit-license Aeschbach-Hertig, Werner application/pdf Peeters, Frank eng 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,<br />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 20Ne/22Ne 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 3He of atmospheric origin (3Heatm) required to calculate 3H-3He 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 20Ne/22Ne ratio and the concentration of Ar enables a rigorous distinction between PR-, CE- and UA-model and a reliable determination of 3Heatm and of 3H-3He water ages. Peeters, Frank First publ. in: Geochimica et Cosmochimica Acta 67 (2002), 4, pp. 587-600 2011-03-24T17:37:39Z Beyerle, Urs

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