IMPROVING NOBLE GAS BASED PALEOCLIMATE RECONSTRUCTION AND GROUNDWATER DATING USING 20NE/22NE RATIOS
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dc.contributor.author | Peeter F. | |
dc.contributor.author | Aeschbach-Hertig W. | |
dc.contributor.author | Holocher J. | |
dc.contributor.author | Brennwald M.S. | |
dc.contributor.author | Kipfer R. | |
dc.contributor.author | Beyerle U. | |
dc.date.accessioned | 2021-11-23T00:58:50Z | |
dc.date.available | 2021-11-23T00:58:50Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13736883 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 4, 587-600 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32431 | |
dc.description.abstract | 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 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. | |
dc.title | IMPROVING NOBLE GAS BASED PALEOCLIMATE RECONSTRUCTION AND GROUNDWATER DATING USING 20NE/22NE RATIOS | |
dc.type | Статья |
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