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One million year old groundwater in the Sahara revealed by krypton-81 and chlorine-36

Measurements of 81Kr/Kr in deep groundwater from the Nubian Aquifer (Egypt) were performed by a new laser-based atom-counting method. 81Kr ages range from \~2x10^5 to ~1x10^6 yr, correlate with 36Cl/Cl ratios, and are consistent with lateral flow of groundwater from a recharge area near the Uweinat Uplift in SW Egypt. Low delta-2H values of the 81Kr-dated groundwater reveal a recurrent Atlantic moisture source during Pleistocene pluvial periods. These results indicate that the 81Kr method for dating old groundwater is robust and such measurements can now be applied to a wide range of hydrologic problems.

preprint2004arXivOpen access
N. C. SturchioX. DuR. PurtschertB. E. LehmannM. SultanL. J. PattersonZ. -T. LuP. MuellerT. BiglerK. BaileyT. P. O'ConnorL. YoungR. LorenzoR. BeckerZ. El AlfyB. El KalioubyY. DawoodA. M. A. Abdallah
physics.atom-phphysics.geo-ph
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Open access18 authors2 topics
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N. C. SturchioX. DuR. PurtschertB. E. LehmannM. SultanL. J. PattersonZ. -T. LuP. MuellerT. BiglerK. BaileyT. P. O'ConnorL. YoungR. LorenzoR. BeckerZ. El AlfyB. El KalioubyY. DawoodA. M. A. Abdallah

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