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

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

2004-02-18

arxiv.org/abs/physics/0402092v1

Physics

Geophysics

Scientific paper

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.

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