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

N. C. Sturchio, X. Du, R. Purtschert +15

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, c…