HR: 09:30h
AN: H41I-07    [Abstracts]
TI: One Million Year Old Groundwater in the Sahara Revealed by Krypton-81 and Chlorine-36
AU: * Sturchio, N C
EM: sturchio@uic.edu
AF: Earth & Environmental Sciences Univ. of Illinois at Chicago, 845 West Taylor St., MC-186, Chicago, IL 60607 United States
AU: Lu, Z
EM: lu@anl.gov
AF: Physics Division Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439 United States
AU: Lu, Z
EM: lu@anl.gov
AF: Enrico Fermi Institute and Physics Dept. University of Chicago, 5640 South Ellis Ave., Chicago, IL 60637 United States
AU: Du, X
AF: Physics Division Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439 United States
AU: Purtschert, R
EM: purtschert@climate.unibe.ch
AF: Institute of Physics University of Bern, Sidlerstrasse 5, Bern, CH-3012 Switzerland
AU: Lehmann, B E
AF: Institute of Physics University of Bern, Sidlerstrasse 5, Bern, CH-3012 Switzerland
AU: Sultan, M I
EM: mohamed.sultan@wmich.edu
AF: Dept. of Geosciences Western Michigan University, 1903 West Michigan Ave., Kalamazoo, MI 49008 United States
AU: Patterson, L J
AF: Earth & Environmental Sciences Univ. of Illinois at Chicago, 845 West Taylor St., MC-186, Chicago, IL 60607 United States
AU: Muller, P
AF: Physics Division Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439 United States
AU: Bigler, T
AF: Institute of Physics University of Bern, Sidlerstrasse 5, Bern, CH-3012 Switzerland
AU: Bailey, K
AF: Physics Division Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439 United States
AU: O'Connor, T P
AF: Physics Division Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439 United States
AU: Young, L
AF: Chemistry Division Argonne National Laboratory, 9700 South Cass Ave., Argonne, IL 60439 United States
AU: Lorenzo, R
AF: Institute of Physics University of Bern, Sidlerstrasse 5, Bern, CH-3012 Switzerland
AU: Becker, R
AF: Dept. of Geosciences Western Michigan University, 1903 West Michigan Ave., Kalamazoo, MI 49008 United States
AU: El Alfy, Z
AF: Egyptian Geological Survey, 3 Salah Salem St., Cairo, 11566 Egypt
AU: El Kaliouby, B
AF: Geology Dept. Ain Shams University, 1 Salah Salem St., Cairo, 11566 Egypt
AU: Dawood, Y H
AF: Geology Dept. Ain Shams University, 1 Salah Salem St., Cairo, 11566 Egypt
AU: Abdallah, A M
AF: Geology Dept. Ain Shams University, 1 Salah Salem St., Cairo, 11566 Egypt
AB: 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 about 2x10e5 to about 1x10e6 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.
DE: 1829 Groundwater hydrology
DE: 1832 Groundwater transport
DE: 1035 Geochronology
DE: 1040 Isotopic composition/chemistry
DE: 1045 Low-temperature geochemistry
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting