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Precipitation Source Inferred from Stable Isotopic Composition of Pleistocene Groundwater and Carbonate Deposits in the Western Desert of Egypt

  • Mohamed Sultan (a1), Neil Sturchio (a1), Fekri A. Hassan (a2), Mohamed Abdel Rahman Hamdan (a3), Abdel Moneim Mahmood (a4), Zeinhom El Alfy (a5) and Tom Stein (a6)...
Abstract

An Atlantic source of precipitation can be inferred from stable isotopic data (H and O) for fossil groundwaters and uranium-series-dated carbonate spring deposits from oases in the Western Desert of Egypt. In the context of available stable isotopic data for fossil groundwaters throughout North Africa, the observed isotopic depletions (δD −72 to −81‰; δ18O −10.6 to −11.5‰) of fossil (≥32,000 yr B.P.) groundwaters from the Nubian aquifer are best explained by progressive condensation of water vapor from paleowesterly wet oceanic air masses that traveled across North Africa and operated at least as far back as 450,000 yr before the present. The values of δ18O (17.1 to 25.9‰) for 45,000- to >450,000-yr-old tufas and vein-filling calcite deposits from the Kharga and Farafra Oases are consistent with deposition from groundwaters having oxygen isotopic compositions similar to those of fossil groundwaters sampled recently at these locations.

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Bakri, A.E., Tantawi, A., Blavoux, B., Dray, M., (1992). Sources of water recharge identified by isotopes in El Minya Governate (Nile Valley, Middle Egypt). Isotope Techniques in Water Resources Development 1991: Proceedings of an International Symposium on Isotope Techniques in Water Resources Development. International Atomic Energy Agency, Vienna, p. 643644.
Ball, J., (1927). Problems of the Libyan Desert. Geographical Journal. 70.
Brooks, I.A., (1993). Late Pleistocene basinal sediments, Dakhla Oasis region, Egypt: A noninterglacial pluvial. Geoscientific Research in Northeast Africa. Balkema, Brookfield, p. 627633.
Coleman, M., Shepherd, T.J., Durham, J.J., Rouse, J.E., Moore, G.R., (1982). Reduction of water with zinc for hydrogen isotope analysis. Analytical Chemistry. 54, 993995.
Craig, H., (1961). Isotopic variations in meteoric waters. Science. 133, 17021703.
Degens, E.T., (1962). Geochemische Untersuchungen von Wassern aus der Aegyptischen Sahara. Geologische Rundshau. 52, 625655.
Dray, M., Gonfiantini, R., Zuppi, G.M., (1983). Isotopic composition of groundwater in the southern Sahara. Paleoclimates and Paleowaters: A Collection of Environmental Isotope Studies. International Atomic Energy Agency, Vienna, p. 187199.
Epstein, S., Mayeda, T.K., (1953). Variations of18 . Geochimica et Cosmochimica Acta. 4, 213224.
Fairbridge, R.W., (1986). Monsoons and paleomonsoons. Episodes. 9, 143149.
Groning, M., Sonntag, C., Suckow, A., Geoscientific Research in Northeast Africa. Isotopic evidence for extremely low groundwater recharge in the Sahel zone of Sudan. Thorweihe, U., Schandelmeier, H., (1993). Balkema, Brookfield, 671676.
Hamdan, M. A., Mahmoud, A. M., Hassan, F., (1996). Geology of the tufa deposits in the northeastern corner of the Kharga Oasis. Western Desert, Egypt, Proceedings of the Third International Conference on the Geology of the Arab World. Cairo, Egypt.
Hess, K.-H., Hissene, A., Kheir, O., Schnacker, E., Schneider, M., Thorweihe, U., (1987). Hydrogeological investigations in the Nubian Aquifer System, Eastern Sahara. Klitzsch, E., Schrank, E., Research in Egypt and Sudan. Verlag Von Dietrich Reimer, Berlin, 397464.
Issar, B., Nativ, R., (1988). Waters beneath deserts: Keys to the past, a resource for the present. Episodes. 11, 256262.
Joseph, A., Frangi, J.P., Aranyossy, J.F., (1992). Isotope characteristics of meteoric water and groundwater in the Sahelo-Sudanese zone. Journal of Geophysical Research. 97, 75437551.
Klitzsch, E., List, F. K., Pohlmann, G., (1987). Geological Map of Egypt, Kharga Sheet: Scale 1:100,000. The Egyptian General Petroleum Corporation/Conoco. Cairo, Egypt.
Leguy, C., Rindsberger, M., Zangwil, A., Issar, A., Gat, J.R., (1983). The relation between the δ18 . Isotope Geoscience. 1, 205218.
Lezine, A.-M., (1991). West African paleoclimates during the last climate cycle inferred from an Atlantic deep-sea pollen record. Quaternary Research. 35, 456463.
Lezine, A.-M., Casanova, J., (1991). Correlated oceanic and continental records demonstrate past climate and hydrology of North Africa (0–140 Ka). Geology. 19, 307310.
Maley, J., (1977). Paleoclimates of central Sahara during the early Holocene. Nature. 269, 573577.
McCrea, J.M., (1950). The isotopic chemistry of carbonates and a paleotemperature scale. Journal of Chemical Physics. 18, 849857.
Muller, A. B., Haynes Jr., C. V., (1984). Isotope hydrology of the shallow groundwaters of the Western Desert. Isotope Hydrology, 1983: Proceedings of an International Symposium on Isotope Hydrology in Water Resources Development. 843, 846, International Atomic Energy Agency, Vienna.
Munich, K.O., Vogel, J.C., (1962). Untersuchungen an Pluvialen Wassern der Ost-Sahara. Geologische Rundschau. 52, 611624.
O'Neil, J.R., Clayton, R.N., Mayeda, T.K., (1969). Oxygen isotope fractionation in divalent metal carbonates. Journal of Chemical Physics. 51, 55475558.
Petit-Maire, N., (1986). Paleoclimates in the Sahara of Mali: A multidisciplinary study. Episodes. 9, 715.
Petit-Maire, N., (1989). Interglacial environments in presently hyperarid Sahara: Paleoclimatic implications. Leinen, M., Sarnthein, M., Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport. Kluwer, Dordrecht, 637661.
Prell, W.L., Kutzbach, J.E., (1987). Monsoon variability over the past 150,000 years. Journal of Geophysical Research. 92, 84118425.
Ritchie, J.C., Haynes, C.V., (1987). Holocene vegetation zonation in eastern Sahara. Nature. 330, 645647.
Rossignol-Strick, M., (1983). African monsoons, an immediate climate response to orbital insolation. Nature. 304, 4649.
Rudolph, J., Rath, H. K., Sonntag, C., (1984). Noble gases and stable isotopes in14, Isotope Hydrology, 1983: Proceedings of an International Symposium on Isotope Hydrology in Water Resources Development. 467, 477, International Atomic Energy Agency, Vienna.
Said, R., (1990). Quaternary. Said, R., The Geology of Egypt. Balkema, Brookfield, 487507.
Sanford, K.S., (1935). Sources of water in north-western Sudan. Geographical Journal. 85, 412431.
Sonntag, C., Klitzsch, E., Lohnert, E. P., El Shazly, E. M., Munnich, K. O., Junghans, Ch., Thorweihe, U., Weistroffer, K., Swailem, F. M., (1978). Paleoclimatic information from deuterium and oxygen-18 in carbon-14-dated north Saharian groundwaters. Isotope Hydrology ’978: Proceedings of an International Symposium on Isotope Hydrology. 569, 580, International Atomic Energy Agency, Vienna.
Stuiver, M., Polach, H.A., (1977). Reporting of14 . Radiocarbon. 19, 355363.
Sturchio, N.C., Binz, C.M., (1988). Uranium-series age determination of calcite veins, VC-1 drill core, Valles Caldera, New Mexico. Journal of Geophysical Research. 93, 60976102.
Suckow, A., Sonntag, C., Groning, M., Thorweihe, U., (1993). Ground water recharge in the Umm Kedada Basin, NW-Sudan, derived from environmental isotopes of soil moisture in samples collected from deep dug wells. Thorweihe, U., Schandelmeier, H., Geoscientific Research in Northeast Africa. Balkema, Brookfield, 665669.
Swanberg, C.A., Morgan, P., Boulos, F.K., (1984). Geochemistry of the groundwaters of Egypt. Annals Geological Survey of Egypt. 14, 127150.
Szabo, B.J., Haynes, C.V., Maxwell, T.A., (1995). Ages of Quaternary pluvial episodes determined by uranium-series and radiocarbon dating of lacustrine deposits of eastern Sahara. Paleogeography, Paleoclimatology, Paleoecology. 113, 227242.
Thorweihe, U., (1982). Hydrogeologie des Dakhla Bekens (Agypten). Berliner Geowiss. Abh. A. 38, 153.
Vrbka, P., Thorweihe, U., (1993). Hydrology of the Wadi El Milk-Wadi Muqaddam area, northern Sudan. Thorweihe, U., Schandelmeier, H., Geoscientific Research in Northeast Africa. Balkema, Brookfield, 693698.
Yan, Z., Petit-Maire, N., (1994). The last 140 Ka in the Afro-Asian arid/semi-arid transitional zone. Paleogeography, Paleoclimatology, Paleoecology. 110, 217233.
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Quaternary Research
  • ISSN: 0033-5894
  • EISSN: 1096-0287
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