Manzala lagoon, Nile delta, Egypt: modern sediment accumulation based on radioactive tracers |
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| Authors: | L K Benninger I B Suayah D J Stanley |
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| Institution: | (1) Department of Geology, CB #3315 Mitchell Hall, University of North Carolina, Chapel Hill, NC 27599-3315, USA Tel.: +1 919 962-0699 · Fax: +1 919 966 4519, US;(2) Deltas-Global Change Program, Paleobiology E-206, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA, US |
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| Abstract: | This study was undertaken to determine whether recent anthropogenic changes in the Nile basin have affected the modern rate
of sediment accumulation in the Nile delta. Excess 210Pb, 137Cs, and 239,240Pu were used to develop a sediment chronology for a core from central Manzala lagoon, the delta sector which has had the highest
average rate of sediment accumulation during the Holocene (to about 0.7 cm year–1). Excess 210Pb was detected in the top 32 cm of the core, yielding an accumulation rate of 1.2 cm year–1, higher than the mean rate for the Holocene. A high 137Cs/239,240Pu ratio requires a reactor source (possibly Chernobyl) for these nuclides. Low concentrations of excess 210Pb and weapons-fallout nuclides precluded recognition of changes in sediment accumulation rate in Manzala lagoon during this
century and may limit the use of tracer radionuclides for modern sediment chronology in the Nile delta.
Received: 18 March 1997 · Accepted: 22 July 1997 |
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| Keywords: | Manzala lagoon Nile delta Chernobyl Radionuclides |
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