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Concordant 210 Pb and 137Cs ages of Black Sea anoxic unconsolidated sediments.

Florea N., Cristache C., Oaie G., Duliu O. G.

Geochronometria

2011

Vol. 38, no. 2

101-106

Two independent geochronologic radiometric methods: 137 Cs and 210Pb were used to determine the sedimentation rate and subsequently to date the oldest sediments of a 50 cm core containing unconsolidated sediments collected at a depth of 600 m below sea surface in the anoxic zone of the Western Black Sea, off the Romanian town of Constanta. Both methods gave coincident value within experimental uncertainties of 0.42š0.20 mmźy-1 for 137 Cs and 0.49š0.03 mmźy-1 in the case of 210 Pb, within the Constant Initial Concentration model, which gave for the lower most sediments an age of 1.00š0.01 ka. The constant sedimentation model as well as the possible causes of observed discrepancy between experimental uncertainties are discussed.