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Evaluating the historical sedimentation patterns in two different Mediterranean deep environments (Sardinia and Sicily Channels)

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NOUR EL HOUDA HASSEN, NAFAÂ REGUIGUI, MOHAMED AMINE HELALI, NEZHA MEJJAD, ABDELMOURHIT LAISSAOUI, AZZOUZ BENKDAD, MONCEF BENMASOUR
NOUR EL HOUDA HASSEN, NAFAÂ REGUIGUI, MOHAMED AMINE HELALI, NEZHA MEJJAD, ABDELMOURHIT LAISSAOUI, AZZOUZ BENKDAD, MONCEF BENMASOUR

Abstract


The sediment accumulation rate in the Sardinia and Sicily channels in the central part of the Mediterranean Sea was studied by using short-lived radionuclides (210Pb and 137Cs) in two deep sediment cores. Different sedimentation regimes were identified indicating substantial differences in accumulation rates and historical patterns. The 210Pb-derived mean accumulation rate found in the Strait of Sardinia was 0.05 g.cm-2.y-1, lower than that in Sicily Channel (0.1 g.cm-2.y-1) suggesting an inverse correlation with water depth. Excess 210Pb inventories were 24 ± 1 and 6.0 ± 0.4 kBq.m-2, while the fluxes to the sediment were 745 ± 31 and 188 ± 11 Bq.m-2.y-1 in Sicily and Sardinia channels, respectively. 137Cs failed to use for the validation of the established chronologies, while its inventories found 450 Bq.m-2 and 355 Bq.m-2 in the Sicily and Sardinia channel, respectively.


Keywords


Mediterranean Sea ; Tunisian coast ; 210Pb and 137Cs ; sediment accumulation rate.

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