Radiocarbon chronology of Black Sea sediments

摘要: Accelerator Mass Spectrometer (AMS) radiocarbon analyses have been made on 102 samples from 12 sediment cores and 23 two water column profiles. These materials, collected during the first leg of 1988 joint U.S.-Turkish Black Sea Expedition, provide most comprehensive chronology sediments yet attempted. Radiocarbon carefully box a mollusc shell live in 1931 suggest prebomb surface waters had Δ14C value −55% (460 years) that maximum detrital correction for ages Unit I is 580 years organic carbon 260 carbonate fractions. Evidence does not support 1430–2000 pre-bomb and/or corrections argued past studies. The best estimates age beginning final invasion coccolithophore Emiliania huxleyi (Unit boundary Ross Degens, 1974, Sea—geology, chemistry biology, pp. 183–199) E. huxeleyi I/II Hayet al., 1991, Deep-Sea Research, 38, S1211–S1235) are 1635 ± 60 2720 160 BP, respectively. Sapropel formation began at approximately 7540 130 BP all depths basin, pattern disagreement with those predicted by existing time-evolution models sapropel this basin. Our data oxic-anoxic interface has remained relatively stable throughout Holocene, controlled largely physical oceanography evolved as assumed previous workers.