Casford, James SL; Rohling, Eelco J; Abu-Zied, Ramadan; Cooke, Steve; Fontanier, Christophe; Leng, M; Lykousis, Vasilios (2002): (Table 2) Age determination of Aegean Sea sediments [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.845168, Supplement to: Casford, JSL et al. (2002): Circulation changes and nutrient concentrations in the late Quaternary Aegean Sea: A nonsteady state concept for sapropel formation. Paleoceanography, 17(2), 14-1-14-11, https://doi.org/10.1029/2000PA000601
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Abstract:
The modern Aegean Sea is an important source of deep water for the eastern Mediterranean. Its contribution to deep water ventilation is known to fluctuate in response to climatic variation on a decadal timescale. This study uses marine micropalaeontological and stable isotope data to investigate longer-term variability during the late glacial and Holocene, in particular that associated with the deposition of the early Holocene dysoxic/anoxic sapropel S1. Concentrating on the onset of sapropel-forming conditions, we identify the start of 'seasonal' stratification and highlight a lag in d18O response of the planktonic foraminifer N. pachyderma to termination T1b as identified in the d18O record of G. ruber. By use of a simple model we determine that this offset cannot be a function of bioturbation effects. The lag is of the order of 1 kyr and suggests that isolation of intermediate/deep water preceded the start of sapropel formation by up to 1.5 kyr. Using this discovery, we propose an explanation for the major unresolved problem in sapropel studies, namely, the source of nutrient supply required for export productivity to reach levels needed for sustained sapropel deposition. We suggest that nutrients had been accumulating in a stagnant basin for 1-1.5 kyr and that these accumulated resources were utilized during the deposition of S1. In addition, we provide a first quantitative estimate of the diffusive (1/e) mixing timescale for the eastern Mediterranean in its "stratified" sapropel mode, which is of the order of 450 years.
Further details:
Facorellis, Yorgos; Maniatis, Yannis; Kromer, Bernd (1998): Apparent 14C ages of marine mollusk shells from a Greek Island; calculation of the marine reservoir effect in the Aegean Sea. Radiocarbon, 40(2), 963-973, https://doi.org/10.1017/S0033822200018932
Mercone, D; Thomson, J; Croudace, Ian W; Siani, Giuseppe; Paterne, Martine; Troelstra, Simon (2000): Duration of S1, the most recent sapropel in the eastern Mediterranean Sea, as indicated by accelerator mass spectrometry radiocarbon and geochemical evidence. Paleoceanography, 15(3), 336-347, https://doi.org/10.1029/1999PA000397
Stuiver, Minze; Reimer, Paula J (1993): Extended 14C data base and revised CALIB 3.0 14C age calibration program. Radiocarbon, 35(1), 215-230, https://doi.org/10.1017/S0033822200013904
Stuiver, Minze; Reimer, Paula J; Bard, Edouard; Beck, J Warren; Burr, George S; Hughen, Konrad A; Kromer, Bernd; McCormac, F Gerry; van der Plicht, Johannes; Spurk, Marco (1998): INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Radiocarbon, 40(3), 1041-1083, https://doi.org/10.1017/S0033822200019123
Coverage:
Median Latitude: 37.372223 * Median Longitude: 25.377777 * South-bound Latitude: 35.666670 * West-bound Longitude: 24.550000 * North-bound Latitude: 38.933330 * East-bound Longitude: 26.583330
Minimum DEPTH, sediment/rock: 0.5000 m * Maximum DEPTH, sediment/rock: 2.4250 m
Event(s):
Comment:
Dates are show as radiocarbon convention ages (conventional age), calibrated radiocarbon years B.C. (calibrated years B.C.) and as calibrated radiocarbon years B.P. (calibrated years B.P.). Analytical errors are given as years (± errors), and calibration fitting errors for a 1 sigma spread are shown in years (±1 sigma). Dating on LC-21 is after Mercone et al. (2000). Samples with codes starting CAM were prepared as graphite targets at the NERC radiocarbon laboratory and analyzed at the Lawrence Livermore National Laboratory AMS facility. Sample codes AA were prepared at Scottish Universities Reactor Research Centre at East Kilbride and analyzed at the Arizona Radiocarbon Facility. KIA sample codes indicate the Leibniz AMS Laboratory at Kiel. Radiocarbon dating was calibrated using CALIB 4.2 after Stuiver and Reimer (1993) and using the marine data set (Stuiver et al., 1998). A reservoir age correction (Delta R) of 149 ± 30 years was used (Facorellis et al., 1998).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Casford, James SL | |||
| 2 | Latitude of event | Latitude | Casford, James SL | |||
| 3 | Longitude of event | Longitude | Casford, James SL | |||
| 4 | Elevation of event | Elevation | m | Casford, James SL | ||
| 5 | Laboratory code/label | Lab label | Casford, James SL | |||
| 6 | DEPTH, sediment/rock | Depth sed | m | Casford, James SL | Geocode | |
| 7 | Age, dated | Age dated | ka | Casford, James SL | Age, 14C AMS | |
| 8 | Age, dated standard error | Age std e | ± | Casford, James SL | Age, 14C AMS | |
| 9 | Age | Age | a AD/CE | Casford, James SL | Age, 14C calibrated | |
| 10 | Calendar age | Cal age | ka BP | Casford, James SL | Age, 14C calibrated | |
| 11 | Calendar age, standard error | Cal age std e | ± | Casford, James SL | Age, 14C calibrated |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
108 data points