Radiometric and tephroanalysis dating of recent Ionian Sea cores
- 44 Downloads
An accurate dating of recent Ionian Sea sediment cores has been performed by the210Pb radiometric method and by a detailed tephroanalysis. The markers of the historical volcanic eruptions which occurred in the Campanian area (Vesuvius, Phlegrean Fields, Ischia) during the last two millenia have been identified along the cores. Among the others, the famous Plinian Vesuvius eruption of 79 AD, which buried the Roman town of Pompei, has been recognized. Direct210Pb dating is limited to the last two centuries. The tephroanalysis demonstrates that the sedimentation rate estimated by the210Pb method is correct and it is constant, at least for the last 2 ky. The presence of the137Cs peak due to the intense activity of nuclear-weapon testing in the atmosphere in 1963–64 AD assures that the top of the core is present and not disturbed. The high precision of the core dating allows to transform the depth scale into a time scale with an accuracy of ∼1%. The analysis of several cores taken in the same area demonstrates that the results presented here are of general validity, at least in this region. The carbonatic mud deposited in the last millennia in the Gallipoli Terrace can be successfully utilized for investigating the environmental conditions in the recent past.
PACS 91.35. NmGeochronology
PACS 91.50Marine geology and geophysics
PACS 29.70. GcRadiation measurement detection and counting
PACS 91.50. EyOcean bottom processes
Unable to display preview. Download preview PDF.
- G. Cini Castagnoli, G. Bonino andA. Provenzale: inThe Sun in Time, edited byC. P. Sonett, M. S. Giampapa andM. S. Matthews (University of Arizona Press., 1991) p. 562.Google Scholar
- G. Bonino, G. Cini Castagnoli, A. Longhetto andG. Queirazza:Atti Acad. Sci. Torino, Cl. Sci. Fis., Nat.,113, 255 (1979).Google Scholar
- R. Santacroce (Editor):Somma-Vesuvius, Quad. Ric. Sci.,114–8, Consiglio Nazionale delle Ricerche, Roma (1987).Google Scholar
- M. Rosi andA. Sbrana (Editors):Phlegrean Fields, Quad. Ric. Sci.,114–9, Consiglio Nazionale delle Ricerche, Roma (1987).Google Scholar