Meta-analysis of a Holocene 14C database for the detection of paleohydrological crisis in the Venetian–Friulian Plain (NE Italy)

作者: Sandro Rossato , Alessandro Fontana , Paolo Mozzi

DOI: 10.1016/J.CATENA.2014.10.033

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摘要: Abstract The Venetian–Friulian Plain is the northernmost alluvial environment facing Adriatic Sea and it represents transition from Mediterranean domain to Alps temperate regions of central eastern Europe. investigated area consists systems Brenta, Piave Tagliamento rivers, forming distinct megafans fed by mountain basins 1567, 3899 2580 km 2 , respectively. database radiocarbon dates related Holocene evolution 136 samples, 65 them classified as change-after dates. We analyzed statistically with aim detecting periods enhanced flooding activity. individual calibration probability intervals each age were summed, producing a cumulative density function (CPDF) plot for system whole database. Each CPDF has been subtracted its correspondent entire sub-dataset, obtaining relative (RCPF) curve. analysis these curves evidences that significant information are available between about 8.5 0.8 ka cal BP. In particular, nine activity have identified: 8.4–8.3, 7.5–7.2, 6.9–6.2, 5.5–5.3, 4.7–4.5, 2.3–2.1, 1.9–1.7, 1.6–1.4 1.3–0.8 ka cal interval 8.5–0.8 ka cal BP, some sub-periods not because relatively few available. Notably, 4.5 2.3 ka cal BP no recognized, even if important deposits documented in stratigraphic geomorphological record. Meta-analyses revealed quite good correlation several occurred study record Lake Iseo (northern Italy), well positive peaks Ice Rafted Debris (IRD) curve North Atlantic, namely Bond events 1, 3, 4 5. Comparison other flood sequences obtained Great Britain, Spain, Poland Germany same statistical approach used this work confirms presence common intervals. synchronous hydrological crisis recorded NE Italy Britain at 7.5–7.3, 6.9–6.5, 6.3–6.2, 1.5–1.4, 1.3–1.1, 0.9–0.8 ka cal Two them, 4.7–4.5 also Iberian Peninsula. These results suggest during middle late recurrently connected or phases climatic deterioration regional continental scale, minor influence local forcings.

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