engleski

Luminescence and Radiocarbon dating of Three Loess Sections on the Island of Susak, Croatia

The loess-paleosol sequence on the island of Susak is a detailed Late Pleistocene archive of climate change in the North Adriatic Sea of Croatia. Quaternary deposits on Susak are up to 90 m thick and consist of loess, loess derivatives and sand, intercalated by numerous paleosols and at least three tephra layers. Three loess-paleosol sections were investigated and correlated. Altogether seventeen luminescence samples and six charcoal samples for radiocarbon dating were collected. Infrared optically stimulated luminescence (IRSL) dating was carried out on polymineral fine-grained material. A single aliquot regenerative (SAR) protocol was applied for equivalent dose (De) determination. The IRSL ages were fading corrected and are in good agreement with the radiocarbon dating results. The results show that loess and loess derivatives from the investigated sections represent a very detailed record correlating to Oxygen Isotope Stage (OIS) 3, with short periods of stronger sand deposition and occasional volcanic activity, most likely from Middle and South Italian volcanic provinces. Based on the luminescence dating results of the loess below and above the tephra layers, the middle tephra (TF2) shows an age range between 50.3 ± ; 3.5 ka and 47.5 ± ; 3.2 ka, while the age of the uppermost tephra layer (TF3) is between 37.8 ± ; 2.0 ka and 34.1 ± ; 1.9 ka. The extraordinary thickness of the deposits is very likely related to the vicinity of the river Po plain which extended to the south-east due to marine regressions of the Adriatic Sea during the cold periods of the Pleistocene.

loess; Susak; Croatia; luminescence dating; radiocarbon dating; geochronology; Late Pleistocene

nije evidentirano