A Late Pleistocene marine clay succession at Kriegers Flak, westernmost Baltic, southern Scandinavia

Autor: Fredrik Klingberg
Rok vydání: 1998
Předmět:
Zdroj: Journal of Quaternary Science. 13:245-253
ISSN: 1099-1417
0267-8179
DOI: 10.1002/(sici)1099-1417(199805/06)13:3<245::aid-jqs358>3.0.co;2-g
Popis: In the Baltic Sea south of Skane county in southern Sweden, an over- consolidated marine clay succession on the northeastern slope of Kriegers Flak was observed in shallow seismic data as a unit overlain by younger Weichselian sediments. Two cores were taken from the clay succession. The Foraminifera present were predominantly of two species, Elphidium excavatum and Elphidium albiumbilicatum, reflecting deposition under arctic– boreal conditions. Stable oxygen isotope analyses were performed on foraminiferal tests, and the results show extremely light δ18O values ranging between −11‰ and −12‰. The cause of these extreme values is uncertain but may result from the high influence of meltwater. Brackish conditions are also indicated by the tolerance for low salinity shown by the Foraminifera. Radiocarbon dating shows an infinite age >40000 yr BP. The pollen flora seems mainly to have been redeposited, which makes interpretation difficult. The sea may have entered the Baltic basin during periods with high eustatic levels, an isostatic downloading of the crust, or a combination of both. It is suggested that the deposition of the overconsolidated marine clay succession occurred in the Late Saalian, Early Eemian or Early Weichselian. © 1998 John Wiley & Sons, Ltd.
Databáze: OpenAIRE
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