- 期刊
Composition and Origin of the Middle Weichselian Interstadial Deposit in Veskoniemi, Northern Finland
並列摘要
The stratigraphy and sedimentology of a diamicton-stratified sand deposit have been studied in the Veskoniemi area, near Lake Inarijärvi in central Finnish Lapland. Test pit excavations were used for stratigraphical investigations. Till-covered laminar and crossbedded sands were dated using optically stimulated luminescence (OSL). Ages range between 21.0 ± 1.5 and 22.4 ± 1.6 ka for laminated sands at upper levels and 39 ± 3 and 46 ± 3 ka for sands at deeper levels. These dating results strengthen the evidence for a Middle Weichselian interstadial in northern Finland during oxygen isotope stage 3, and can be compared with other results in eastern and southern Lapland. This is the first time that sediments from the Middle and Late Weichselian contact have been identified in Finland. These new dating results indicate that an ice-free period could have lasted from halfway through the Middle Weichselian to the beginning of the Late Weichselian about 22-25 ka ago in northern Finland.
並列關鍵字
stratigraphy ； stratified sand ； till ； optically stimulated luminescence ； interstadial ； Middle Weichselian ； Veskoniemi ； Lapland ； Finland延伸閱讀
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