Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet

Quaternary Science Advances

Nick Eyles¹  Pertti Sarala²  Jouni Pihlaja³  Heidi Daxberger⁴  Niko Putkinen⁵  Andrew Murray⁶ 

[1] Corresponding author. Geological Survey of Finland, P.O. Box 97, 67101, Kokkola, Finland.;Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland;Oulu Mining School, P.O. Box 3000, FI-90014, University of Oulu, Finland;Geological Survey of Finland, P.O. Box 77, 96101, Rovaniemi, Finland;Geological Survey of Finland, P.O. Box 97, 67101, Kokkola, Finland;University of Toronto at Scarborough, 1265 Military Trail, Scarborough, Ontario, M1C 1A4, Canada;

关键词: Stratigraphy;    Glacigenic;    Inter-till sediments;    Sub-weichselian sediments;    Optically stimulated luminescence;    Saalian ice age;   

DOI  :  

来源: DOAJ

【 摘 要 】

During successive Pleistocene ice ages, Finnish Lapland lay under the cold-based centre of the Fennoscandian Ice Sheet (FIS). This area largely escaped deep glacial erosion by the fast-flowing wet-based ice streams that developed toward the periphery of successive ice sheets. Low erosion is evident from the preservation of Neogene weathered bedrock and a significant record of tills of the pre-Weichselian sediments. To date, some 250 locations are known where sediments occur beneath and within last glaciation deposits (Weichselian). An ongoing challenge is to determine absolute ages for old sediments and to establish regional stratigraphic correlations from one site to another. At Äältövittikot, lacustrine silts and rippled sands are found as rafts and inter-till layers within the Weichelian tills. The results indicate an age range of 190–235 ka identifying a likely MIS 7 age i.e., an early or mid Saalian Stage for the older sediments and a couple of younger OSL ages representing Weichselian interstadials as an indication for the multiphase deposition of the Äältövittikot sediment complex. Overlying Weichselian tills contain large amounts of glaciotectonically-deformed and reworked Saalian material. The reworking of Saalian sediment in an up-ice position from the headward erosion zone of the Salla ice stream is important for understanding the polycyclic origins of tills found in similar locations and for interpretation of tracer minerals found in mineral exploration surveys in similar glaciated terrains.

【 授权许可】

Unknown