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

Show full item record



Permalink

http://hdl.handle.net/10138/340643

Citation

Putkinen , N , Sarala , P , Eyles , N , Daxberger , H , Pihlaja , J & Murray , A 2020 , ' Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet ' , Quaternary Science Advances , vol. 2 , 100005 . https://doi.org/10.1016/j.qsa.2020.100005

Title: Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet
Author: Putkinen, Niko; Sarala, Pertti; Eyles, Nick; Daxberger, Heidi; Pihlaja, Jouni; Murray, Andrew
Contributor organization: Department of Geosciences and Geography
Date: 2020-10
Language: eng
Number of pages: 9
Belongs to series: Quaternary Science Advances
ISSN: 2666-0334
DOI: https://doi.org/10.1016/j.qsa.2020.100005
URI: http://hdl.handle.net/10138/340643
Abstract: 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.
Description: Publisher Copyright: © 2020 The Authors
Subject: 1171 Geosciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


Files in this item

Total number of downloads: Loading...

Files Size Format View
1_s2.0_S2666033420300058_main.pdf 3.937Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record