Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet
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...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/340643 2024-01-07T09:43:12+01:00 Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet Putkinen, Niko Sarala, Pertti Eyles, Nick Daxberger, Heidi Pihlaja, Jouni Murray, Andrew Department of Geosciences and Geography 2022-02-18T12:25:01Z 9 application/pdf http://hdl.handle.net/10138/340643 eng eng Elsevier Ltd. 10.1016/j.qsa.2020.100005 Authors want to thank the Geological Survey of Finland for providing financial support to field work and OSL dating, and Mr. Jorma Valkama, Mr. Kalervo Rauhala and Mr. Lassi Rauhala for assistance during the field work. We thank Mr. Harri Kutvonen for valued artworks. Prof. Wojciech Wysota and Dr. Adrian Hall are thanked for constructive comments on the earlier version of manuscript. Authors want also acknowledge two anonymous reviewers for the comments and critisism concerning present version of the manuscript. NE thanks the Natural Sciences and Engineering Research Council of Canada for funding. 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 85097334170 ad762291-5242-49ee-bc66-5d20efb560d1 http://hdl.handle.net/10138/340643 cc_by openAccess info:eu-repo/semantics/openAccess 1171 Geosciences Article publishedVersion 2022 ftunivhelsihelda 2023-12-14T00:03:48Z 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. Peer reviewed Article in Journal/Newspaper Fennoscandian Ice Sheet Salla Lapland HELDA – University of Helsinki Open Repository Salla ENVELOPE(28.667,28.667,66.833,66.833) Quaternary Science Advances 2 100005 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
1171 Geosciences |
spellingShingle |
1171 Geosciences Putkinen, Niko Sarala, Pertti Eyles, Nick Daxberger, Heidi Pihlaja, Jouni Murray, Andrew Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet |
topic_facet |
1171 Geosciences |
description |
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. Peer reviewed |
author2 |
Department of Geosciences and Geography |
format |
Article in Journal/Newspaper |
author |
Putkinen, Niko Sarala, Pertti Eyles, Nick Daxberger, Heidi Pihlaja, Jouni Murray, Andrew |
author_facet |
Putkinen, Niko Sarala, Pertti Eyles, Nick Daxberger, Heidi Pihlaja, Jouni Murray, Andrew |
author_sort |
Putkinen, Niko |
title |
Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet |
title_short |
Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet |
title_full |
Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet |
title_fullStr |
Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet |
title_full_unstemmed |
Reworked Middle Pleistocene deposits preserved in the core region of the Fennoscandian Ice Sheet |
title_sort |
reworked middle pleistocene deposits preserved in the core region of the fennoscandian ice sheet |
publisher |
Elsevier Ltd. |
publishDate |
2022 |
url |
http://hdl.handle.net/10138/340643 |
long_lat |
ENVELOPE(28.667,28.667,66.833,66.833) |
geographic |
Salla |
geographic_facet |
Salla |
genre |
Fennoscandian Ice Sheet Salla Lapland |
genre_facet |
Fennoscandian Ice Sheet Salla Lapland |
op_relation |
10.1016/j.qsa.2020.100005 Authors want to thank the Geological Survey of Finland for providing financial support to field work and OSL dating, and Mr. Jorma Valkama, Mr. Kalervo Rauhala and Mr. Lassi Rauhala for assistance during the field work. We thank Mr. Harri Kutvonen for valued artworks. Prof. Wojciech Wysota and Dr. Adrian Hall are thanked for constructive comments on the earlier version of manuscript. Authors want also acknowledge two anonymous reviewers for the comments and critisism concerning present version of the manuscript. NE thanks the Natural Sciences and Engineering Research Council of Canada for funding. 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 85097334170 ad762291-5242-49ee-bc66-5d20efb560d1 http://hdl.handle.net/10138/340643 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
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