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...
Published in: | Quaternary Science Advances |
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2020
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ftuniaarhuspubl:oai:pure.atira.dk:publications/cd690376-5336-481c-a273-ef3f6d9fc309 2024-05-19T07:40:12+00:00 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 2020-10 https://pure.au.dk/portal/en/publications/cd690376-5336-481c-a273-ef3f6d9fc309 https://doi.org/10.1016/j.qsa.2020.100005 http://www.scopus.com/inward/record.url?scp=85097334170&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/cd690376-5336-481c-a273-ef3f6d9fc309 info:eu-repo/semantics/openAccess 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 Finnish lapland Glacigenic Inter-till sediments Mineral exploration Optically stimulated luminescence Saalian ice age Stratigraphy Sub-weichselian sediments article 2020 ftuniaarhuspubl https://doi.org/10.1016/j.qsa.2020.100005 2024-05-01T23:48:43Z 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. Article in Journal/Newspaper Fennoscandian Ice Sheet Salla Lapland Aarhus University: Research Quaternary Science Advances 2 100005 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Finnish lapland Glacigenic Inter-till sediments Mineral exploration Optically stimulated luminescence Saalian ice age Stratigraphy Sub-weichselian sediments |
spellingShingle |
Finnish lapland Glacigenic Inter-till sediments Mineral exploration Optically stimulated luminescence Saalian ice age Stratigraphy Sub-weichselian sediments 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 |
Finnish lapland Glacigenic Inter-till sediments Mineral exploration Optically stimulated luminescence Saalian ice age Stratigraphy Sub-weichselian sediments |
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. |
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 |
publishDate |
2020 |
url |
https://pure.au.dk/portal/en/publications/cd690376-5336-481c-a273-ef3f6d9fc309 https://doi.org/10.1016/j.qsa.2020.100005 http://www.scopus.com/inward/record.url?scp=85097334170&partnerID=8YFLogxK |
genre |
Fennoscandian Ice Sheet Salla Lapland |
genre_facet |
Fennoscandian Ice Sheet Salla Lapland |
op_source |
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 |
op_relation |
https://pure.au.dk/portal/en/publications/cd690376-5336-481c-a273-ef3f6d9fc309 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.qsa.2020.100005 |
container_title |
Quaternary Science Advances |
container_volume |
2 |
container_start_page |
100005 |
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1799479769735102464 |