A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation.
The Fiskarheden quarry, situated in NW Dalarna, central Sweden, reveals thick coarse-grained sediments of Scott type facies association representing a sandur deposited in an ice-proximal proglacial environment. Optically Stimulated Luminescence (OSL) dating of the sandur sediments suggests a pre-Las...
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Language: | English |
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John Wiley & Sons Inc.
2018
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Online Access: | https://lup.lub.lu.se/record/75b468dc-a511-487b-9e87-c6366ab1458c https://doi.org/10.1111/bor.12301 |
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ftulundlup:oai:lup.lub.lu.se:75b468dc-a511-487b-9e87-c6366ab1458c 2023-05-15T16:41:24+02:00 A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. Flindt, Anne-Cecille Alexanderson, Helena Benediktsson, Ivar Örn Möller, Per 2018-07 https://lup.lub.lu.se/record/75b468dc-a511-487b-9e87-c6366ab1458c https://doi.org/10.1111/bor.12301 eng eng John Wiley & Sons Inc. https://lup.lub.lu.se/record/75b468dc-a511-487b-9e87-c6366ab1458c http://dx.doi.org/10.1111/bor.12301 scopus:85040612330 Boreas; 47(3), pp 711-737 (2018) ISSN: 1502-3885 Geology contributiontojournal/article info:eu-repo/semantics/article text 2018 ftulundlup https://doi.org/10.1111/bor.12301 2023-02-01T23:34:36Z The Fiskarheden quarry, situated in NW Dalarna, central Sweden, reveals thick coarse-grained sediments of Scott type facies association representing a sandur deposited in an ice-proximal proglacial environment. Optically Stimulated Luminescence (OSL) dating of the sandur sediments suggests a pre-Last Glacial Maximum (LGM) age. Most acquired ages are pre-Saalian (>200 ka) and we regard each of these ages to represent non/poorly bleached sediment except for one small-aliquot OSL age of 98±6 ka. This age comes from the top surface of an arguably well-bleached sand bed deposited on the lee-side of a braid-bar, putting the sandur build-up into the Early Weichselian. Large-scale glaciotectonic structures show an imbricate thrust fan involving both ductile and brittle deformation. The deformation was from the WNW, which largely coincides with the formative trend of the predominating streamlined terrain and Rogen moraine tracts surrounding Fiskarheden. It is suggested that the deformation of the sandur sediments took place when the advancing glacier approached and pushed its own proglacial outwash sediment, during an ice-marginal oscillation either at the inception of one of the Early Weichselian glaciations in the area, or during a general ice retreat amid a deglacial phase. The Fiskarheden sandur deposits are covered by a subglacial traction till deposited from the NE/NNE. This direction corresponds with younger streamlined terrain flowsets cross-cutting the older NNW–SSE system and probably represents deglaciation in the area following the LGM. This study will add to the understanding of the formation and deformation of Pleistocene sandur successions and their relationship to past ice-sheet behaviour. Article in Journal/Newspaper Ice Sheet Lund University Publications (LUP) Rogen ENVELOPE(7.502,7.502,63.052,63.052) Boreas 47 3 711 737 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geology |
spellingShingle |
Geology Flindt, Anne-Cecille Alexanderson, Helena Benediktsson, Ivar Örn Möller, Per A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. |
topic_facet |
Geology |
description |
The Fiskarheden quarry, situated in NW Dalarna, central Sweden, reveals thick coarse-grained sediments of Scott type facies association representing a sandur deposited in an ice-proximal proglacial environment. Optically Stimulated Luminescence (OSL) dating of the sandur sediments suggests a pre-Last Glacial Maximum (LGM) age. Most acquired ages are pre-Saalian (>200 ka) and we regard each of these ages to represent non/poorly bleached sediment except for one small-aliquot OSL age of 98±6 ka. This age comes from the top surface of an arguably well-bleached sand bed deposited on the lee-side of a braid-bar, putting the sandur build-up into the Early Weichselian. Large-scale glaciotectonic structures show an imbricate thrust fan involving both ductile and brittle deformation. The deformation was from the WNW, which largely coincides with the formative trend of the predominating streamlined terrain and Rogen moraine tracts surrounding Fiskarheden. It is suggested that the deformation of the sandur sediments took place when the advancing glacier approached and pushed its own proglacial outwash sediment, during an ice-marginal oscillation either at the inception of one of the Early Weichselian glaciations in the area, or during a general ice retreat amid a deglacial phase. The Fiskarheden sandur deposits are covered by a subglacial traction till deposited from the NE/NNE. This direction corresponds with younger streamlined terrain flowsets cross-cutting the older NNW–SSE system and probably represents deglaciation in the area following the LGM. This study will add to the understanding of the formation and deformation of Pleistocene sandur successions and their relationship to past ice-sheet behaviour. |
format |
Article in Journal/Newspaper |
author |
Flindt, Anne-Cecille Alexanderson, Helena Benediktsson, Ivar Örn Möller, Per |
author_facet |
Flindt, Anne-Cecille Alexanderson, Helena Benediktsson, Ivar Örn Möller, Per |
author_sort |
Flindt, Anne-Cecille |
title |
A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. |
title_short |
A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. |
title_full |
A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. |
title_fullStr |
A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. |
title_full_unstemmed |
A pre-LGM sandur at Fiskarheden in NW Dalarna, Sweden – sedimentology and glaciotectonic deformation. |
title_sort |
pre-lgm sandur at fiskarheden in nw dalarna, sweden – sedimentology and glaciotectonic deformation. |
publisher |
John Wiley & Sons Inc. |
publishDate |
2018 |
url |
https://lup.lub.lu.se/record/75b468dc-a511-487b-9e87-c6366ab1458c https://doi.org/10.1111/bor.12301 |
long_lat |
ENVELOPE(7.502,7.502,63.052,63.052) |
geographic |
Rogen |
geographic_facet |
Rogen |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Boreas; 47(3), pp 711-737 (2018) ISSN: 1502-3885 |
op_relation |
https://lup.lub.lu.se/record/75b468dc-a511-487b-9e87-c6366ab1458c http://dx.doi.org/10.1111/bor.12301 scopus:85040612330 |
op_doi |
https://doi.org/10.1111/bor.12301 |
container_title |
Boreas |
container_volume |
47 |
container_issue |
3 |
container_start_page |
711 |
op_container_end_page |
737 |
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1766031826335301632 |