Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway
This study presents the sedimentary succession of an outwash plain and an alluvial fan located along the valley Langedalen at the south-eastern side of the Jostedalsbreen ice cap in inner Sogn, western Norway. A newly exposed ~2.8-m-high section along the southern riverbank of Langedøla river shows...
Published in: | Boreas |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2022
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/3060392 https://doi.org/10.1111/bor.12608 |
id |
fthsvestlandet:oai:hvlopen.brage.unit.no:11250/3060392 |
---|---|
record_format |
openpolar |
spelling |
fthsvestlandet:oai:hvlopen.brage.unit.no:11250/3060392 2024-03-03T08:44:38+00:00 Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway Nesje, Atle Rüther, Denise Christina Yde, Jacob C. 2022 application/pdf https://hdl.handle.net/11250/3060392 https://doi.org/10.1111/bor.12608 eng eng Wiley Boreas. 2022, 1-12. urn:issn:0300-9483 https://hdl.handle.net/11250/3060392 https://doi.org/10.1111/bor.12608 cristin:2076250 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2022 The Authors 1-12 Boreas Peer reviewed Journal article 2022 fthsvestlandet https://doi.org/10.1111/bor.12608 2024-02-02T12:41:09Z This study presents the sedimentary succession of an outwash plain and an alluvial fan located along the valley Langedalen at the south-eastern side of the Jostedalsbreen ice cap in inner Sogn, western Norway. A newly exposed ~2.8-m-high section along the southern riverbank of Langedøla river shows alternating layers of minerogenic sediments and peat layers with tree logs, identified as Salix sp. The section is situated in the distal part of an alluvial fan built out from the southern slope of Langedalen. Six AMS radiocarbon dates of tree fragments indicate that the accumulation of the fine-grained sediments in the lower part of the section was initiated earlier than the basal radiocarbon date of 914–976 calibrated years CE (1σ age range). These basal, fine-grained sediments are interpreted as proglacial outwash deposited in a floodplain depression or abandoned river channel in a low-energy glaciofluvial environment. Periods of low glacier cover, low river discharge or low-water stands over the floodplain allowed peat formation and the growth of trees and shrubs in the valley. The radiocarbon dates further indicate relatively rapid sediment accretion (~2.7–3 cm a−1) between 190 and 125 cm below the sediment surface, equivalent to approximately 1220 to 1250 cal. a CE (1σ age range). At ~60 cm depth below the surface, dated to approximately 1590 to 1620 cal. a CE (1σ age range), a transition to more coarse-grained, sandy and gravelly sediments indicates increased sediment supply and distal expansion of the alluvial fan. This occurred most likely as a consequence of increased sediment yield from expanding glaciers along the southern valley side of Langedalen as a response to the initial Little Ice Age glacier growth. Based on these results, the accretion and progradation of glacier-fed alluvial fans mainly occur during periods of glacier advance rather than during glacier recession. publishedVersion Article in Journal/Newspaper glacier Ice cap Høgskulen på Vestlandet: HVL Open Norway Sogn ENVELOPE(-21.133,-21.133,63.994,63.994) Boreas 52 2 194 205 |
institution |
Open Polar |
collection |
Høgskulen på Vestlandet: HVL Open |
op_collection_id |
fthsvestlandet |
language |
English |
description |
This study presents the sedimentary succession of an outwash plain and an alluvial fan located along the valley Langedalen at the south-eastern side of the Jostedalsbreen ice cap in inner Sogn, western Norway. A newly exposed ~2.8-m-high section along the southern riverbank of Langedøla river shows alternating layers of minerogenic sediments and peat layers with tree logs, identified as Salix sp. The section is situated in the distal part of an alluvial fan built out from the southern slope of Langedalen. Six AMS radiocarbon dates of tree fragments indicate that the accumulation of the fine-grained sediments in the lower part of the section was initiated earlier than the basal radiocarbon date of 914–976 calibrated years CE (1σ age range). These basal, fine-grained sediments are interpreted as proglacial outwash deposited in a floodplain depression or abandoned river channel in a low-energy glaciofluvial environment. Periods of low glacier cover, low river discharge or low-water stands over the floodplain allowed peat formation and the growth of trees and shrubs in the valley. The radiocarbon dates further indicate relatively rapid sediment accretion (~2.7–3 cm a−1) between 190 and 125 cm below the sediment surface, equivalent to approximately 1220 to 1250 cal. a CE (1σ age range). At ~60 cm depth below the surface, dated to approximately 1590 to 1620 cal. a CE (1σ age range), a transition to more coarse-grained, sandy and gravelly sediments indicates increased sediment supply and distal expansion of the alluvial fan. This occurred most likely as a consequence of increased sediment yield from expanding glaciers along the southern valley side of Langedalen as a response to the initial Little Ice Age glacier growth. Based on these results, the accretion and progradation of glacier-fed alluvial fans mainly occur during periods of glacier advance rather than during glacier recession. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Nesje, Atle Rüther, Denise Christina Yde, Jacob C. |
spellingShingle |
Nesje, Atle Rüther, Denise Christina Yde, Jacob C. Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway |
author_facet |
Nesje, Atle Rüther, Denise Christina Yde, Jacob C. |
author_sort |
Nesje, Atle |
title |
Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway |
title_short |
Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway |
title_full |
Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway |
title_fullStr |
Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway |
title_full_unstemmed |
Stratigraphy and age of a Neoglacial sedimentary succession of proglacial outwash and an alluvial fan in Langedalen, Veitastrond, western Norway |
title_sort |
stratigraphy and age of a neoglacial sedimentary succession of proglacial outwash and an alluvial fan in langedalen, veitastrond, western norway |
publisher |
Wiley |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3060392 https://doi.org/10.1111/bor.12608 |
long_lat |
ENVELOPE(-21.133,-21.133,63.994,63.994) |
geographic |
Norway Sogn |
geographic_facet |
Norway Sogn |
genre |
glacier Ice cap |
genre_facet |
glacier Ice cap |
op_source |
1-12 Boreas |
op_relation |
Boreas. 2022, 1-12. urn:issn:0300-9483 https://hdl.handle.net/11250/3060392 https://doi.org/10.1111/bor.12608 cristin:2076250 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2022 The Authors |
op_doi |
https://doi.org/10.1111/bor.12608 |
container_title |
Boreas |
container_volume |
52 |
container_issue |
2 |
container_start_page |
194 |
op_container_end_page |
205 |
_version_ |
1792500128893894656 |