Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea
Glacial deposits and landforms, interpreted from the continuous seismic reflection data, have been used to reconstruct the Late Weichselian ice‐sheet dynamics and the sedimentary environments in the northeastern Baltic Sea. The bedrock geology and topography played an important role in the glacial d...
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crwiley:10.1111/j.1502-3885.2002.tb01054.x 2024-06-02T08:08:14+00:00 Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea NOORMETS, RIKO FLODÉN, TOM 2002 http://dx.doi.org/10.1111/j.1502-3885.2002.tb01054.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2002.tb01054.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2002.tb01054.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Boreas volume 31, issue 1, page 36-56 ISSN 0300-9483 1502-3885 journal-article 2002 crwiley https://doi.org/10.1111/j.1502-3885.2002.tb01054.x 2024-05-03T11:04:51Z Glacial deposits and landforms, interpreted from the continuous seismic reflection data, have been used to reconstruct the Late Weichselian ice‐sheet dynamics and the sedimentary environments in the northeastern Baltic Sea. The bedrock geology and topography played an important role in the glacial dynamics and subglacial meltwater drainage in the area. Drumlins suggest a south‐southeasterly flow direction of the last ice sheet on the Ordovician Plateau. Eskers demonstrate that subglacial meltwater flow was focused mostly within bedrock valleys. The eskers have locally been overlain by a thin layer of till. Thick proximal outwash deposits occupy elongated depressions in the substratum, which often occur along the sides of esker ridges. Ice‐marginal grounding‐line deposit in the southern part of the area has a continuation on the adjacent Island of Saaremaa. Therefore, we assume that its formation took place during Palivere Stadial of the last deglaciation, whereas the moraine bank extending southwestward from the Serve Peninsula is tentatively correlated with the Pandivere Stadial. The wedge‐shaped ice‐marginal grounding‐line deposit was locally fed by subglacial meltwater streams during a standstill or slight readvance of the ice margin. The thickness of the glacier at the grounding‐line was estimated to reach approximately 180 m. In the western part of the area, terrace‐like morphology of the ice‐marginal deposit and series of small retreat moraines 10–20 km north of it suggest stepwise retreat of the ice margin. Therefore, a rather thin and mobile ice stream was probably covering the northeastern Baltic Sea during the last deglaciation. Article in Journal/Newspaper Ice Sheet Wiley Online Library Boreas 31 1 36 56 |
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English |
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Glacial deposits and landforms, interpreted from the continuous seismic reflection data, have been used to reconstruct the Late Weichselian ice‐sheet dynamics and the sedimentary environments in the northeastern Baltic Sea. The bedrock geology and topography played an important role in the glacial dynamics and subglacial meltwater drainage in the area. Drumlins suggest a south‐southeasterly flow direction of the last ice sheet on the Ordovician Plateau. Eskers demonstrate that subglacial meltwater flow was focused mostly within bedrock valleys. The eskers have locally been overlain by a thin layer of till. Thick proximal outwash deposits occupy elongated depressions in the substratum, which often occur along the sides of esker ridges. Ice‐marginal grounding‐line deposit in the southern part of the area has a continuation on the adjacent Island of Saaremaa. Therefore, we assume that its formation took place during Palivere Stadial of the last deglaciation, whereas the moraine bank extending southwestward from the Serve Peninsula is tentatively correlated with the Pandivere Stadial. The wedge‐shaped ice‐marginal grounding‐line deposit was locally fed by subglacial meltwater streams during a standstill or slight readvance of the ice margin. The thickness of the glacier at the grounding‐line was estimated to reach approximately 180 m. In the western part of the area, terrace‐like morphology of the ice‐marginal deposit and series of small retreat moraines 10–20 km north of it suggest stepwise retreat of the ice margin. Therefore, a rather thin and mobile ice stream was probably covering the northeastern Baltic Sea during the last deglaciation. |
format |
Article in Journal/Newspaper |
author |
NOORMETS, RIKO FLODÉN, TOM |
spellingShingle |
NOORMETS, RIKO FLODÉN, TOM Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea |
author_facet |
NOORMETS, RIKO FLODÉN, TOM |
author_sort |
NOORMETS, RIKO |
title |
Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea |
title_short |
Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea |
title_full |
Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea |
title_fullStr |
Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea |
title_full_unstemmed |
Glacial deposits and Late Weichselian ice‐sheet dynamics in the northeastern Baltic Sea |
title_sort |
glacial deposits and late weichselian ice‐sheet dynamics in the northeastern baltic sea |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1111/j.1502-3885.2002.tb01054.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2002.tb01054.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2002.tb01054.x |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Boreas volume 31, issue 1, page 36-56 ISSN 0300-9483 1502-3885 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1502-3885.2002.tb01054.x |
container_title |
Boreas |
container_volume |
31 |
container_issue |
1 |
container_start_page |
36 |
op_container_end_page |
56 |
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1800753425039753216 |