The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya
Surface exposure dating via 10Be cosmogenic nuclide dating is used, alongside Quaternary geological mapping of landforms and sediments, to reconstruct the course of deglaciation following the Late Weichselian Glacial Maximum in Kongsfjorden, northwest Spitsbergen, Svalbard. Kongsfjorden hosted a fas...
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The University of Bergen
2016
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ftunivbergen:oai:bora.uib.no:1956/12576 2023-05-15T15:39:11+02:00 The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya Grant, Oliver Rodney 2016-05-27 21142292 bytes application/pdf https://hdl.handle.net/1956/12576 eng eng The University of Bergen https://hdl.handle.net/1956/12576 Copyright the Author. All rights reserved Quaternary Geology Deglaciation Kongsfjorden Svalbard Cosmogenic Nuclide Dating Beryllium 10Be Exposure Ice Stream Paleoclimate 756199 Master thesis 2016 ftunivbergen 2023-03-14T17:40:31Z Surface exposure dating via 10Be cosmogenic nuclide dating is used, alongside Quaternary geological mapping of landforms and sediments, to reconstruct the course of deglaciation following the Late Weichselian Glacial Maximum in Kongsfjorden, northwest Spitsbergen, Svalbard. Kongsfjorden hosted a fast-flowing paleo-Ice Stream at the Last Glacial Maximum, draining an ice dome over northwest Spitsbergen. One research aim is to resolve the nature of glacial retreat in the fjord, questioning whether it was a rapid collapse of the ice stream. A secondary objective is to couple the nature of retreat to the dynamic behaviour of the Svalbard-Barents Sea Ice Sheet during deglaciation. Blomstrandhalvøya is a ca. 16 km2 island close to the centre of Kongsfjorden, and can be considered a large roche moutonnée, overridden during repeated glacial advances toward the shelf-edge west of Kongsfjorden through the Quaternary. The island provides an ideal location to study landforms and sediments associated with the Late Weichselian glaciation and subsequent Holocene interglacial period. Detailed mapping reveals a periglacial dominated landscape development through the Holocene, with the north and east of the island affected by the Little Ice Age glacial advance and 20th Century surge activity of Blomstrandbreen. Surface exposure dating of glacial erratics on Blomstrandhalvøya shows the initiation of retreat at ca. 15.6 ka, and continued lateral retreat through the Bølling-Allerød. A trimline-moraine complex observed on the southeast of the island yields a mid-Younger Dryas exposure age, and a number of samples produce similar ages below the trimline elevation, it is thus suggested that the trimline-moraine complex represents a Younger Dryas ice marginal position in the fjord. This is consistent with previous reconstructions in western Spitsbergen which show a suppressed marine limit through the Younger Dryas. The secondary field area, Ossian Sarsfjellet at the head of the fjord, reveals deglaciation ages within the Younger Dryas, ... Master Thesis Barents Sea Ice Sheet Ice Stream A Kongsfjord* Kongsfjorden Sea ice Svalbard Svalbard-Barents Sea Ice sheet Spitsbergen University of Bergen: Bergen Open Research Archive (BORA-UiB) Barents Sea Blomstrandbreen ENVELOPE(12.167,12.167,79.033,79.033) Blomstrandhalvøya ENVELOPE(12.105,12.105,78.976,78.976) Ossian Sarsfjellet ENVELOPE(12.477,12.477,78.943,78.943) Svalbard |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Quaternary Geology Deglaciation Kongsfjorden Svalbard Cosmogenic Nuclide Dating Beryllium 10Be Exposure Ice Stream Paleoclimate 756199 |
spellingShingle |
Quaternary Geology Deglaciation Kongsfjorden Svalbard Cosmogenic Nuclide Dating Beryllium 10Be Exposure Ice Stream Paleoclimate 756199 Grant, Oliver Rodney The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya |
topic_facet |
Quaternary Geology Deglaciation Kongsfjorden Svalbard Cosmogenic Nuclide Dating Beryllium 10Be Exposure Ice Stream Paleoclimate 756199 |
description |
Surface exposure dating via 10Be cosmogenic nuclide dating is used, alongside Quaternary geological mapping of landforms and sediments, to reconstruct the course of deglaciation following the Late Weichselian Glacial Maximum in Kongsfjorden, northwest Spitsbergen, Svalbard. Kongsfjorden hosted a fast-flowing paleo-Ice Stream at the Last Glacial Maximum, draining an ice dome over northwest Spitsbergen. One research aim is to resolve the nature of glacial retreat in the fjord, questioning whether it was a rapid collapse of the ice stream. A secondary objective is to couple the nature of retreat to the dynamic behaviour of the Svalbard-Barents Sea Ice Sheet during deglaciation. Blomstrandhalvøya is a ca. 16 km2 island close to the centre of Kongsfjorden, and can be considered a large roche moutonnée, overridden during repeated glacial advances toward the shelf-edge west of Kongsfjorden through the Quaternary. The island provides an ideal location to study landforms and sediments associated with the Late Weichselian glaciation and subsequent Holocene interglacial period. Detailed mapping reveals a periglacial dominated landscape development through the Holocene, with the north and east of the island affected by the Little Ice Age glacial advance and 20th Century surge activity of Blomstrandbreen. Surface exposure dating of glacial erratics on Blomstrandhalvøya shows the initiation of retreat at ca. 15.6 ka, and continued lateral retreat through the Bølling-Allerød. A trimline-moraine complex observed on the southeast of the island yields a mid-Younger Dryas exposure age, and a number of samples produce similar ages below the trimline elevation, it is thus suggested that the trimline-moraine complex represents a Younger Dryas ice marginal position in the fjord. This is consistent with previous reconstructions in western Spitsbergen which show a suppressed marine limit through the Younger Dryas. The secondary field area, Ossian Sarsfjellet at the head of the fjord, reveals deglaciation ages within the Younger Dryas, ... |
format |
Master Thesis |
author |
Grant, Oliver Rodney |
author_facet |
Grant, Oliver Rodney |
author_sort |
Grant, Oliver Rodney |
title |
The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya |
title_short |
The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya |
title_full |
The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya |
title_fullStr |
The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya |
title_full_unstemmed |
The deglaciation of Kongsfjorden, Svalbard —based on surface exposure dating of glacial erratics and Quaternary geological mapping of Blomstrandhalvøya |
title_sort |
deglaciation of kongsfjorden, svalbard —based on surface exposure dating of glacial erratics and quaternary geological mapping of blomstrandhalvøya |
publisher |
The University of Bergen |
publishDate |
2016 |
url |
https://hdl.handle.net/1956/12576 |
long_lat |
ENVELOPE(12.167,12.167,79.033,79.033) ENVELOPE(12.105,12.105,78.976,78.976) ENVELOPE(12.477,12.477,78.943,78.943) |
geographic |
Barents Sea Blomstrandbreen Blomstrandhalvøya Ossian Sarsfjellet Svalbard |
geographic_facet |
Barents Sea Blomstrandbreen Blomstrandhalvøya Ossian Sarsfjellet Svalbard |
genre |
Barents Sea Ice Sheet Ice Stream A Kongsfjord* Kongsfjorden Sea ice Svalbard Svalbard-Barents Sea Ice sheet Spitsbergen |
genre_facet |
Barents Sea Ice Sheet Ice Stream A Kongsfjord* Kongsfjorden Sea ice Svalbard Svalbard-Barents Sea Ice sheet Spitsbergen |
op_relation |
https://hdl.handle.net/1956/12576 |
op_rights |
Copyright the Author. All rights reserved |
_version_ |
1766370645709422592 |