The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland
We present ground-penetrating radar (GPR) profiles that reveal the sedimentary architecture of an esker deposited during a surge-associated outburst flood at the Bering Glacier, Alaska. The wide, up-flow end of the esker contains a transition from large backset beds to large foreset beds interpreted...
Published in: | Geological Society of America Bulletin |
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Geological Society of America
2010
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Online Access: | https://nrl.northumbria.ac.uk/id/eprint/1835/ https://doi.org/10.1130/B30008.1 |
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ftunivnorthumb:oai:nrl.northumbria.ac.uk:1835 2023-05-15T16:20:28+02:00 The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland Burke, Matthew John Woodward, John Russell, Andrew J. 2010-05 https://nrl.northumbria.ac.uk/id/eprint/1835/ https://doi.org/10.1130/B30008.1 en eng Geological Society of America Burke, Matthew John, Woodward, John and Russell, Andrew J. (2010) The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland. Geological Society of America Bulletin, 122 (9-10). pp. 1637-1645. ISSN 0016-7606 F600 Geology Article PeerReviewed 2010 ftunivnorthumb https://doi.org/10.1130/B30008.1 2022-09-25T05:50:47Z We present ground-penetrating radar (GPR) profiles that reveal the sedimentary architecture of an esker deposited during a surge-associated outburst flood at the Bering Glacier, Alaska. The wide, up-flow end of the esker contains a transition from large backset beds to large foreset beds interpreted to reflect composite macroform development in an enlarged part of the conduit. By contrast, the narrow, down-flow portion of the esker is dominated by plane beds interpreted to have been deposited where the conduit was constricted and the flow was faster. A previously studied outburst esker at Skeidarárjökull, Iceland, has a similar morphology and stratigraphic architecture. This suggests that outburst floods generate distinct depositional signatures in eskers, both in terms of morphology and sedimentary architecture. Identification of these distinct signatures in ancient eskers will help assess the paleohydraulic conditions under which ancient eskers formed and, by extension, the nature of meltwater drainage systems beneath the Laurentide and Eurasian ice sheets. Article in Journal/Newspaper glacier glacier Iceland Alaska Northumbria University, Newcastle: Northumbria Research Link (NRL) Geological Society of America Bulletin 122 9-10 1637 1645 |
institution |
Open Polar |
collection |
Northumbria University, Newcastle: Northumbria Research Link (NRL) |
op_collection_id |
ftunivnorthumb |
language |
English |
topic |
F600 Geology |
spellingShingle |
F600 Geology Burke, Matthew John Woodward, John Russell, Andrew J. The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland |
topic_facet |
F600 Geology |
description |
We present ground-penetrating radar (GPR) profiles that reveal the sedimentary architecture of an esker deposited during a surge-associated outburst flood at the Bering Glacier, Alaska. The wide, up-flow end of the esker contains a transition from large backset beds to large foreset beds interpreted to reflect composite macroform development in an enlarged part of the conduit. By contrast, the narrow, down-flow portion of the esker is dominated by plane beds interpreted to have been deposited where the conduit was constricted and the flow was faster. A previously studied outburst esker at Skeidarárjökull, Iceland, has a similar morphology and stratigraphic architecture. This suggests that outburst floods generate distinct depositional signatures in eskers, both in terms of morphology and sedimentary architecture. Identification of these distinct signatures in ancient eskers will help assess the paleohydraulic conditions under which ancient eskers formed and, by extension, the nature of meltwater drainage systems beneath the Laurentide and Eurasian ice sheets. |
format |
Article in Journal/Newspaper |
author |
Burke, Matthew John Woodward, John Russell, Andrew J. |
author_facet |
Burke, Matthew John Woodward, John Russell, Andrew J. |
author_sort |
Burke, Matthew John |
title |
The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland |
title_short |
The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland |
title_full |
The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland |
title_fullStr |
The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland |
title_full_unstemmed |
The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland |
title_sort |
sedimentary architecture of outburst flood eskers: a comparison of ground-penetrating radar data from bering glacier, alaska and skeidarárjökull, iceland |
publisher |
Geological Society of America |
publishDate |
2010 |
url |
https://nrl.northumbria.ac.uk/id/eprint/1835/ https://doi.org/10.1130/B30008.1 |
genre |
glacier glacier Iceland Alaska |
genre_facet |
glacier glacier Iceland Alaska |
op_relation |
Burke, Matthew John, Woodward, John and Russell, Andrew J. (2010) The sedimentary architecture of outburst flood eskers: A comparison of ground-penetrating radar data from Bering Glacier, Alaska and Skeidarárjökull, Iceland. Geological Society of America Bulletin, 122 (9-10). pp. 1637-1645. ISSN 0016-7606 |
op_doi |
https://doi.org/10.1130/B30008.1 |
container_title |
Geological Society of America Bulletin |
container_volume |
122 |
container_issue |
9-10 |
container_start_page |
1637 |
op_container_end_page |
1645 |
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1766008383453790208 |