Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record
ABSTRACT Lake sediment records give valuable insight into the dynamic events that characterized the last deglaciation in Iceland. Here, we focus on the well‐dated sediment record from Hestvatn, a low‐elevation lake in south Iceland, that features six graded bedding events deposited by outburst flood...
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crwiley:10.1002/jqs.3344 2024-06-02T08:07:04+00:00 Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record Geirsdóttir, Áslaug Miller, Gifford H. Harning, David J. Hannesdóttir, Hrafnhildur Thordarson, Thor Jónsdóttir, Ingibjörg National Science Foundation 2021 http://dx.doi.org/10.1002/jqs.3344 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3344 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3344 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/jqs.3344 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 37, issue 5, page 1006-1023 ISSN 0267-8179 1099-1417 journal-article 2021 crwiley https://doi.org/10.1002/jqs.3344 2024-05-06T07:00:53Z ABSTRACT Lake sediment records give valuable insight into the dynamic events that characterized the last deglaciation in Iceland. Here, we focus on the well‐dated sediment record from Hestvatn, a low‐elevation lake in south Iceland, that features six graded bedding events deposited by outburst floods from glacial lakes dammed by the decaying Iceland Ice Sheet (IIS) in the time period of the Vedde Ash and the G10ka Series tephra. Using climate proxies preserved in the sediment cores, in conjunction with regional glacial geomorphology, we reconstruct the retreat of the IIS in south Iceland, from a marine‐based glacier during the Younger Dryas to a land‐based glacier during the Preboreal. As the ice sheet margin withdrew to the central highlands, ice‐dammed lakes formed along glacier margins. The ice‐dams were occasionally breached, generating large‐scale jökulhlaups (catastrophic outburst floods) that deposited thick turbidite sequences preserved in the sediment record of Hestvatn. The high concentration of volcanic material incorporated within deglacial sediments indicates that along with IIS retreat, subglacial volcanic activity may have helped initiate some of the jökulhlaups. Onset of more stable Holocene conditions was reached after the final turbidite at ~10 ka bp , when the IIS had withdrawn from most of the highlands of Iceland. Article in Journal/Newspaper glacier Ice Sheet Iceland Wiley Online Library Hestvatn ENVELOPE(-20.705,-20.705,64.022,64.022) Journal of Quaternary Science |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Lake sediment records give valuable insight into the dynamic events that characterized the last deglaciation in Iceland. Here, we focus on the well‐dated sediment record from Hestvatn, a low‐elevation lake in south Iceland, that features six graded bedding events deposited by outburst floods from glacial lakes dammed by the decaying Iceland Ice Sheet (IIS) in the time period of the Vedde Ash and the G10ka Series tephra. Using climate proxies preserved in the sediment cores, in conjunction with regional glacial geomorphology, we reconstruct the retreat of the IIS in south Iceland, from a marine‐based glacier during the Younger Dryas to a land‐based glacier during the Preboreal. As the ice sheet margin withdrew to the central highlands, ice‐dammed lakes formed along glacier margins. The ice‐dams were occasionally breached, generating large‐scale jökulhlaups (catastrophic outburst floods) that deposited thick turbidite sequences preserved in the sediment record of Hestvatn. The high concentration of volcanic material incorporated within deglacial sediments indicates that along with IIS retreat, subglacial volcanic activity may have helped initiate some of the jökulhlaups. Onset of more stable Holocene conditions was reached after the final turbidite at ~10 ka bp , when the IIS had withdrawn from most of the highlands of Iceland. |
author2 |
National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Geirsdóttir, Áslaug Miller, Gifford H. Harning, David J. Hannesdóttir, Hrafnhildur Thordarson, Thor Jónsdóttir, Ingibjörg |
spellingShingle |
Geirsdóttir, Áslaug Miller, Gifford H. Harning, David J. Hannesdóttir, Hrafnhildur Thordarson, Thor Jónsdóttir, Ingibjörg Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record |
author_facet |
Geirsdóttir, Áslaug Miller, Gifford H. Harning, David J. Hannesdóttir, Hrafnhildur Thordarson, Thor Jónsdóttir, Ingibjörg |
author_sort |
Geirsdóttir, Áslaug |
title |
Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record |
title_short |
Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record |
title_full |
Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record |
title_fullStr |
Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record |
title_full_unstemmed |
Recurrent outburst floods and explosive volcanism during the Younger Dryas–Early Holocene deglaciation in south Iceland: evidence from a lacustrine record |
title_sort |
recurrent outburst floods and explosive volcanism during the younger dryas–early holocene deglaciation in south iceland: evidence from a lacustrine record |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/jqs.3344 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3344 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3344 https://onlinelibrary.wiley.com/doi/am-pdf/10.1002/jqs.3344 |
long_lat |
ENVELOPE(-20.705,-20.705,64.022,64.022) |
geographic |
Hestvatn |
geographic_facet |
Hestvatn |
genre |
glacier Ice Sheet Iceland |
genre_facet |
glacier Ice Sheet Iceland |
op_source |
Journal of Quaternary Science volume 37, issue 5, page 1006-1023 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#am http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3344 |
container_title |
Journal of Quaternary Science |
_version_ |
1800752079968403456 |