Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region
Abstract Core 95‐HV was obtained from Lake Hestvatn, southern Iceland, after a seismic survey had identified a sediment sequence over 45 m thick in the lake. The core penetrated ca. 25 m into the sediment correlating with seismostratigraphic unit 2 of alternating seismic facies, with semi‐parallel r...
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crwiley:10.1002/jqs.569 2024-06-02T08:07:05+00:00 Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region Hardardóttir, Jórunn Geirsdóttir, Áslaug Sveinbjörnsdóttir, Árny E. Icelandic Research Council National Science Foundation 2001 http://dx.doi.org/10.1002/jqs.569 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.569 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.569 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 16, issue 2, page 167-179 ISSN 0267-8179 1099-1417 journal-article 2001 crwiley https://doi.org/10.1002/jqs.569 2024-05-03T10:59:11Z Abstract Core 95‐HV was obtained from Lake Hestvatn, southern Iceland, after a seismic survey had identified a sediment sequence over 45 m thick in the lake. The core penetrated ca. 25 m into the sediment correlating with seismostratigraphic unit 2 of alternating seismic facies, with semi‐parallel reflectors of high amplitude and chaotic reflectors. Detailed sedimentological, chemical, magnetic and chronostratigraphical analyses on core 95‐HV, combined with interpretation of the seismic survey, show considerable changes in the sedimentary environment between ca. 10300 and 9000 14 C yr BP (reservoir corrected). The lowermost ca. 12 m of the core was deposited in a marine environment during energy shifts from a very rapid accumulation of sandy turbidite units to slower deposition of suspended fine‐grained sediments. The turbidite units, thought to have originated from catastrophic outburst floods (jökulhlaup), contributed greatly to the high sediment accumulation rate at the Younger Dryas–Preboreal transition. Further change in the sedimentary environments is evidenced by the deposition of organic‐rich lake sediment with abundant tephra layers, starting at ca. 9000 yr BP (seismostratigraphic unit 3). The study shows that the inland glacier did not override the site of Hestvatn during the time of sediment deposition in the lake basin. Copyright © 2001 John Wiley & Sons, Ltd. Article in Journal/Newspaper glacier Iceland Wiley Online Library Hestvatn ENVELOPE(-20.705,-20.705,64.022,64.022) Journal of Quaternary Science 16 2 167 179 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Core 95‐HV was obtained from Lake Hestvatn, southern Iceland, after a seismic survey had identified a sediment sequence over 45 m thick in the lake. The core penetrated ca. 25 m into the sediment correlating with seismostratigraphic unit 2 of alternating seismic facies, with semi‐parallel reflectors of high amplitude and chaotic reflectors. Detailed sedimentological, chemical, magnetic and chronostratigraphical analyses on core 95‐HV, combined with interpretation of the seismic survey, show considerable changes in the sedimentary environment between ca. 10300 and 9000 14 C yr BP (reservoir corrected). The lowermost ca. 12 m of the core was deposited in a marine environment during energy shifts from a very rapid accumulation of sandy turbidite units to slower deposition of suspended fine‐grained sediments. The turbidite units, thought to have originated from catastrophic outburst floods (jökulhlaup), contributed greatly to the high sediment accumulation rate at the Younger Dryas–Preboreal transition. Further change in the sedimentary environments is evidenced by the deposition of organic‐rich lake sediment with abundant tephra layers, starting at ca. 9000 yr BP (seismostratigraphic unit 3). The study shows that the inland glacier did not override the site of Hestvatn during the time of sediment deposition in the lake basin. Copyright © 2001 John Wiley & Sons, Ltd. |
author2 |
Icelandic Research Council National Science Foundation |
format |
Article in Journal/Newspaper |
author |
Hardardóttir, Jórunn Geirsdóttir, Áslaug Sveinbjörnsdóttir, Árny E. |
spellingShingle |
Hardardóttir, Jórunn Geirsdóttir, Áslaug Sveinbjörnsdóttir, Árny E. Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region |
author_facet |
Hardardóttir, Jórunn Geirsdóttir, Áslaug Sveinbjörnsdóttir, Árny E. |
author_sort |
Hardardóttir, Jórunn |
title |
Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region |
title_short |
Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region |
title_full |
Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region |
title_fullStr |
Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region |
title_full_unstemmed |
Seismostratigraphy and sediment studies of Lake Hestvatn, southern Iceland: implications for the deglacial history of the region |
title_sort |
seismostratigraphy and sediment studies of lake hestvatn, southern iceland: implications for the deglacial history of the region |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1002/jqs.569 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.569 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.569 |
long_lat |
ENVELOPE(-20.705,-20.705,64.022,64.022) |
geographic |
Hestvatn |
geographic_facet |
Hestvatn |
genre |
glacier Iceland |
genre_facet |
glacier Iceland |
op_source |
Journal of Quaternary Science volume 16, issue 2, page 167-179 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.569 |
container_title |
Journal of Quaternary Science |
container_volume |
16 |
container_issue |
2 |
container_start_page |
167 |
op_container_end_page |
179 |
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1800752094373740544 |