The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores
Abstract Up to 2.3 m long sediment sequences were recovered from the deepest part of Lake Hoare in Taylor Valley, southern Victoria Land, Antarctica. Sedimentological, biogeochemical, and mineralogical analyses revealed a high spatial variability of these parameters in Lake Hoare. Five distinct lith...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1626 2023-06-11T04:06:07+02:00 The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores Wagner, Bernd Ortlepp, Sabrina Doran, Peter T. Kenig, Fabien Melles, Martin Burkemper, Andy 2011-06-01T07:00:00Z https://digitalcommons.lsu.edu/geo_pubs/627 https://doi.org/10.1017/S0954102011000125 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/627 doi:10.1017/S0954102011000125 Faculty Publications lake level fluctuations late Quaternary McMurdo Dry Valleys palaeolimnology text 2011 ftlouisianastuir https://doi.org/10.1017/S0954102011000125 2023-05-28T18:16:59Z Abstract Up to 2.3 m long sediment sequences were recovered from the deepest part of Lake Hoare in Taylor Valley, southern Victoria Land, Antarctica. Sedimentological, biogeochemical, and mineralogical analyses revealed a high spatial variability of these parameters in Lake Hoare. Five distinct lithological units were recognized. Radiocarbon dating of bulk organic carbon samples from the sediment sequences yielded apparently too old ages and significant age reversals, which prevented the establishment of reliable age-depth models. However, cross correlation of the sedimentary characteristics with those of sediment records from neighbouring Lake Fryxell indicates that the lowermost two units of the Lake Hoare sediment sequences were probably deposited during the final phase of proglacial Lake Washburn, which occupied Taylor Valley during the late Pleistocene and early Holocene. High amounts of angular gravel and the absence of fine-grained material imply a complete desiccation with subaerial conditions in the Lake Hoare basin in the middle of the Holocene. The late Holocene (< c. 3300 calendar yr bp) is characterized by the establishment of environmental conditions similar to those existing today. A late Holocene desiccation event, such as proposed in former studies, is not indicated in the sediment sequences recovered. © Antarctic Science Ltd 2011. Text Antarc* Antarctic Antarctica McMurdo Dry Valleys Victoria Land LSU Digital Commons (Louisiana State University) Antarctic Victoria Land McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Lake Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Washburn ENVELOPE(-86.133,-86.133,-77.617,-77.617) Lake Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Antarctic Science 23 3 307 319 |
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Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
lake level fluctuations late Quaternary McMurdo Dry Valleys palaeolimnology |
spellingShingle |
lake level fluctuations late Quaternary McMurdo Dry Valleys palaeolimnology Wagner, Bernd Ortlepp, Sabrina Doran, Peter T. Kenig, Fabien Melles, Martin Burkemper, Andy The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores |
topic_facet |
lake level fluctuations late Quaternary McMurdo Dry Valleys palaeolimnology |
description |
Abstract Up to 2.3 m long sediment sequences were recovered from the deepest part of Lake Hoare in Taylor Valley, southern Victoria Land, Antarctica. Sedimentological, biogeochemical, and mineralogical analyses revealed a high spatial variability of these parameters in Lake Hoare. Five distinct lithological units were recognized. Radiocarbon dating of bulk organic carbon samples from the sediment sequences yielded apparently too old ages and significant age reversals, which prevented the establishment of reliable age-depth models. However, cross correlation of the sedimentary characteristics with those of sediment records from neighbouring Lake Fryxell indicates that the lowermost two units of the Lake Hoare sediment sequences were probably deposited during the final phase of proglacial Lake Washburn, which occupied Taylor Valley during the late Pleistocene and early Holocene. High amounts of angular gravel and the absence of fine-grained material imply a complete desiccation with subaerial conditions in the Lake Hoare basin in the middle of the Holocene. The late Holocene (< c. 3300 calendar yr bp) is characterized by the establishment of environmental conditions similar to those existing today. A late Holocene desiccation event, such as proposed in former studies, is not indicated in the sediment sequences recovered. © Antarctic Science Ltd 2011. |
format |
Text |
author |
Wagner, Bernd Ortlepp, Sabrina Doran, Peter T. Kenig, Fabien Melles, Martin Burkemper, Andy |
author_facet |
Wagner, Bernd Ortlepp, Sabrina Doran, Peter T. Kenig, Fabien Melles, Martin Burkemper, Andy |
author_sort |
Wagner, Bernd |
title |
The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores |
title_short |
The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores |
title_full |
The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores |
title_fullStr |
The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores |
title_full_unstemmed |
The Holocene environmental history of Lake Hoare, Taylor Valley, Antarctica, reconstructed from sediment cores |
title_sort |
holocene environmental history of lake hoare, taylor valley, antarctica, reconstructed from sediment cores |
publisher |
LSU Digital Commons |
publishDate |
2011 |
url |
https://digitalcommons.lsu.edu/geo_pubs/627 https://doi.org/10.1017/S0954102011000125 |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(-86.133,-86.133,-77.617,-77.617) ENVELOPE(162.850,162.850,-77.633,-77.633) |
geographic |
Antarctic Victoria Land McMurdo Dry Valleys Taylor Valley Fryxell Hoare Lake Fryxell Washburn Lake Hoare |
geographic_facet |
Antarctic Victoria Land McMurdo Dry Valleys Taylor Valley Fryxell Hoare Lake Fryxell Washburn Lake Hoare |
genre |
Antarc* Antarctic Antarctica McMurdo Dry Valleys Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Dry Valleys Victoria Land |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/627 doi:10.1017/S0954102011000125 |
op_doi |
https://doi.org/10.1017/S0954102011000125 |
container_title |
Antarctic Science |
container_volume |
23 |
container_issue |
3 |
container_start_page |
307 |
op_container_end_page |
319 |
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1768377889943715840 |