The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia
<jats:p>There are still many uncertainties about the climatic forcing that drove the glacier fluctuations of the Patagonian Ice Sheet (PIS, 38–55°S) during the last glacial period. A key source of uncertainty is the asynchrony of ice lobe fluctuations between the northern, central, and souther...
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Online Access: | http://livrepository.liverpool.ac.uk/3158930/ https://doi.org/10.3389/feart.2022.892316 |
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:3158930 2023-05-15T16:41:29+02:00 The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia Lira, María-Paz García, Juan-Luis Bentley, Michael J Jamieson, Stewart SR Darvill, Christopher M Hein, Andrew S Fernández, Hans Rodés, Ángel Fabel, Derek Smedley, Rachel K Binnie, Steven A 2022 http://livrepository.liverpool.ac.uk/3158930/ https://doi.org/10.3389/feart.2022.892316 unknown Frontiers Media SA Collapse authors list. Lira, María-Paz, García, Juan-Luis, Bentley, Michael J, Jamieson, Stewart SR, Darvill, Christopher M, Hein, Andrew S, Fernández, Hans, Rodés, Ángel, Fabel, Derek, Smedley, Rachel K orcid:0000-0001-7773-5193 et al (show 1 more authors) and Binnie, Steven A (2022) The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia. Frontiers in Earth Science, 10. Article NonPeerReviewed 2022 ftunivliverpool https://doi.org/10.3389/feart.2022.892316 2023-01-20T00:17:05Z <jats:p>There are still many uncertainties about the climatic forcing that drove the glacier fluctuations of the Patagonian Ice Sheet (PIS, 38–55°S) during the last glacial period. A key source of uncertainty is the asynchrony of ice lobe fluctuations between the northern, central, and southern PIS. To fully understand the regional trends requires careful mapping and extensive geochronological studies. This paper presents geomorphological and geochronological reconstructions of the glacial and deglacial landforms formed during the last glacial period at the Seno Skyring lobe, southernmost Patagonia (52°S, 71°W). We present a detailed geomorphological map, where we identify two moraine systems. The outer and older is named Laguna Blanca (LB) and the inner Río Verde (RV). The LB moraines were built subaerially, whereas parts of the RV were deposited subaqueously under the palaeo lake Laguna Blanca, which developed during deglaciation. We conducted surface exposure <jats:sup>10</jats:sup>Be dating methods on boulder samples collected from LB and RV glacial margins. The moraine LB III and LB IV formed at 26.3 ± 2.3 ka (n = 5) and 24.3 ± 0.9 ka (n = 3), respectively. For the inner RV moraine, we obtained an age of 18.7 ± 1.5 ka (n = 6). For the palaeo Laguna Blanca evolution, we performed <jats:sup>10</jats:sup>Be exposure ages on shoreline berms and optically stimulated luminesce dating to constrain the lake levels, and <jats:sup>10</jats:sup>Be depth profile dating on an outwash deposit formed by a partial lake drainage event, which occurred at 22 ± 3 ka. For the RV moraine deglaciation, we performed radiocarbon dating of basal sediments in a peat bog, which indicates that the glacier retreated from the terminal RV moraine by at least c. 16.4 cal kyr BP. Our moraine geochronology shows an asynchrony in the maximum extents and a different pattern of ice advances between neighbouring lobes in southern Patagonia. We speculate that this may be due, at least in part, to the ... Article in Journal/Newspaper Ice Sheet The University of Liverpool Repository Patagonia Frontiers in Earth Science 10 |
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The University of Liverpool Repository |
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<jats:p>There are still many uncertainties about the climatic forcing that drove the glacier fluctuations of the Patagonian Ice Sheet (PIS, 38–55°S) during the last glacial period. A key source of uncertainty is the asynchrony of ice lobe fluctuations between the northern, central, and southern PIS. To fully understand the regional trends requires careful mapping and extensive geochronological studies. This paper presents geomorphological and geochronological reconstructions of the glacial and deglacial landforms formed during the last glacial period at the Seno Skyring lobe, southernmost Patagonia (52°S, 71°W). We present a detailed geomorphological map, where we identify two moraine systems. The outer and older is named Laguna Blanca (LB) and the inner Río Verde (RV). The LB moraines were built subaerially, whereas parts of the RV were deposited subaqueously under the palaeo lake Laguna Blanca, which developed during deglaciation. We conducted surface exposure <jats:sup>10</jats:sup>Be dating methods on boulder samples collected from LB and RV glacial margins. The moraine LB III and LB IV formed at 26.3 ± 2.3 ka (n = 5) and 24.3 ± 0.9 ka (n = 3), respectively. For the inner RV moraine, we obtained an age of 18.7 ± 1.5 ka (n = 6). For the palaeo Laguna Blanca evolution, we performed <jats:sup>10</jats:sup>Be exposure ages on shoreline berms and optically stimulated luminesce dating to constrain the lake levels, and <jats:sup>10</jats:sup>Be depth profile dating on an outwash deposit formed by a partial lake drainage event, which occurred at 22 ± 3 ka. For the RV moraine deglaciation, we performed radiocarbon dating of basal sediments in a peat bog, which indicates that the glacier retreated from the terminal RV moraine by at least c. 16.4 cal kyr BP. Our moraine geochronology shows an asynchrony in the maximum extents and a different pattern of ice advances between neighbouring lobes in southern Patagonia. We speculate that this may be due, at least in part, to the ... |
format |
Article in Journal/Newspaper |
author |
Lira, María-Paz García, Juan-Luis Bentley, Michael J Jamieson, Stewart SR Darvill, Christopher M Hein, Andrew S Fernández, Hans Rodés, Ángel Fabel, Derek Smedley, Rachel K Binnie, Steven A |
spellingShingle |
Lira, María-Paz García, Juan-Luis Bentley, Michael J Jamieson, Stewart SR Darvill, Christopher M Hein, Andrew S Fernández, Hans Rodés, Ángel Fabel, Derek Smedley, Rachel K Binnie, Steven A The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia |
author_facet |
Lira, María-Paz García, Juan-Luis Bentley, Michael J Jamieson, Stewart SR Darvill, Christopher M Hein, Andrew S Fernández, Hans Rodés, Ángel Fabel, Derek Smedley, Rachel K Binnie, Steven A |
author_sort |
Lira, María-Paz |
title |
The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia |
title_short |
The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia |
title_full |
The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia |
title_fullStr |
The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia |
title_full_unstemmed |
The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia |
title_sort |
last glacial maximum and deglacial history of the seno skyring ice lobe (52°s), southern patagonia |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://livrepository.liverpool.ac.uk/3158930/ https://doi.org/10.3389/feart.2022.892316 |
geographic |
Patagonia |
geographic_facet |
Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Collapse authors list. Lira, María-Paz, García, Juan-Luis, Bentley, Michael J, Jamieson, Stewart SR, Darvill, Christopher M, Hein, Andrew S, Fernández, Hans, Rodés, Ángel, Fabel, Derek, Smedley, Rachel K orcid:0000-0001-7773-5193 et al (show 1 more authors) and Binnie, Steven A (2022) The Last Glacial Maximum and Deglacial History of the Seno Skyring Ice Lobe (52°S), Southern Patagonia. Frontiers in Earth Science, 10. |
op_doi |
https://doi.org/10.3389/feart.2022.892316 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
_version_ |
1766031916615598080 |