Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia
We undertook multi-proxy analyses on two sediment cores from Lago Pato, a small lake basin at 51°S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake-level change in the TdP and Última Esperanza region over the last ∼30,000 cal...
Published in: | Frontiers in Earth Science |
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Online Access: | http://dx.doi.org/10.3389/feart.2022.813396 https://www.frontiersin.org/articles/10.3389/feart.2022.813396/full |
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crfrontiers:10.3389/feart.2022.813396 2024-05-19T07:31:53+00:00 Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia Roberts, Stephen J. McCulloch, Robert D. Emmings, Joseph F. Davies, Sarah J. Van Nieuwenhuyze, Wim Sterken, Mieke Heirman, Katrien Van Wichelen, Jeroen Diaz, Carolina Van de Vyver, Evelien Whittle, Alex Vyverman, Wim Hodgson, Dominic A. Verleyen, Elie UK Research and Innovation Natural Environment Research Council 2022 http://dx.doi.org/10.3389/feart.2022.813396 https://www.frontiersin.org/articles/10.3389/feart.2022.813396/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 10 ISSN 2296-6463 journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2022.813396 2024-04-24T07:13:05Z We undertook multi-proxy analyses on two sediment cores from Lago Pato, a small lake basin at 51°S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake-level change in the TdP and Última Esperanza region over the last ∼30,000 cal a BP (30 ka). Lago Pato is situated in a region overridden by the Southern Patagonian Ice Field during the Last Glacial and in a transitional climatic zone of Southern Patagonia sensitive to seasonal- to millennial-scale changes in the Southern Hemisphere Westerly Winds (SWW). Results show that a deep ice-dammed and enlarged palaeolake encompassed Lago del Toro and Lago Pato c. 30–20 ka after the ice had retreated from local-Last Glacial Maximum (l-LGM) limits at c. 48–34 ka and during the build-up to the global-Last Glacial Maximum (g-LGM), c. 26–19 ka. Gaps in both sediment records between c. 20–13.4 ka and c. 20–10 ka suggest hiatuses in sediment accumulation during the g-LGM and Antarctic Cold Reversal (ACR) readvances and/or removal by lake lowering or flushing during the Late Glacial–early Holocene. The palaeolake level dropped from >100 m a.s.l. to ∼40–50 m a.s.l. towards the end of the ACR c. 13.4–13.0 ka, creating a shallower glaciolacustrine environment dammed by an ice tongue in the Estancia Puerto Consuelo–Última Esperanza fjord. Further lowering of the enlarged palaeolake level occurred when the ice thinned to <40 m a.s.l., eventually isolating Lago Pato from Lago del Toro and glaciogenic sediment input at c. 11.7 ka. After isolation, the ecology and water levels in Lago Pato became sensitive to regional climate shifts. The shallow, stable, and highly anoxic environment that developed after c. 11.7 ka is associated with weaker (or poleward shifted) SWW at 51°S and was replaced at c. 10 ka by an increasingly productive shallow-littoral lake with a variable lake-level and periodic shifts in anoxic-oxic bottom water conditions and ratios of benthic-planktonic diatoms. A more open Nothofagus ... Article in Journal/Newspaper Antarc* Antarctic Frontiers (Publisher) Frontiers in Earth Science 10 |
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Open Polar |
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Frontiers (Publisher) |
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crfrontiers |
language |
unknown |
description |
We undertook multi-proxy analyses on two sediment cores from Lago Pato, a small lake basin at 51°S topographically separated from Lago del Toro in Torres del Paine (TdP), to provide insights into glacier dynamics and lake-level change in the TdP and Última Esperanza region over the last ∼30,000 cal a BP (30 ka). Lago Pato is situated in a region overridden by the Southern Patagonian Ice Field during the Last Glacial and in a transitional climatic zone of Southern Patagonia sensitive to seasonal- to millennial-scale changes in the Southern Hemisphere Westerly Winds (SWW). Results show that a deep ice-dammed and enlarged palaeolake encompassed Lago del Toro and Lago Pato c. 30–20 ka after the ice had retreated from local-Last Glacial Maximum (l-LGM) limits at c. 48–34 ka and during the build-up to the global-Last Glacial Maximum (g-LGM), c. 26–19 ka. Gaps in both sediment records between c. 20–13.4 ka and c. 20–10 ka suggest hiatuses in sediment accumulation during the g-LGM and Antarctic Cold Reversal (ACR) readvances and/or removal by lake lowering or flushing during the Late Glacial–early Holocene. The palaeolake level dropped from >100 m a.s.l. to ∼40–50 m a.s.l. towards the end of the ACR c. 13.4–13.0 ka, creating a shallower glaciolacustrine environment dammed by an ice tongue in the Estancia Puerto Consuelo–Última Esperanza fjord. Further lowering of the enlarged palaeolake level occurred when the ice thinned to <40 m a.s.l., eventually isolating Lago Pato from Lago del Toro and glaciogenic sediment input at c. 11.7 ka. After isolation, the ecology and water levels in Lago Pato became sensitive to regional climate shifts. The shallow, stable, and highly anoxic environment that developed after c. 11.7 ka is associated with weaker (or poleward shifted) SWW at 51°S and was replaced at c. 10 ka by an increasingly productive shallow-littoral lake with a variable lake-level and periodic shifts in anoxic-oxic bottom water conditions and ratios of benthic-planktonic diatoms. A more open Nothofagus ... |
author2 |
UK Research and Innovation Natural Environment Research Council |
format |
Article in Journal/Newspaper |
author |
Roberts, Stephen J. McCulloch, Robert D. Emmings, Joseph F. Davies, Sarah J. Van Nieuwenhuyze, Wim Sterken, Mieke Heirman, Katrien Van Wichelen, Jeroen Diaz, Carolina Van de Vyver, Evelien Whittle, Alex Vyverman, Wim Hodgson, Dominic A. Verleyen, Elie |
spellingShingle |
Roberts, Stephen J. McCulloch, Robert D. Emmings, Joseph F. Davies, Sarah J. Van Nieuwenhuyze, Wim Sterken, Mieke Heirman, Katrien Van Wichelen, Jeroen Diaz, Carolina Van de Vyver, Evelien Whittle, Alex Vyverman, Wim Hodgson, Dominic A. Verleyen, Elie Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia |
author_facet |
Roberts, Stephen J. McCulloch, Robert D. Emmings, Joseph F. Davies, Sarah J. Van Nieuwenhuyze, Wim Sterken, Mieke Heirman, Katrien Van Wichelen, Jeroen Diaz, Carolina Van de Vyver, Evelien Whittle, Alex Vyverman, Wim Hodgson, Dominic A. Verleyen, Elie |
author_sort |
Roberts, Stephen J. |
title |
Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia |
title_short |
Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia |
title_full |
Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia |
title_fullStr |
Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia |
title_full_unstemmed |
Late Glacial and Holocene Palaeolake History of the Última Esperanza Region of Southern Patagonia |
title_sort |
late glacial and holocene palaeolake history of the última esperanza region of southern patagonia |
publisher |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/feart.2022.813396 https://www.frontiersin.org/articles/10.3389/feart.2022.813396/full |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Frontiers in Earth Science volume 10 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2022.813396 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
_version_ |
1799469764881416192 |