Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile)
Holocene environmental changes in Patagonia were mostly shaped by unsteady ice-cover recession. Consequently, environmental reconstructions are largely based on discontinuous moraine chronologies from valley deposits. Here, we present a 3 m-long continuous sediment record recovered from Laguna Meset...
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2023
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00068986 2023-10-29T02:37:02+01:00 Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) Franco, Carolina Maldonado, Antonio Ohlendorf, Christian Gebhardt, A. Catalina de Porras, María Eugenia Nuevo-Delaunay, Amalia Méndez, César Zolitschka, Bernd 2023-09 electronic https://doi.org/10.5194/egusphere-2023-2156 https://noa.gwlb.de/receive/cop_mods_00068986 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067390/egusphere-2023-2156.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2156/egusphere-2023-2156.pdf eng eng Copernicus Publications https://doi.org/10.5194/egusphere-2023-2156 https://noa.gwlb.de/receive/cop_mods_00068986 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067390/egusphere-2023-2156.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2156/egusphere-2023-2156.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/egusphere-2023-2156 2023-10-01T23:21:41Z Holocene environmental changes in Patagonia were mostly shaped by unsteady ice-cover recession. Consequently, environmental reconstructions are largely based on discontinuous moraine chronologies from valley deposits. Here, we present a 3 m-long continuous sediment record recovered from Laguna Meseta (LME), a lake located on Meseta Chile Chico. Its altitude and location relative to the North Patagonian Icefield provide a unique opportunity to reconstruct the glacial history and the related environmental dynamics. Our radiocarbon chronology constrains sedimentation to the last ~10,000 years and provides a minimum age for postglacial ice-free lacustrine conditions due to a westward retreat of the ice cap. Lacustrine productivity reached its maximum at the start of sedimentation and decreased afterwards. Between 5,500 and 4,600 cal yr BP, a major shift towards allochthonous sediment accumulation occurred, caused by an abrupt increase in clastic deposition from basaltic lithologies of the Meseta Chile Chico. This episode correlates with the precipitation-driven mid-Holocene glacier advance of Patagonian glaciers and suggests that conditions were colder/wetter on the Meseta Chile Chico at that time. After 4,600 cal yr BP these conditions continued to supply LME with clastic sediments until a stepped decrease around 900 cal yr BP. Thereupon, lacustrine productivity distinctly increased and stabilized around 300 cal yr BP. Our findings indicate that environmental conditions on Meseta Chile Chico were mainly controlled by precipitation variability during regional oscillations of the Southern Hemisphere Westerly Winds over the last 10 ka. Article in Journal/Newspaper Ice cap Niedersächsisches Online-Archiv NOA |
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Niedersächsisches Online-Archiv NOA |
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language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Franco, Carolina Maldonado, Antonio Ohlendorf, Christian Gebhardt, A. Catalina de Porras, María Eugenia Nuevo-Delaunay, Amalia Méndez, César Zolitschka, Bernd Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) |
topic_facet |
article Verlagsveröffentlichung |
description |
Holocene environmental changes in Patagonia were mostly shaped by unsteady ice-cover recession. Consequently, environmental reconstructions are largely based on discontinuous moraine chronologies from valley deposits. Here, we present a 3 m-long continuous sediment record recovered from Laguna Meseta (LME), a lake located on Meseta Chile Chico. Its altitude and location relative to the North Patagonian Icefield provide a unique opportunity to reconstruct the glacial history and the related environmental dynamics. Our radiocarbon chronology constrains sedimentation to the last ~10,000 years and provides a minimum age for postglacial ice-free lacustrine conditions due to a westward retreat of the ice cap. Lacustrine productivity reached its maximum at the start of sedimentation and decreased afterwards. Between 5,500 and 4,600 cal yr BP, a major shift towards allochthonous sediment accumulation occurred, caused by an abrupt increase in clastic deposition from basaltic lithologies of the Meseta Chile Chico. This episode correlates with the precipitation-driven mid-Holocene glacier advance of Patagonian glaciers and suggests that conditions were colder/wetter on the Meseta Chile Chico at that time. After 4,600 cal yr BP these conditions continued to supply LME with clastic sediments until a stepped decrease around 900 cal yr BP. Thereupon, lacustrine productivity distinctly increased and stabilized around 300 cal yr BP. Our findings indicate that environmental conditions on Meseta Chile Chico were mainly controlled by precipitation variability during regional oscillations of the Southern Hemisphere Westerly Winds over the last 10 ka. |
format |
Article in Journal/Newspaper |
author |
Franco, Carolina Maldonado, Antonio Ohlendorf, Christian Gebhardt, A. Catalina de Porras, María Eugenia Nuevo-Delaunay, Amalia Méndez, César Zolitschka, Bernd |
author_facet |
Franco, Carolina Maldonado, Antonio Ohlendorf, Christian Gebhardt, A. Catalina de Porras, María Eugenia Nuevo-Delaunay, Amalia Méndez, César Zolitschka, Bernd |
author_sort |
Franco, Carolina |
title |
Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) |
title_short |
Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) |
title_full |
Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) |
title_fullStr |
Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) |
title_full_unstemmed |
Holocene environmental and climate evolution of Central West Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5º S, Chile) |
title_sort |
holocene environmental and climate evolution of central west patagonia as reconstructed from lacustrine sediments of meseta chile chico (46.5º s, chile) |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2023-2156 https://noa.gwlb.de/receive/cop_mods_00068986 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067390/egusphere-2023-2156.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2156/egusphere-2023-2156.pdf |
genre |
Ice cap |
genre_facet |
Ice cap |
op_relation |
https://doi.org/10.5194/egusphere-2023-2156 https://noa.gwlb.de/receive/cop_mods_00068986 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00067390/egusphere-2023-2156.pdf https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2156/egusphere-2023-2156.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-2023-2156 |
_version_ |
1781061345478705152 |