Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile)
Holocene environmental changes in Patagonia were mostly shaped by fluctuating 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 Me...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00072743 2024-05-12T08:05:08+00:00 Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile) Franco, Carolina Maldonado, Antonio Ohlendorf, Christian Gebhardt, A. Catalina de Porras, María Eugenia Nuevo-Delaunay, Amalia Méndez, César Zolitschka, Bernd 2024-04 electronic https://doi.org/10.5194/cp-20-817-2024 https://noa.gwlb.de/receive/cop_mods_00072743 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070939/cp-20-817-2024.pdf https://cp.copernicus.org/articles/20/817/2024/cp-20-817-2024.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-20-817-2024 https://noa.gwlb.de/receive/cop_mods_00072743 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070939/cp-20-817-2024.pdf https://cp.copernicus.org/articles/20/817/2024/cp-20-817-2024.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2024 ftnonlinearchiv https://doi.org/10.5194/cp-20-817-2024 2024-04-15T23:39:04Z Holocene environmental changes in Patagonia were mostly shaped by fluctuating 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 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 the lake phase and decreased afterwards. Between 5500 and 4600 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 and/or wetter on Meseta Chile Chico at that time. After 4600 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 changes in sedimentation on Meseta Chile Chico were mainly controlled by regional variability in the precipitation. Furthermore, strong correlation between our records and available proxies for oscillations of the Southern Hemisphere Westerly Winds suggest a pronounced climatic control by this prominent wind system for central west Patagonia during the last 10 000 years. Article in Journal/Newspaper Ice cap Niedersächsisches Online-Archiv NOA Patagonia Climate of the Past 20 4 817 839 |
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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 (46.5° S, Chile) |
topic_facet |
article Verlagsveröffentlichung |
description |
Holocene environmental changes in Patagonia were mostly shaped by fluctuating 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 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 the lake phase and decreased afterwards. Between 5500 and 4600 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 and/or wetter on Meseta Chile Chico at that time. After 4600 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 changes in sedimentation on Meseta Chile Chico were mainly controlled by regional variability in the precipitation. Furthermore, strong correlation between our records and available proxies for oscillations of the Southern Hemisphere Westerly Winds suggest a pronounced climatic control by this prominent wind system for central west Patagonia during the last 10 000 years. |
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 (46.5° S, Chile) |
title_short |
Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile) |
title_full |
Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile) |
title_fullStr |
Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile) |
title_full_unstemmed |
Holocene environmental and climate evolution of central west Patagonia as reconstructed from lacustrine sediments of Meseta Chile Chico (46.5° S, Chile) |
title_sort |
holocene environmental and climate evolution of central west patagonia as reconstructed from lacustrine sediments of meseta chile chico (46.5° s, chile) |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-817-2024 https://noa.gwlb.de/receive/cop_mods_00072743 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070939/cp-20-817-2024.pdf https://cp.copernicus.org/articles/20/817/2024/cp-20-817-2024.pdf |
geographic |
Patagonia |
geographic_facet |
Patagonia |
genre |
Ice cap |
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Ice cap |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-20-817-2024 https://noa.gwlb.de/receive/cop_mods_00072743 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00070939/cp-20-817-2024.pdf https://cp.copernicus.org/articles/20/817/2024/cp-20-817-2024.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-20-817-2024 |
container_title |
Climate of the Past |
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20 |
container_issue |
4 |
container_start_page |
817 |
op_container_end_page |
839 |
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1798847402349690880 |