A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S)
Unanswered questions about the glacier and climate history preceding the global Last Glacial Maximum (LGM) in the southern temperate latitudes remain. The Marine Isotope Stage (MIS) 3 is normally understood as a global interstadial period; nonetheless its climate was punctuated by conspicuous variab...
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ftdoajarticles:oai:doaj.org/article:d086537292284c0891b71844a0635241 2023-05-15T16:40:43+02:00 A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) J.-L. García C. Lüthgens R. M. Vega Á. Rodés A. S. Hein S. A. Binnie 2021-05-01T00:00:00Z https://doi.org/10.5194/egqsj-70-105-2021 https://doaj.org/article/d086537292284c0891b71844a0635241 DE EN ger eng Copernicus Publications https://egqsj.copernicus.org/articles/70/105/2021/egqsj-70-105-2021.pdf https://doaj.org/toc/0424-7116 https://doaj.org/toc/2199-9090 doi:10.5194/egqsj-70-105-2021 0424-7116 2199-9090 https://doaj.org/article/d086537292284c0891b71844a0635241 Eiszeitalter und Gegenwart, Vol 70, Pp 105-128 (2021) Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/egqsj-70-105-2021 2022-12-31T05:46:24Z Unanswered questions about the glacier and climate history preceding the global Last Glacial Maximum (LGM) in the southern temperate latitudes remain. The Marine Isotope Stage (MIS) 3 is normally understood as a global interstadial period; nonetheless its climate was punctuated by conspicuous variability, and its signature has not been resolved beyond the polar realms. In this paper, we compile a 10 Be depth profile, single grain infrared (IR) stimulated luminescence dating and 14 C samples to derive a new glacier record for the principal outwash plain complex, deposited by the western Patagonian Ice Sheet (PIS) during the last glacial period (Llanquihue Glaciation) on the Isla de Chiloé, southern Chile (42 ∘ S). In this region, the Golfo de Corcovado Ice Lobe left a distinct geomorphic and stratigraphic imprint, suitable for reconstructing former ice dynamics and timing of past climate change. Our data indicate that maximum glaciation occurred by 57.8±4.7 ka without reaching the Pacific Ocean coast. Ice readavanced and buttressed against the eastern side of the Cordillera de la Costa again by 26.0±2.9 ka. Our data further support the notion of a large ice extent during parts of the MIS 3 in Patagonia and New Zealand but appear to contradict near contemporaneous interstadial evidence in the southern midlatitudes, including Chiloé. We propose that the PIS expanded to its full-glacial Llanquihue moraines, recording a rapid response of southern mountain glaciers to the millennial-scale climate stadials that punctuated the MIS 3 at the poles and elsewhere. Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Patagonia Pacific New Zealand De la Costa Chiloé ENVELOPE(-63.983,-63.983,-65.517,-65.517) New Glacier ENVELOPE(162.400,162.400,-77.033,-77.033) Llanquihue ENVELOPE(-65.083,-65.083,-65.550,-65.550) E&G Quaternary Science Journal 70 1 105 128 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
German English |
topic |
Geology QE1-996.5 |
spellingShingle |
Geology QE1-996.5 J.-L. García C. Lüthgens R. M. Vega Á. Rodés A. S. Hein S. A. Binnie A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) |
topic_facet |
Geology QE1-996.5 |
description |
Unanswered questions about the glacier and climate history preceding the global Last Glacial Maximum (LGM) in the southern temperate latitudes remain. The Marine Isotope Stage (MIS) 3 is normally understood as a global interstadial period; nonetheless its climate was punctuated by conspicuous variability, and its signature has not been resolved beyond the polar realms. In this paper, we compile a 10 Be depth profile, single grain infrared (IR) stimulated luminescence dating and 14 C samples to derive a new glacier record for the principal outwash plain complex, deposited by the western Patagonian Ice Sheet (PIS) during the last glacial period (Llanquihue Glaciation) on the Isla de Chiloé, southern Chile (42 ∘ S). In this region, the Golfo de Corcovado Ice Lobe left a distinct geomorphic and stratigraphic imprint, suitable for reconstructing former ice dynamics and timing of past climate change. Our data indicate that maximum glaciation occurred by 57.8±4.7 ka without reaching the Pacific Ocean coast. Ice readavanced and buttressed against the eastern side of the Cordillera de la Costa again by 26.0±2.9 ka. Our data further support the notion of a large ice extent during parts of the MIS 3 in Patagonia and New Zealand but appear to contradict near contemporaneous interstadial evidence in the southern midlatitudes, including Chiloé. We propose that the PIS expanded to its full-glacial Llanquihue moraines, recording a rapid response of southern mountain glaciers to the millennial-scale climate stadials that punctuated the MIS 3 at the poles and elsewhere. |
format |
Article in Journal/Newspaper |
author |
J.-L. García C. Lüthgens R. M. Vega Á. Rodés A. S. Hein S. A. Binnie |
author_facet |
J.-L. García C. Lüthgens R. M. Vega Á. Rodés A. S. Hein S. A. Binnie |
author_sort |
J.-L. García |
title |
A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) |
title_short |
A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) |
title_full |
A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) |
title_fullStr |
A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) |
title_full_unstemmed |
A composite 10 Be, IR-50 and 14 C chronology of the pre-Last Glacial Maximum (LGM) full ice extent of the western Patagonian Ice Sheet on the Isla de Chiloé, south Chile (42° S) |
title_sort |
composite 10 be, ir-50 and 14 c chronology of the pre-last glacial maximum (lgm) full ice extent of the western patagonian ice sheet on the isla de chiloé, south chile (42° s) |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/egqsj-70-105-2021 https://doaj.org/article/d086537292284c0891b71844a0635241 |
long_lat |
ENVELOPE(-63.983,-63.983,-65.517,-65.517) ENVELOPE(162.400,162.400,-77.033,-77.033) ENVELOPE(-65.083,-65.083,-65.550,-65.550) |
geographic |
Patagonia Pacific New Zealand De la Costa Chiloé New Glacier Llanquihue |
geographic_facet |
Patagonia Pacific New Zealand De la Costa Chiloé New Glacier Llanquihue |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Eiszeitalter und Gegenwart, Vol 70, Pp 105-128 (2021) |
op_relation |
https://egqsj.copernicus.org/articles/70/105/2021/egqsj-70-105-2021.pdf https://doaj.org/toc/0424-7116 https://doaj.org/toc/2199-9090 doi:10.5194/egqsj-70-105-2021 0424-7116 2199-9090 https://doaj.org/article/d086537292284c0891b71844a0635241 |
op_doi |
https://doi.org/10.5194/egqsj-70-105-2021 |
container_title |
E&G Quaternary Science Journal |
container_volume |
70 |
container_issue |
1 |
container_start_page |
105 |
op_container_end_page |
128 |
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1766031127604101120 |