Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM
International audience Whether glaciers in the southern hemisphere were asynchronous to those in the north during the global Last Glacial Maximum (gLGM; 26.5–19 ka) is still debated. In Patagonia (South America), numerous ice lobes attained their maximum extents during diverse episodes of the last g...
Main Authors: | , , , , , , , |
---|---|
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2022
|
Subjects: | |
Online Access: | https://hal.science/hal-04492946 |
id |
ftnormandieuniv:oai:HAL:hal-04492946v1 |
---|---|
record_format |
openpolar |
spelling |
ftnormandieuniv:oai:HAL:hal-04492946v1 2024-04-14T08:13:19+00:00 Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM Çiner, Attila Sarıkaya, Mehmet, Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek Avrasya Yer Bilimleri Enstitüsü = Eurasia Institute of Earth Sciences Istanbul (AYBE) Istanbul Technical University (ITÜ) Identité et Différenciation de l’Espace, de l’Environnement et des Sociétés (IDEES) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université Le Havre Normandie (ULH) Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire Homme et Société (IRIHS) Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU) Universidad de Magallanes (UMAG) Universidad de Buenos Aires Buenos Aires (UBA) Scottish Universities Environmental Research Centre (SUERC) University of Glasgow-University of Edinburgh (Edin.) 2022-10-01 https://hal.science/hal-04492946 en eng HAL CCSD Elsevier hal-04492946 https://hal.science/hal-04492946 http://creativecommons.org/licenses/by-nc/ ISSN: 0169-555X Geomorphology https://hal.science/hal-04492946 Geomorphology, 2022, 414, pp.108381 https://www.sciencedirect.com/science/article/pii/S0169555X22002744?via%3Dihub Aníbal Pinto moraine Última Esperanza ice lobe Patagonia Cosmogenic surface exposure dating Glacial asynchronicity [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2022 ftnormandieuniv 2024-03-21T16:22:58Z International audience Whether glaciers in the southern hemisphere were asynchronous to those in the north during the global Last Glacial Maximum (gLGM; 26.5–19 ka) is still debated. In Patagonia (South America), numerous ice lobes attained their maximum extents during diverse episodes of the last glacial cycle. To understand the variations in the gLGM vs local LGM record, we studied the Lago Aníbal Pinto area (52°00′ S, 72°40′ E; Chile), where several moraine belts were deposited by one of the eastward-flowing southern Patagonian Ice Sheet (PIS) outlet ice lobes; the Última Esperanza. We report eight 10Be terrestrial cosmogenic nuclides (TCN) surface ages from granitic moraine boulders. Our weighted average age obtained from the southern part of the Río Turbio moraine belt yields 50.7 ± 2.4 ka (oldest boulder age; 53.8 ± 5.3 ka) and confirms the greatest extent of the local Last Glacial Maximum (lLGM) during Marine Isotope Stage 3 (MIS 3) in the previously dated northern moraines from the same belt. Our 10Be TCN age (32.6 ± 2.2 ka) derived from the Dos Lagunas moraine, which makes up the northernmost margin of the Última Esperanza ice lobe's Arauco advance, also validates the MIS 3 timing. Following the formation of Arauco moraines, the Última Esperanza ice lobe was split into three main tributaries in the south, which formed three restricted and previously undated moraine complexes. We dated one of them, the Aníbal Pinto moraine complex. Whereas the highest moraine yielded the oldest age (28.3 ± 2.2 ka), lower moraine's surface that was later truncated as a lacustrine erosional platform, yielded younger boulder ages (weighted average age = 18.9 ± 1.0 ka; oldest boulder age = 19.0 ± 1.5 ka), indicating they were deposited under the Pinto Lake level. Our new age data allow us to propose a new chronology for the Aníbal Pinto moraine complex and consolidate previously published ages from other moraine belts. We attribute the Aníbal Pinto moraine complex to early gLGM (MIS 2), emphasising that the gLGM was half ... Article in Journal/Newspaper Ice Sheet Normandie Université: HAL Arauco ENVELOPE(-70.533,-70.533,-68.767,-68.767) Esperanza ENVELOPE(-56.983,-56.983,-63.400,-63.400) Patagonia |
institution |
Open Polar |
collection |
Normandie Université: HAL |
op_collection_id |
ftnormandieuniv |
language |
English |
topic |
Aníbal Pinto moraine Última Esperanza ice lobe Patagonia Cosmogenic surface exposure dating Glacial asynchronicity [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Aníbal Pinto moraine Última Esperanza ice lobe Patagonia Cosmogenic surface exposure dating Glacial asynchronicity [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Çiner, Attila Sarıkaya, Mehmet, Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
topic_facet |
Aníbal Pinto moraine Última Esperanza ice lobe Patagonia Cosmogenic surface exposure dating Glacial asynchronicity [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Whether glaciers in the southern hemisphere were asynchronous to those in the north during the global Last Glacial Maximum (gLGM; 26.5–19 ka) is still debated. In Patagonia (South America), numerous ice lobes attained their maximum extents during diverse episodes of the last glacial cycle. To understand the variations in the gLGM vs local LGM record, we studied the Lago Aníbal Pinto area (52°00′ S, 72°40′ E; Chile), where several moraine belts were deposited by one of the eastward-flowing southern Patagonian Ice Sheet (PIS) outlet ice lobes; the Última Esperanza. We report eight 10Be terrestrial cosmogenic nuclides (TCN) surface ages from granitic moraine boulders. Our weighted average age obtained from the southern part of the Río Turbio moraine belt yields 50.7 ± 2.4 ka (oldest boulder age; 53.8 ± 5.3 ka) and confirms the greatest extent of the local Last Glacial Maximum (lLGM) during Marine Isotope Stage 3 (MIS 3) in the previously dated northern moraines from the same belt. Our 10Be TCN age (32.6 ± 2.2 ka) derived from the Dos Lagunas moraine, which makes up the northernmost margin of the Última Esperanza ice lobe's Arauco advance, also validates the MIS 3 timing. Following the formation of Arauco moraines, the Última Esperanza ice lobe was split into three main tributaries in the south, which formed three restricted and previously undated moraine complexes. We dated one of them, the Aníbal Pinto moraine complex. Whereas the highest moraine yielded the oldest age (28.3 ± 2.2 ka), lower moraine's surface that was later truncated as a lacustrine erosional platform, yielded younger boulder ages (weighted average age = 18.9 ± 1.0 ka; oldest boulder age = 19.0 ± 1.5 ka), indicating they were deposited under the Pinto Lake level. Our new age data allow us to propose a new chronology for the Aníbal Pinto moraine complex and consolidate previously published ages from other moraine belts. We attribute the Aníbal Pinto moraine complex to early gLGM (MIS 2), emphasising that the gLGM was half ... |
author2 |
Avrasya Yer Bilimleri Enstitüsü = Eurasia Institute of Earth Sciences Istanbul (AYBE) Istanbul Technical University (ITÜ) Identité et Différenciation de l’Espace, de l’Environnement et des Sociétés (IDEES) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université Le Havre Normandie (ULH) Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire Homme et Société (IRIHS) Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU) Universidad de Magallanes (UMAG) Universidad de Buenos Aires Buenos Aires (UBA) Scottish Universities Environmental Research Centre (SUERC) University of Glasgow-University of Edinburgh (Edin.) |
format |
Article in Journal/Newspaper |
author |
Çiner, Attila Sarıkaya, Mehmet, Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek |
author_facet |
Çiner, Attila Sarıkaya, Mehmet, Akif Yıldırım, Cengiz Girault, Igor Todisco, Dominique Martin, Fabiana Borrero, Luis Fabel, Derek |
author_sort |
Çiner, Attila |
title |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_short |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_full |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_fullStr |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_full_unstemmed |
Terrestrial cosmogenic 10Be dating of the Última Esperanza ice lobe moraines (52°S, Patagonia) indicates the global Last Glacial Maximum (LGM) extent was half of the local LGM |
title_sort |
terrestrial cosmogenic 10be dating of the última esperanza ice lobe moraines (52°s, patagonia) indicates the global last glacial maximum (lgm) extent was half of the local lgm |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04492946 |
long_lat |
ENVELOPE(-70.533,-70.533,-68.767,-68.767) ENVELOPE(-56.983,-56.983,-63.400,-63.400) |
geographic |
Arauco Esperanza Patagonia |
geographic_facet |
Arauco Esperanza Patagonia |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0169-555X Geomorphology https://hal.science/hal-04492946 Geomorphology, 2022, 414, pp.108381 https://www.sciencedirect.com/science/article/pii/S0169555X22002744?via%3Dihub |
op_relation |
hal-04492946 https://hal.science/hal-04492946 |
op_rights |
http://creativecommons.org/licenses/by-nc/ |
_version_ |
1796311272792260608 |